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Silverton.pdf, „ . . � �..-U� o - � .-.. -. - ,.. _ � �. � � � � � �� , '� , �: � .. _ �' � � � � � Loc�:l�Wetla�.� In�entory`. � `pariai� �,�sess� � . : . �� :_ .. .� ;. �.� � - " � �----� a ` ,.� � � . „ � - �I = • - t � �.:" . � � � - ..._. � .. :- � � � � . �. . . � = � ..: = z� �=r .� - � -. � �_ � _ -�,.-• I� - � �� I i '� a - g � } ' � 80 p i t' ` 1 � � n� � � � � � , - �.' Prep� � �, , � � i W Sa� _ ,, � �� . � � � °� � _ � �� :The City�of�Si �' � `� �� 306 S:� Wati � > � ... � : � ; � ' , Silverton,:Or.egor � ( � PTe P� � . . ;. . - .: = - � r � . : � , , , �7ohn� � . � � � � �. - � . � . � � � . _ - � � ,: �, � � , - �. � D"a _, . . Ed Str� Pe , � - , - � m �,.m, �„� ��, �„� ggX . , _ . � . ; . � _ .; F y � � �� . � � , , �- . .. _ ,. , , , .,- ' . Shapiro and Associa�. � ., 1650.N.W: Naito Parkway, S � ' � Portlarid, Oregor - SI�APIRQ Project #79i 3 ; �, � � �� _ : �� ,<, - � � , � � _ � , .., ' _, ; " � , ., _ --- , Felirua 2 _ �'3' �s - - - i i?!Vl5��J:� U� ST�,IE ! ;;,:JS R"CEf�{'�ti� � L'.L;; i'1,.i! "'� �--� IQ: (rQ ocal etla ve to�y an 'par�an A�sess e t � . _s - f � �:. J . � i _. . � _ :� 3 . .._ _... .a. _.: . ._. . . e��:ti.vG�7:�.=:...... ...s�� i . _. .:" �4.1�..n,u... .. _.._ .. . .. . _. � � _;�.�t'i:+:x?��?��/='m .`��.�J��.1.,_.�! Prepared for The City of Silverton Prepared by pi Shapiro and Associates, Inc. � February 29, 2000 . TABLE OF CONTENTS 1.0 INTRODUCTION ......................................................................................................................1 2.0 SOURCE MA'I'ERIALS AND IVIETHODS ............................................................................ 2 21 Source Materials ...............................................................................:....................................... 2 2.2 Local Wetlands Inventory ....:................ ........................................ 2 ........................................... 2.2.1 Overview of the Local Wetlands Inventory .....:............................................................... 2 2.2:2 Overview of Loca1 Wetlands Inventory Methods ..............................................:............ 2 2.2.3 On-site Wetland Deterniination ....................................................................................... 3 2.2.4 Off-site Deterrniriation .......................:.................................................................:........... 4 2.2.5 Classification of Wetlands .....................................................................................:......... 5 2.2.6 Data Compilation and Interpretation ................................................................................ 5 2.2.7 Conf'irmation of LWI ....................................................................................................... 5 2.3 Wetland Quality Assessment ........................................................:........................................... 6 2.3.1 Overview of the Oregon Freshwater Wetland Assessment Methodology ...................... 6 2.3.2 Application of OFWAM ...................'.........>.....:............................................................... 6 2.3.3 Wetlands of Special Interest for Protection ..................................................................... 6 2.3.4 Locally Significant Wetland Assessment ........................................................................ 7 2.4 Riparian Assessment ....................:.......:................................................................................... 8 2.4.1 Overview of Riparian Assessrnent ..............................................................:.................•.- S 2.4.2 Methodology of the Riparian Guide ................................................................................ 9 2 .5 Cartographic Products ............................................................................:...............................10 3.0 PROJECT AREA CHAR.ACTERISTICS ............................................................................10 3.1 Background Information ........................................................................................................10 3.2 Setting ......................:..............................................................................................................11 33 Topography ............:................................................................................................................11 3.4 Hydrology and Drainage Basins .............................................................................................12 3.5 Soils ...........:.......................:....................................................................................................13 3.5.1 Overview ........................................................................................................................13 3.5.2 Soil Association Descriptions ........................................:....................................:......:...13 3.5.3 Hydric Soil Descriphons ................................................................................................14 3.6 Vegetation ...............................................................................................................................15 3.6.1 Historical Overview .......................................................................................................15 3.6.2 Vegetation Communities ................................................................................................15 4.0 WETLAND FINDINGS ...........................................................................................................16 4.1 Wefland Classification and Location .....................................................................................16 4.1.1 Wetland Types and Classification ..................................................................................16 41.2 Location of the Wetlands ...............................................................................................17 4.2 Oregon Freshwater Wetland Assessment Methodology Results ...........................................18 4.3 Locally Significant Wetlands ................................................................:................................18 5.0 RIPARIAN FINDTNGS ...........................................................................................................19 f' � 6 .0 SITM1VlARY ...............................................................................................................................19 '7;0 REFERENCES ....> ................................................. .......:. ......... ........: ......... ...:..... ............ 21 Appendices _ Appendix A Wetland and Riparian Inventory Section Maps Appendix B Wetland Data and Summary Sheets (organized by drainage basin and wetland code) Appendix C Riparian Data and Summary Sheets Appendix D DSL OFWAlVI Manual Appendix E` DSL Riparian Manual � List of Tables Table 1. Soil Types within the Silverton UGB ' Table 2. ' USFWS Wetland Classes Mapped by the NWI Table 3. Silverton Wetlands, Wetland Area, and USFWS Wetland Classification Table 4. � Summary of OFWAM Results for City of Silverton Table 5. Significant Wetlands and Wetlands of Special Interest for Protection Table 6. Urban Riparian Inventory and Assessment Summary � � ' � List of Figures ` . . Figure 1. Urban Crrowth Boundary and Zoning of the City of Silverton Figure 2. Location and Generalized Topography Figure 3. Drainage Basins Figure 4. Soil Mapping Units � __ Figure 5. National Wetland InventoryDesignations Figure 6. Wetlands and Intermittent Drainages Identified by the LWI � 1.0 INTRODUCTION Silverton, like other Willamette Valley communities, is being discovered as a very suitable place to live and develop businesses. As a result, the City is experiencing significant growth pressures. From 1990 to 1997, Silverton experienced a population increase of almost 17°Io. Population projections anticipate 44% growth by the year 2015. At the present time, the City of Silverton (City) does not have an updated buildable lands inventory; however, the majority of the large, undeveloped parcels available for future development are located within the City's Urban Growth Boundary (UGB, Figure 1). The UGB encompasses 2,553 acres. Wetland fill permit applications have increased in recent years, with several being considered in the near future. The City is in a period of planning review and is required to inventory Goal 5 resources within the UGB. On March 2, 1998, the City was awarded a Wetlands Planning Assistance Grant by the Oregon Division of State Lands (DSL), funded by the U.S: Environmental Protection Agency (EPA) Region X. The work described in the grant includes conducting a Local Wetlands Inventory (LWI) and a Riparian Assessment. An approved LWI will replace the U.S. Fish and Wildlife Service (USFWS) National Wetlands Inventory (NWI) maps that now provide information on where wetlands are located. The LWI will be incorporated into the statewide wetlands inventory. On May 6, 1998, the City hired Shapiro and Associates, Inc. (SHAPIRO) to conduct the study using SHAPIlZO wetland scientists experienced in conducting LWIs: Dan Cary, Colin MacLaren, John Gordon, and Dale Graff. Mr. Cary, project manager, and Mr. Graff are wetland delineators certified by the U.S. Army Corps of Engineers (COE). Sylvia Jung, a cartographer with experience mapping LWIs, produced the digitized mapping products. Field work was performed between June 3, 1998 and July 9, 1998. Th'is. report documents the methods and results of the LWI, In addition, the relative quality of the wetlands was assessed using the Oregon Freshwater Wetland Assessment Methodology (OFWAM, Roth, et al., 1996). This information was used to identify significant wetlands within the City's UGB to address Goa15 requirements for wetland protection. Riparian assessments were conducted using the Urban Riparian Inventory and Assessment Guide (Riparian Guide, Pacific Habitat Services prepared for the DSL, 1998). A brief description of the OFWAM and Riparian Guide processes are provided in Sections 2:3 and 2.4 of this document, and the summary sheets for each wetland are included in the appendices. Methods used to conduct the study are found in section 2.0; project area characteristics are descr�bed in section 3.0; wetland findings are reported in. section 4.0; and riparian findings are reported in section 5.0. Section 6.0 includes a summary of the project, and Section 7.O lists all references used. Appendix A contains wetland inventory section maps; Appendix B contains data sheets, OFWAM assessment worksheets, and results organized by watershed and wetland code; Appendix C contains riparian assessment worksheets and results; Appendix D contains a complete OFWAM guide; and Appendix E contains the Riparian Guide in its entirety. Silverton Local Wetlands Invenfory and Riparian Assessment Page -1- 2.0 Source Materials and Methods 2.1 Source Materials Available information and data were compiled and reviewed prior to field work. For example, soil mapping information was compiled from data available from the U.S. Department of Agricuiture (USDA) Soil Conservation Service (SCS, now known as the Natural Resource Conservation Service [NRCS]) county soils survey. U.S. Gealogical Survey (USGS) 7.5-minute topographic quadrangles, USFWS NWI maps, flood insurance rate maps from the U.S. Department of Housing and Urban Development Federal Insurance Administration (FIRM), City zoning maps, and taY assessor maps, also were consulted. A digitized base map of the study area was obtained that included layers for taY lot lines, street names, right-of-ways, and section boundaries. A series of recent, spring, color, aerial photographs were obtained for the study area at the scale of the base map. Other source materials included: Oregon Rivers Information System (ORIS) fish presence data base; Oregon Department of Environmental Quality (DEQ) 303(b) report {1998); Classification and Catalog of Native Wetland Plant Communities in Oregon (John Christy, 1993); and a current data search from the Oregon Natural Heritage Program (ONHP). This information was used to develop a preliminary indication of the location and possible quality of wetlands, facilitate on-site gathering of data, and complete the assessments. The City, with assistance from SHAPIRO, identified properties likely to contain wetlands. The owners of the identified properties then were sent an access permission letter. Properties to which access was granted were located on the aerial photograph and later noted on inventory maps. 2.2 Local Wetlands Inventory 2.2.1 Overview of the Local Wetlands Inventory The 1989 Oregon State Legislature authorized the DSL to develop a statewide wetlands inventory suitable for planning and regulatory purposes. Pursuant to ORS 196.674, in 1994 the DSL established LWI standards and guidelines, which are located in OAR 141-86-180 through 141-86-240. The purpose of an LWI is to locate, map, and classify wetlands by type (such as forested wetlands) over a relatively large geographic area. In accordance with LWI standards, the approximate boundaries of all wetlands at least 0.5 acre in size are identified in the inventory. No wetland boundaries were staked or flagged by SHAPIRO for this study. This LWI does include wetland delineations approved by the DSL and COE. 'These wetland delineations were confirmed within Che last ten years, but no later than the end of the field collection period. � 2.2.2 Overview of Local Wetlands Inventory Methods A LWI is conducted using color ar color infrared, aerial photographs taken within five years of the inventory initiation and at a minimum scale of 1" = 80Q' (1:9600). In general, wetlands are located using aerial photographs. Then site visits are conducted (on-site) option, as described in Silverton Local Wetlands Inventory and Riparian Assessment Page -2- the LWI standards and guidelines. In cases in which property access is denied, wetlands can be mapped off the site using other information, such as topographic maps and aerial photographs, to aid in locating wetlands. The product of an LWI is a parcel-based map showing the approximate location of wetlands at a minimum scale of 1" = 800'. The parcel-based map allows the property owner, local jurisdiction, and DSL to know which tax lots may contain wetlands. 2.2.3 On-site Wetland Determination Where groperty access permission had been granted, on-site wetland determinations were made using the Corps of Engineers Wetlands Delineation Manual, Technical Report Y-87-1 (Manual; Environmental Laboratory, 1987). The COE and DSL recognize the use of the 1987 Manual for delineation of wetlands. The Manual provides technical criteria, field indicators, and recommended procedures to be used in determining whether an area is a jurisdictional wetland, and the location of the wetland boundaries. The Manual requires that three technical criteria be met in undisturbed situations before areas can be considered wetland under federal or state jurisdiction. These criteria are the presence of hydric soils, hydrophytic vegetation, and wetland hydrolagy under narmal circumstances. If one of these criteria cannot be determined because of disturbance caused by recent natural events or hurnan activities, an alternative method must be used in making wetland determinations. Observations of soils, vegetation, and hydrology were made using a modification of the Manual's "�toutine Onsite" method. Data sites were selected to provide a valid representation of site conditions. Data were collected from representative sampling locations to justify the location of the wetland boundary. However, additional sample sites were investigated between these data points to verify changes in the three parameters, further characterize the wetland, and refine the wetland boundary. Hydrologic Assessment The Manual defines wetland hydrology as saturation within a major portion of the root zone (usually above 12 inches), typically for at least 12.5% of the growing season. The growing season for any given site or location is determined from SCS or NRCS data and information. The growing season is defined as the frost-free period recorded at the nearest recording station five years out of ten. Wetland hydrology field indicators were recorded for each excavated soil pit. Data typically recorded include depth of inundation, water table, and soil saturation. Primary indicators, such as sediment deposits, watermarks, drift lines, and drainage patterns, or secondary indicators, such as oxidized rhizospheres (root zones), also were recorded. Soils Assessment Hydric soils are those that have formed exclusively under wet conditions (soils that characteristically have t�igh water tables, are ponded or frequently flooded, or are otherwise saturated for extended periods during the growing season). The possible location of hydric areas on the site was obtained from the SCS or NRCS county soil survey. Soil pits were excavated to Silverton Local Wetlands Inventory and Riparian Assessnaent Page -3- a depth of i8 inches or more in selected locations in relation to identified potential wetland areas. Soil profiles were examined for hydric soil indicators. Soil characteristics (matrix color, mottling, texture, and other features) were recorded. Vegetation Assessment Hydrophytic vegetation consists of those plant species that have adapted to growing in substrates that are periodically deficient of oxygen because of saturated soil conditions. Species Iists of commonly encountered plants and their status have been prepared for all regions of the country by the USFWS (1988 with 1993 supplernent). The status of a particular piant is the probability of that plant occurring in a wetland. Five basic groups of vegetation are recognized in the USFWS list based on their frequency of occurrence in wetlands (Reed, 1988, 1994). These categories, referred to as the "wetland indicator status" (from the wettest to driest habitats), are as follows: obligate wetland (OBL) plants; facultative wetland (FACW) plants; facultative (FAC) plants; facultative upland (FACU) plants; and obligate upland (UPL) plants. Refer to data sheets in Appendix B for these categories. Many plants are found in transitional areas between wetlands and uplands. These areas are usually characterized by flat to gradually sloping terrain where the species composition may not reflect true wetland boundaries. In such areas, a species with a status of FACU may extend into the wetland areas, just as FACW species may be present in upland areas. A visual percent-cover estimate of the dorninant species of the plant community was performed for key sample sites. A 30-foot-radius area was investigated for dominant tree and shrub species, and a 10-foot-radius area for dominant herbaceous species, using soil pit locations as a center of reference. Dominance of plant species was determined by estimating their percent areal cover per stratum (herbaceous, shrubs, woody vines, and trees). Species from each stratum were listed together in descending order of percent cover. A determination as to predominance of hydrophytic vegetation was made using the 50-20 technique. The most abundant plant species (when ranked in descending order of abundance and cumulatively totaled) that, when totaled, immediately exceed 50°10 cover, plus any species comprising more than 20°Io cover, represent the dominant species (Federal Interagency Cornmittee far Wetland Delineation, 1989). If more than 50% of the dominant species included by the above criteria are FAC or wetter, the vegetation community is considered hydrophytic. FAG species are excluded and are considered non- hydrophytic vegetation. The "-" indicates plant species that prefer slightly drier conditions on average. A"+" indicates plant species that prefer slightly wetter conditions on average. 2.2.4 Off-site Determination No on-site sampling could be conducted where property access permission had been denied or not explicitly approved. Therefore, off-site determinations were made on the basis of aerial photograph inspection, all available mapped attributes (e.g., SCS soil surveys and NWI maps, confirmed determinations and delineations), and, where available, a reconnaissance from nearby public or approved vantage points. Observations from vantage points included documentation of dominant vegetative communities (forested, scrub/shrub, or emergent) and water regimes (such as ponded areas and obviously wet meadows). Approximate wetland boundaries were drawn on aerial photographs. Boundaries determined in this way may not be sufficiently accurate for state Silverton Local Wetla�uls Inventory and Riparian Assessment Page -4- and federal jurisdictional determinations because of the absence of actual on-site data. In addition, where views into properties from vantage points were not possible or otherwise restricted, and where aerial photographic and mapped information was inconclusive, some wetland areas may have been missed and were not inventoried. 2.2.5 Classification of Wetlands The Cowardin classification system was used to classify the types of wetlands inventoried (Cowardin, et al. 1979). The Cowardin system classifies wetlands according to general systems, structure, vegetation types, water regime, and other modifiers. For example, wetlands within the Silverton study area are of the palustrine and riverine classes. Palustrine combines vegetated freshwater wetlands (traditionally called marshes, swamps, bogs, fens, and wet prairies) and small, shallow, permanent, or intermittent water bodies called ponds that are less than 2 meters (6.6 feet) deep. This classification applies to emergent, scrub/shrub, and forestetl wetland areas. Wetlands dominated by grasses and other herbaceous plants are classified as PEM, Palustrine Emergent: Wetlands dominated by woody species less than 30 feet high are classified as PSS, Palustrine Scrub/Shrub. A site dominated by woody species over 30 feet high is classed as PFO, Palustrine Forested. The riverine classification is composed of wetland and aquatic habitats contained within a stream channel that is not dominated by vegetation. The NWI inventory maps also use the Cowardin ciassification system for mapped wetland habitats. 2.2.6 Data Compilation and Interpretation Data were recorded in the field and subsequently transferred to computerized standard wetland delineation data sheets. Sampling site locations were recorded on the aerial photographs. The approximate boundaries of wetlands and location of sample sites were drafted on the aerial photograph in the field. These boundaries subsequently were digitized onto the AutoCAD maps. All wetlands received a unique code to aid in their identification. The code was based on the drainage basin the wetland was located in and the number of wetlands within each basin. In general, parts of wetlands received separate codes where major roads or distinct breaks in wetland character occurred. Some wetlands were grouped and coded as one unit where they were adjacent; hydrologically linked, or similar in character, thus functioning as a unit. Wetland delineation boundaries confirmed by tha DSL were digitized from photocopies of maps in reports submitted to the DSL. In addition, mitigation areas were drawn on the maps, if their locations were known. 2.2.7 Confirmation of LWI A draft set of maps and report is provided to the DSL for its confirmation and assessment. Once the DSL has reviewed the documents, SHAPIRO will review the comments and make modifications to the draft wetland maps and report. The products are then resubmitted for final approval. The status of this report as draft or final is indicated on the report cover and maps. Silverton Local Wetlands Inventory and Riparian Assessment Page -S- 2.3 Wetland Quatity Assessment 2.3.1 Overview of the Oregon Freshwater Wetland Assessment Methodology The OFWAM was developed by an interagency committee to assess the relative quality of a wetland. The methodology is intended for use by planners, public officials, and community members for planning and educational puiposes. Completion of this rnethodology provides basic information, which is not intended for evaluation of detailed, site-specific impacts on individual wetlands: OFWAM is based on the idea that an understanding of the wetland system functions and conditions at local, state, and federal levels is necessary to make management decisions. Recommended uses of OFWAM include collection of basic information about wetlands in an assessment area, creation of a database of functions and conditions and other wetland data, support of decision making and planning within a jurisdiction, and education. OFWAM requires that the same functions and conditions be evaluated for each wetland within a study area. There are, in addition, other considerations noted in the following sections that determine the wetland's overall value. 2.3.2 Application of OFWAM OFWAM assessrnents were partially cornpleted during field work t�sing data gathered in the field. Other source materials were used to complete the assessments. The methodology provides qualitative information on the relative value of wetlands based on a series of questions related to wetland functions. The following functions are assessed: wildlife habitat, fish habitat, water quality, hydrologic control, sensitivity to impact, enhancernent potential, education, recreation, and aesthetic quality. Each function is assessed by criteria that give an indication of whether a wetland function is (1) intact, (2) affected or degraded, or (3) lost or not present OFWAM is designed to be open-ended; therefore, other functions and conditions may be added later, or some may be dropped if not important to the user. The OFWAM results and a summary�of the functions and conditions for each wetland are included in Appendix B. Additional details about assessing the functions and conditions are provided in Appendix D. 2.3.3 Wetlands of Special Interest for Protection A subset of questions within OFWAM provides a method to assess whether any wetlands within the study area should be considexed Wetlands of Special Interest for Protection (WSIP). WSIP assesses whether the wetland is currently in a management plan, is protected by regulatory rules or statutes, or is uncommon in Oregon. The presence of rare, tlireatened, or sensitive species within an area makes the wetIand a potential WSIP. An affirmative answer to any one of these questions also will place the wetland into a category for protection. This information could be used in management decisions for a site. The use of OFWAM and WSIP screening questions S'ilverton Local Wetlands Inventory and Riparian Assessment Page -6- will assist in an overall evaluation of the wetlands in the assessment area. Many of these WSIP questions are repeated in the locally significant criteria questionnaire (see next section), so the results were combined in one table (see Section 4.3). 2.3.4 Locally Significant Wetland Assessment The term "significant wetlands" has meaning in the context of Statewide Planning Goa15. Under this Goal, local governments are instructed to identify their significant resources, including wetlands, so those resources serving significant functions in the local community are given proper consideration in planning decisions. Tlie DSL established a technical advisory committee to develop the locally significant wetlands (LSW) criteria. The DSL adopted the Administrative Rules for ldentifying Significant Wetlands in January 1997 (141-86-300 through 141-86-350). The criteria rely heavily on the results of OFWAM. Only jurisdictional wetlands are assessed with the criteria. Locally Significant Wetland Criteria: A wetland is considered significant if it meets one or more of the following criteria: • Wetlands that are given the highest rank for a� of the four ecological functions addressed by OFWAM or equivalent methodology (see Appendix D for more details on the ranking): � wildlife habitat, • fish habitat, • water quality, or • hydrologic control. • Wetlands that (1) are rated either in the highest or second highest category for water quality (in OFWAM or equivalent) AND that (2) border a water quality lirnited stream, as listed by the DEQ. Dedicated stormwater detention swales are not included. • Wetlands that contain one or more uncommon wetland plant community, including those listed in the ONHI''s Classification and Catalog of Native Wetland Plant Communities in Oregon as Gl-G3 and Sl-S3. • Wetlands inhabited by any species listed by the federal ar state government as a sensitive, threatened, or endangered in Oregon (unless consultation with an appropriate agency deems the site not important for the maintenance of the species). • A wetland that is a dedicated or proposed Registered Natural Area or Area of Critical Environmental Concern, State Natural Heritage Conservation Area, Federal Research Natural Area, or Land Trust. • Wetlands specifically protected as wetland resources in a recognized federal, state, or local management plan, (e.g., fox park, refuge, or scenic river}. Silverton Local Wetlancls Inventory and Riparian Assessment Page -7- • Wetlands that rate in the highest category for fish habitat in OFWAM and are located adjacent to a stream segment that is mapped by the Oregon Department of Fish and Wildlife (ODFW) as habitat for "indigenous anadromous salmonids." The final two criteria aze at the discretion of the local government, but have direct connections to OFWAM results: • Optional Ctzterion (at discretion of local government): The wetland represents a locally unique plant community. Wetland is or contains the only representative within the UGB of a particular native plant community (listed in the ONHP's Classification and Catalog of Native Wetland Plant Cornmunities in Oregon). To be identified as a LSW, such a wetland also rnust score the highest or second highest rank for � of the four ecological functions addressed by OFWAM or equivalent methodology. • Optional Criterion (at discretion of local government): The wetland rates at the highest rank for education potential, and there is documented use for educational purposes by a school or organization. The City will be required to prepare local wetland protection ordinances to apply to locally significant wetlands. Additional wetlands may be protected based on other information, such as the results of the WSIP. Any wetlands not protected by local ordinances may still be under the jurisdiction of DSL and COE. 2.4 Riparian Assessment 2.4.1 Overview of Riparian Assessment In accordance with Goal 5, a riparian inventory and assessment was performed for limited areas within Silverton's UGB. Goa15 requires local governments to inventory and protect riparian corridors. Riparian areas are zones of transition between aquatic ecosystems and terrestrial ecosystems. Goa15 includes definitions that establish a riparian area adj acent to every river, lake, or stream, including intermittent streams with a defined channel. Human-made irrigation or drainage ditches are specifically excluded. Riparian areas can enhance water quatity, reduce erosion, moderate water temperatures and flood flows, and provide important fish and wildlife habitat. Riparian areas are particularly important for anadromous salmonids, which rely on cold, clean water and the habitat created by large woody debris. Local governments have two options that can be implemented in the protection of riparian areas. One option is to inventory and assess all riparian areas as described above, establishing the width of the riparian corridor on the basis of riparian vegetation. The inventoried sites are then analyzed to deternune their significance, and ordinances are implemented to provide appropriate protection. The other option is to implement the "safe harbors" provision. Under this plan, only riparian areas adjacent to fish-bearing water resources are included for pratection, and their width is based on the average stream flow of the water resource. Local governments may use either of these options, or some combination of them, to manage their riparian resources. Silverton Local Wetlaruls Inventory and Riparian Assessment Page -8- The riparian inventory and assessment was conducted using the methods contained in the Riparian Guide (a copy of which is found in Appendix E). The Riparian Guide is a rapid inventory and assessment method for defining the location and quality of riparian areas. It is intended as a tool to provide consistent riparian inventory results. This document provides guidance for determining the width and length of riparian areas, and for assessing their water quality, flood management, thermal regulation, and wildlife habitat functions 2.4.2 Methodology of the Riparian Guide The Riparian Guide includes a field inventory component, during which information is gathered on the width and other physical characteristics of the riparian areas. Riparian areas are assessed as left and right reaches facing downstream. Reaches of the riparian area are split where the character of the riparian area changes. The potential height of the dominant tree in the riparian area determines the width of the riparian areas assessed. Based on these field observations, the following functions of the riparian area are assessed: (1) Water quality, (2) Flood Management, (3)'Thermal Regulation, and (4) Wildlife Habitat. . In general, a riparian area receives a higher ranking when the following criteria are met: • average slope in the riparian area is less than 10°Io; • dominant vegetation cover in the riparian area is woody vegetation (trees, shrubs, vines) greater than 1 meter (3.2 feet) high; • dominant vegetation at the top of the bank or edge of the water resource is woody vegetation greater than 1 meter (3.2 feet) high; • extent of impervious surface is less than 10%; • the NRCS ranks the water erosion hazard of the dominant soil unit as low, slight, or moderate; • aspect or orientation of the riparian area allows shading of the water resource at midday during the summer; • flood prone areas (adjacent flat areas, depressions, swales, FEMA rnapped 100-year floodplain) are present beyond the top of the bank or edge of the water resource; • woody vegetation (trees, shrubs, vines) greater than 1 meter (32 feet) high are dominant in the flood prone area; • large woody debris is present within the riparian area; � stream or water resource is not constricted by human-made features (e.g., channelization, riprap, concrete wall, etc.); • water resource is bordered by a vegetated riparian area at least 30 feet wide; • more than two vegetation layers are present (e.g., canopy, mid-story, groundcover) • woody vegetation overhangs the edge of the water; • surface water is present throughout year; • more than one type of water resource (stream, wetland, lake/pond) is within or immediately adjacent to the riparian reach; • degree of development or human-caused disturbance (e.g., buildings, impervious surfaces, lawns, agriculture, trash) in the riparian area is less than 25%. Silverto�z Local Wetlands Inventory and Riparian Assessment Page -9- Where these factors are present or developing, the riparian area provides for water quality, flood management, thermal regulation of the water resource, and wildlife habitat. 2.5 Cartographic Products Wetland boundaries were drawn on aerial photographs_ Aerial photographs can have distortion at the edges, so digitized boundaries were adjusted. The inventory was mapped at a scale larger than the scale required in the LWI rules to allow for more clarity. However, at the map scale of 1" = 600' (1:7200), the width of a wetland boundary line is approximately 5 feet. Wetland field staff reviewed early draft maps and made corrections where necessary to increase the accuracy of the maps. Saxnp�e sites were identified within properties to which access was pernnitted. Ditches and other nairow linear features located on the edge of a property were occasionally drawn slightly to the side of the property line for graphic clarity. Each section map includes a small portion of the �djoining sections. The overlap allows for ease in viewing a wetland that may cross section boundaries. Using AutoCAD, a line was drawn paralleling the edge of the stream to show the width of the potential riparian area. 3.0 PROJECT AREA CHARACTERISTICS 3.1 Background Information Available information and data were compiled and reviewed before field work was conducted. Soil mapping information was compiled from data available in the SCS Sail Survey of Marion County Area, Oregon. Prelirninary wetland information was obtained from Silverton and N.E. Stayton, Oregon NWI maps. Floodplain information was obtained from Silverton and Marion County 100-year floodplain FTRM maps (U.S. Department of Housing and Urban Developrnent, 1979). Silverton and N.E. Stayton, Oregon USGS 7.5-minute topographic quadrangles; City zoning maps; and tax assessor maps also were consulted. Other source materials included: ORI5 fish presence data base; DEQ 303(b) report (1998); Classification and Catalog of Native Wetland Plant Communities in Oregon (7ohn Christy, 1993); and a current data search from the ONHP. This information was used to develop a preliminary indication of the location of wetlands, identify drainageways, highlight depressed areas, facilitate on-site gathering of data, and complete the assessments. Marion County provided a digitized base map of the study area. This map included layers for tax lot lines, street names, right-of-ways, and section boundaries. The project area base map was then plotted at a scale of 1" = 600' onto seven 11" x 17" sheets. Each sheet covers a section and small portions of surrounding sections, and includes an index map. A series of color, aerial photographs dated March 18, 1998 were obtained from Spencer B Gross, Inc. for the study area at a scale of 1" = 600' to match the scale of the base map. The aerial photographs were flown at a low elevation for another study for the City, and contact prints were provided for the LWI study. These aerial photographs were covered with clear acetate (permanently registered) to protect them during field use and as a surface for drafting wetland boundaries and sample sites. Silverton Local Wetlands Inventory and Riparian Assessment Page -10- The City, with assistance from SHAPIIZO, identified properties likely to contain wetlands. The owners of the identified properties were sent an access permission letter. Property boundaries with access permission were identified on the aerial photograph and base map. 3.2 Setting The City of Silverton is located in the Willamette Valley at the base of the Cas�ade Range foothills in Marion County, Oregon (Figure 2). It is approximately 10 miles east of Salem and 25 miles south of Portland, at the intersection of Highways 214 (Hillsboro-Silverton Highway) and 213 (Cascade Highway}. Silver Creek, which flows along the southwestern base of the Silverton Hills, runs generally northwest through the City. The City was founded in 1854 and incorporated in 1885. The 1996 census listed the City's population as 6,800. Historically, the forest products industry and agriculture have provided the economic base for the City. The boundary of the wetland inventory area corresponds with the City's UGB (Figures 1 and 2). Beginning north of the City at Highway 214 and Hobart Road, the boundary runs generally eastward approximately 200 yards north of Hobart Road to Monitor Road, with a northward extension on the eastern side of Highway 214, and another northward extension astride Quarry Avenue. Continuing south on Monitor Road, the boundary turns eastward north of Highway 213, then generally south and eastward, with numerous irregularities to intersect Silver Creek between Division Street and Mountain View Road. The boundary follows Silver Creek downstream (northwest), then crosses west to Eureka Avenue, south on Woodland Drive, and west to Cascade Highway, passing just north of Pettit Reservoir. The UGB continues north and somewhat west to the area of Pine Street and Airport Road, then north and east back to the starting point. The inventory area totals 2,553 acres. 3.3 Topography Silverton includes a variety of topographic characteristics. The northwestern part of the City is on flat or very slightly sloping land of the Willamette Valley. The southeastern part of the City, including the commercial district and much of the residential area, is in a narrow valley in a gorge between two promontories that rise abruptly on both sides of Silver Creek. Both of these features have steep escarpments from river level (250 feet, National Geodetic Vertical Datum [NGVD]) to 550 feet: The promontory on the northeastern side of the creek slopes more gradually on the sides away from the creek. The northern slope is the southern part of the Evans Creek drainage, and gradually melds into the floor of the Willamette Valley. The promontory on the southwestern side of the creek forms a broad ridge that continues southeast into the Cascade Range. On the western end, it declines gradually to the Willamette Valley floor. Silver Creek flows through the gorge between these two landforms. Bottomland in the gorge is approximately 1,000 feet wide, flat, with a gentle siope to the northwest, in the direction of the creek's flow. 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The inventory area contains all or parts of five smaller drainage sub-basins (Figure 3}. These small dra.inage basins form the basis of organization far the inventory. Basin boundaries were deterrnined by analyzing the topography of the inventory area as depicted on USGS topographic maps. Silverton Creek basin (SC), Silverton's central drainage basin, contains Silverton Creek as its main hydrologic feature. Wetlands in this basin are designated as SC-x. Silverton Creek flows through the City and joins the Pudding River approximately two miles (three river miles) west of the inventory area. Inside the inventory area, Silverton Creek is approximately 45 to 50 feet wide, and runs between one to several feet deep. The average annual flow is 208 cubic feet per second (cfs; USGS data from Oregon Water Resources Dept., based on data from 1964 to 1968 and 1971 to 1979). The streambed is composed primarily of unconsolidated silt, san�, gravel, cobbles, and boulders. In some places, bedrock is exposed. A concrete dam in the City Park, at approximately river mile 4.2, impounds water to a depth of approximately IO feet. The southeastern end of the inventory area contains a small drainage basin, estimated to be approximately 1 square mile in size. This small drainage basin includes several excavated ditches in agricultural fields and two water storage reservoirs that total appro�cimately 9.8 acres. These waters aIl accumulate in a small, unnamed, apparently interrnittent tributary of Silver Creek that is contained in a pipe for several hundred yards before discharging into the creek. This basin was included as part of the Silver Creek basin. Evans Creek basin (EC) is on the northern side of the Silver Creek basin. Evans Creek is a small waterway that flows along the northeastern and northern side of Silverton. It flows into Abiqua Creek approximately one-half mile northwest of the inventory area. This drainage basin is estimated to be approximately 2 square miles in area, and contains numerous excavated ditches in agricultural land and along streets and roads. Webb Lake, whose surface area is approximately 11.49 acres, is included in thus basin. It is formed by an earthen dam just south of Hobart Road. Wetlands in the Evans Creek basin are designated EGx. Abiqua Creek basin (AC) is north of the Evans Creek basin. Abiqua Creek is outside the inventory area, but a small section of the basin, including a wetland, is inside the boundary. This wetland is design.ated AG 1. Oregon Garden basin (OG) is on the southern side of the Silver Creek basin and conta.ins a smal� stream. This unnamed tnbutary of Silver Creek is significant becaase it passes through a portion of the Oregon Garden Project, the Robert Frost Elementary School carnpus, and other schooi district properties. The drainage basin for this stream is small, rather linear, and about 1.5 miles long. In the upper part, above the Oregon Garden Project, it contains two small ponds, both of which are formed behind earthen dams. Wetlands in this basin are designated OG-x. Silverton Local Wetlands Inventory and Riparian Assessment Page -12- I � � � �� I� �1� � �� . ..� .�� __ �� -- , ` � � � � a�' ..� �' � l�lJl �`. �, ��. �QO �'�� Q � '�;� ��-�� /�� l� - _.�j . 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O' � ' I � i� � � _' ' � � � f f � . �l ��, � \ �� tc 5i\:�: �� I i � � � { 1 � -. '»��'_ � �J 4 �� 5 + � 4 4 `�� I � �� j ,., �� ( 1 f f �, �� /// � �f. �� < � � , . �` ` � � ,} j �� t r� `I �' �' � � '4 � rp �'`��. _ � ^ � J � . — �iil � '/ . / `_ ' ' ,�� _.-�� E fF .� .� '4;,, !� !� � ,' %/� `S��' �!: d�;; �`• \...� ; �� ="�' _ Q� �� / 1 , . � 5 . ( h � 4 _. � � �l k ..� � � ,� �� ',♦ � � � ,�� 4 �� k � ( A � � - ` ' 1 c i' �. � ^ � �" i ' r• I � `*. � , t k i;� � �� j A � : C � . . f ��, � ry}fl,rF i 4. 5 y . k� y � � �'l "^ \ f � f I I 1 .� / �� 1 � �� ' ��. � � ` Y�� iy �� \ 1� �e_ I 3.�� 5 ��}�' i � � � \ � --` 1 1 J � I { " I � � � �f.i� ;.1'J' (/ 1 f ,�� !� f ,' ��.'ii � � ��t�ti ~��,�� ,,\�.� � . �\� 1 l • . � �� t �� , ��\\ x� �� t \ y .. . �(�• � ` �il�. / Brush Creek basin (BC) is on the southern edge of the Oregon Garden basin. Brush Creek is outside the inventory area, but a small portion of the basin, including a wetland fed by a small, unnamed tributary, are inside the boundary. This wetland is designated BG 1. 3.5 Soils 3.5.1 Overview Most of the soils in the study area were formed in mixed or unsorted alluvium, silty and clayey alluvium, and colluvium of volcanic origins. Alluvium is unconsolidated sediments deposited by streams. Colluvium refers to unconsolidated deposits on a slope or at the foot of a cliff, brought there by mass wasting. The term "mixed" means the soil particle sizes are generally unsorted. There are three major soil associations mapped in the study area: The Cloquato-Newberg- Chehalis association (map unit 1), the Concord-Dayton-Amity association (map unit 5), and the Nekia-Jory association (map unit 8). Twenty-nine soil types are mapped within the Silverton UGB. These soils are shown with their mapping codes in Table 1. In addition, hydric soils and soils with hydric inclusions and wet spots are also indicated in the table. Mapping units are shown in Figure 4. 3.5.2 Soil Association Descriptions The Cloquato-Newberg-Chehalis association consists of well-drained and somewhat excessively- drained silty clay loams to sandy loams that formed in mixed alluvium on nearly level bottom lands of the Willamette River and its tributaries. It is mapped in the west-central portion of the study area adjacent to Silver Creek. Cloquato soils make up about 45% of the association, Newberg soils about 25%, and Chehalis soils (not identified within the study area) about 13%. The remaining percentage is rr�ade up of Camas, McBee, and Wapato soil series, and small areas of Alluvial land. Cloquato, Newberg, and Camas soils are subject to frequent stream overflow. Soils of the association are used for pasture, hay, small grains, grass seed, fruits, vegetables, and wildlife habitat. The Concord-Dayton-Amity association consists of nearly level, poorly-drained, and somewhat poorly-drained silt loams over silty clay, clay, and silty clay loams. The soils have formed in silty and clayey alluvium located in shallow drainageways, depressions, and level areas. The association is mapped in the northern portion of the study area, where the majority of the hydric soils are located. Concord soils make up 40°Io of the association, Dayton soils about 30%, Amity soils about 20°l0, and Holcomb soils about 5%, in addition to other minor soils. The soils of this association have a perched water table; during wet periods in winter and spring, water ponds on these soils. Soils in this unit are used for pasture, small grains, hay, grass seed, and wildlife habitat. The Nekia-Jory association consists of well-drained silty clay loams over clay on Z to 50% slopes. The old soils of this association are reddish-brown in color, having formed in colluvium from volcanic basalt and tuffs. The association is mapped in the east-central and southeastem portion of the study area. The Nekia soils comprise about 65% of the association. Jory soils Silverton Loeal Wetlands Inventory and Riparian Assessment Page -13- Table 1. Soil Types within the 5ilverton UGB Soil Type Code Hydric* Drainage Class Erosion Hazard Abi ua silty clay loam AbA No� Well-drained Sli ht Amity silt loam Am No� Somewhat poorly- �None or slight drained � Sornewhat poorly- Clackamas gravelly loam Ck No drained Slight Cia uato silt loam Cm No W ell-drained 5liaht to moderate Concord silt loam Co Yes Poorl -drained Sli t Da ton silt loam Da Yes Poorl -drained Sli ht Moderately well-drained McAlpin silty clay loam MaA No� & samewhat poorly- None or slight draineti McBee silcv cla loam Mb No� Moderatel well-drained Moderate Nekia silty clay loam, 2 to 7% NeB No Well-drained Slight slo s Nekia silty clay loam, 7 to 12% Z NeC No WeII-drained Moderate slo es Nekia silty clay loam, 12 to 20% NeD 1Vo Well-drained Moderate slo es Nekia silty clay loam, 20 to 30% NeE No Well-drained Severe slo es Nekia silty clay loam, 30 to 50% NeF No Well-drained Severe slo es Nekia stony silty clay loam NkC No Weli-drained Moderate Nekia very stony silty clay loam, 2 to 30% slo es NsE No Well-drained SIight to moderate Nekia very stony silty clay loam, 30 to 50% slo es NsF No Well-drained Severe Newberg fine sandy loam Nu No Somewhat excessively Moderate drained Newberg silt loam Nw No Somewhat excessively Moderate drained Salem ravell silt loam Sa No Well-drained None Silverton silt loam, 2 to 12% slo s SuC No Well-drained S1iQht Sitverton sitt loam, 12 to 20%a slo es SuD No Well-drained Moderate Sta ton silt loam SvB No Well-drained Moderate Tenace esc ments Te No Not listed Not listed Waldo silt cla loam Wa Yes Poorl -drained None Wa ato silt cla loam Wc Yes Poorl -drained None or sli�ht Witzal v�r ston silt loam WtE No Well-drained Moderate to hi h Woodburn silt loam, 0 to 3% slo s WuA No� Moderatel well-drained Slieht to moderate Woodburn silt loam, 3 to 12% WuC No Maderately we]]-drained Moderate slo s *Notes: 1- may have inclusions of hydric soils; 2- may contain wet spots Source: USDA SCS, 1972 (Soil Survey of Marion Coun[y, Oregon); USDA SCS, 1989 (Hydric Soils of Oregon by County) make up about 20%, but are not mapped within the study area. The remainder of the association is made up of areas of Stony rock land, Salkum, Abiqua, Waldo, Stayton, Silverton, Santiam, and Witzel soils. Soils of this unit are used mainly for woodland, small grains, orchards, pasture, hay, and grass seed. 3.5.3 Hydric Soil Descriptions Hydric soils and soils with hydric inclusions and wet spots are indicated in Table 1 and are color coded in Figure 4. The following are descriptions of hydric soils found within the study area. Concord silt loam consists of poorly-drained soils that have formed in alluvium of mixed mineralogy. These soils are on broad valley terraces, in slightly concave depressions, and in drainageways. The surface layer is typically very dark grayish-brown (lOYR 3/2) silt loam about 6 inches thick. The subsurface is dark gray silt loam and heavy silt laam (lOYR 4/1) about 3 inches thick. The subsoil is heavy silt loam (lOYR 4/1) and light silty clay (lOYR 5/1) and is about 10 inches thick. The soil is classified as fine, montmorillonitic, mesic. Permeability is slow. Courtney gravelly silty clay loam consists of poorly-drained soils found on gravelly alluvial terraces, in shallow depressions, and in narrow drainageways. These soils formed in alluvial deposits of varying ages. A representative profile of this series includes a black (lOYR 2/1} gravelly silty clay loam surface layer about 4 inches thick; a very dark gray (7.SYR 3/0) gravelly silty clay loam subsurface layer about 8 inches thick; and a dark gray (lOYR 4/1) gravelly clay subsoil layer about 12 inches thick. The soil is classified as fine, montmorillonitic, noncalcareous, mesic. Permeability is very slow. Dayton silt loam, 0-2% slopes, consists of poorly-drained soils that have formed in old mixed alluvium, with possible influence from loess deposition. The soils are found on terraces, where they occupy areas in drainageways and depressions. In a typical profile, the surface layer is very dark grayish brown (lOYR 3/2) silt loam abaut 7 inches thick. The subsurface layer is dark gray (lOYR 4/1) silt loam about 6 inches thick. The subsoil is about 33 inches thick consisting of dark gray (lOYR 4/1) clay and grayish brown (lOYR 5/2) clay. The soil is classified as fine, montmorillonitic, mesic. Permeability is very slow. Waldo silty clay loam consists of poorly-drained soiis that have formed in alluvium on nearly level strips along streams and drainageways of the Saiem, Waldo, and Silverton Hills. The surface layer is very dark grayish brown (lOYR 3/2) silty clay loam about 7 inches thick. The subsoil layer, 36 inches thick, is very dark grayish brown (lOYR 3/2) silty clay loam in the upper part, dark gray (N 4/0) clay in the middle part, and gray (N 5/0) silty clay in the lower part. The soil is classified as fine, mixed noncalcareous, mesic. Permeability is slow. Wapato silty clay loam consists of poorly-drained soils occurring in depressions and overflow channels on flood plains formed in mixed alluvium. In a typical profile, the surface layer is very dark brown (lOYR 2/2} silty clay loam about 16 inches thick. The subsoil is very dark grayish brown (lOYR 3/2) silty clay loam about 20 inches thicl�. The soil is classified as fine-silty, mixed, noncalcareous, mesic. Permeability is moderately slow. 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R3u 81�� °' � .�.. , � �� ;,: / . -. �,. `� - - � � .:r�� • � : s / � � . ; ( 3 f ; ,� p �•• • ,, � .�� 6tr' J , I ��. . `\✓', .'% �\ � y r f l � �• . � ! �''d � ��e �F { �� Y r ��,+� - y � L` C /S( .i� / , 1 • 11 Fl � ..<�`` � � . 1� \ �✓,y� s �'r�t� ,lt .. � _�-�� ■ r�vl"1�� M �` . � 1�� {i� ;, � �L i4 � �� \` ��'��' �7V N /� .`�Y.�-..�, f Pt1 � �- , t *� ,j ; .. � , BH�� A � /� �� 4 - � '+�� i ir '�� o G w�= " � � r i �� ` � � � ,: �� i *�M� / '� ��' y � � �� `\ '�' . � � 1 ��" - � ��'' �. � , \�� ( � . ti � � �, ♦ J� . '.r I E � � �'w� � r �' J�� '�.,. f � 1 , r !:"��' ^� f.• , ' .�---.:' l'... .'.s�' _.�.�F.: ..�s.x .\'tr ,. • . J:•� . .��;' . `� �7 �`- ` ;,,5y. .:'s7�kt', �t. .��. ._ . ,... � r 3.6 Vegetation 3.6.1 HistoricalOverview Silverton is located in the Willamette Valley unit of the Interior Valley zone of Western Oregon (Franklin and Dyrness, 1973). This zone is the warmest and driest region west of the Cascade Range, because of its position in the rain shadow of the Caast Range. The Willamette Valley has been oecupied by Euroamericans since the early 19�' century. Since that time, the natural vegetation has been subject to extensive human modification. According to Franklin and Dyrness, four major vegetation communities probably existed in the Silverton area before the City was founded: oak woociland, coniferous farest, grassland, and riparian communities. Remnants of oak woodland, coniferous forest, and riparian community types still exist in the inventory area. An important subset of the riparian community type is wetland vegetation. While not addressed speci�cally by Franklin and Dyrness, it is included below because of its significance in the present work. 3.6.2 Vegetation Communities Oak Woodland Oak woodland is dominated by Oregon white oak (Quercus garryana). Other tree species sometimes present are Douglas-fir (Pseudotsuga menziesii) and bigleaf maple (Acer macrophyllum). A typical example of remnant oak woodland in Silverton is a portion of the Oregon Garden site and land east of the Oregon Garden site. Coniferous Forest Douglas-fir is the dominant tree in the coniferous forest community. Grand fir (Abies grandis) and bigleaf maple are common minor constituents of this community. The fir trees on the steep slopes on both sides of Silver Creek are sirnilar to this community type. Grassland Franklin and Dyrness published figures showing that grasslands were probably a very minor constituent of the vegetation in the Silverton area at the middle of the 19 century. Further, all grasslands in the Willamette Valley are considered to have been modified by human activities, some of which occurred before Euroamerican settlement. At the present time, the closest approximation to grassland in the inventory area is pasture land, mowed fields, and open areas that support predominantly herbaceous vegetation. Silverton Local Wetlands Inventory and Riparian Assessrnent Page -1 S- Riparian Riparian cornmunities were dominated by black cottonwood (Populus balsamifera) and Oregon ash (Fraxinus latifolia). Various willow (Salix) species were common in this association. Cottonwood and ash woodlands are still found in Silverton. Remnant trees of this type are found along Silver Creek in the southeastern and northwestern parts of the City. Wetland Vegetation in Silverton's wetlands is diverse, varying from grasses and other herbaceous plants to trees. A common grass in unmaintained sites is reed canarygrass (Phalaris arundinacea), which is found in and along many of the stream channels and drainage ditches. Broadleaf cattail (Typha latifolia) is also found in these areas, if the duration of wet conditions is long enough. These two species are quite common in wetland areas of the Evans Creek basin. Yellow monkeyflower (Mimulus guttatus) �ows profusely in the wetlands upstream from the Oregon Garden Project. Nearly all of the wetlands in Silverton are PEM (refer to Section 2.2.5, which explains the Cowardin classification). In Silverton, the palustrine scrub/shrub (PSS) and forest (PFO) are often found intermingled. Major scrub/shrub species include Pacific willow (Salix lasiandra}, Scouler willow (S. scouleriana), Sitka willow (S. sitchensis), and Douglas' hawthorn (Crataegus douglasii). Wetland trees are limited to Oregon ash and black cottonwood. Wetlands on the southwestern edge of the inventory area, on the campus of Robert Frost Elementary School, are examples of scrub/shrub and forested wetland. 4.0 WETLAND FINDINGS 4.1 Wetland Classification and Location 4,1.1 Wetland Types and Classification The USFWS, as part of the NWI program, has mapped wetland in the study area (Figure 5). The NWI maps are generated primarily on the basis of interpretation of relatively small-scale, colar infrared, aerial photographs (for example, scale of 1" = 4,833' [1:58000]) with limited ground reconnaissance conducted to con�rm the interpretations. Cowardin classifications of wetlands identified by the NWI are found in Table 2. A number of wetland areas identified through the LWI within the Silverton study area were not mapped by the NWI program. The palustrine system encampasses the greatest extent of wetlands in the study area. The largest areas of palustrine wetlands occur in association with the drainages and relatively flat areas in the northern portion of the study area mapped as hydric soils. Perennial and intermittent drainages, such as Silver Creek and Evans Creek, are in this system. 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U.S. Fish and Wildlife Wetland Classes Mapped by the NWI within the Silverton UGB Source: Cowardin, et al., 1979 Wetlands that are not distinct drainage channels, for example, in agricultural fields or undeveloped open azeas make up the majority of wetland acreage mapped in the inventory. These wetlands are vegetated by grasses and other non-woody, low-growing plants. These wetlands may experience flooding during the winter months by ponding, or other inundation by surface water. They may be saturated for all or only a part of the growing season, depending on their proximity to a water source. These wetlands are classified as palustrine emergent (PEN� wetlands. Vegetated creeks, vegetated excavated ditches, or other distinct vegetated drainage channels make up the second largest category of mapped wetlands. The length of time during which Euroamericans have settled in the Silverton area has resulted in a high degree of modification to the natural drainage of the area. Evans Creek has been excavated and realigned. Numerous drainage ditches have been excavated to modify the drainage in the area, particularly on the northern side of the City. Many of these drainage channels were excavated in hydric soils, hold water long enough, and have been unmaintained for a sufficient period that hydrophytic (wetland) vegetation has become established in them. These wetlands also are classified as palustrine emergent (PEM) wetlands. Areas adjacent to creeks, ditches, or other water resources that support growths of willows and other shrubby hydrophytes comprise the third category of mapped wetlands. These wetlands are generally found in association with surface water. 'They are classified as palustrine scrub/shrub (PSS) wetlands. The inventory area includes six ponds with unvegetated, open water. These ponds are classified as palustrine open water (POW) wetlands. 4.1.2 Location of the Wetlands Few wetland areas were mapped by NWI within the urbanized areas of Silverton (see Figure 5). This is likely because most wetlands in the project area are associated with drainages and the drainages are filled, drained, or placed in culverts through the most develaped portions of the City. Also, smaller wetlands are not readily identifiable at the scale of mapping used in the lvwz. Figure 6 illustrates the 20 wetland areas identified by the LWI. Table 3 lists each wetland with its area, and summarizes the wetland classification. Total wetland acreage is approximately 54.12 acres. Most of the wetlands mapped in the inventory area are in the Evans Creek basin, one of the five small drainage areas described in section 3.4. One small wetland of approximately 0.15 acre (wetland code BC-1) is located within the Brush Creek drainage, in the southwestern corner of the study area. This hillside seep has been excavated, and a small dam forms a tiny ponded area. This wetland is less than 1% of the wetlands in the inventory area. Wetlands associated with the Oregon Garden drainage (wetland codes OG-1, OG-2, and OG-3) on the southern side of the inventory area tota16.5 acres, or 12°Io of the wetlands in the inventory area. This wetland system includes two small ponds and other wetlands in close proximity to the stream. Silverton Local Wetlands Inventory and Riparia�a Assess�nent Page -17- Table 3. Silverton Wetlands, Wetland Area, and USFWS Wetland Classification Wetland Drainage Significant USFWS Wetland Classification Total Code Basin Wetland Area PEM PFO ' PSS ' POW (acres) AC-1 Abi ua Cr. No 0.19 0.19 BG1 Brush Cr. No 0.15 015 EC-1 Evans Cr. No 2.88 Z.gg EC-2 Evans Cr. No 0.50 0.50 EC-3 Evans Cr. Yes 0.10 11.49 11.59 EC-4 Evans Cr. Yes 6.32 0.11 6.43 EC-5 Evans Cr. No 1.03 1.03 EC-6 Evans Cr. Yes 0.84 0.90 1.74 EC-7 Evans Cr. No 0.04 0.04 EC-8 Evans Cr. No 0.24 0.24 EC-9 Evans Cr. Yes 9.89 1.92 0.51 12.32 OGl Silver Cr. Yes 0.20 0.62 0.82 OG-2 5ilver Cr. No 0.12 0.12 OG3 Silver Cr. Yes 4.96 0.60 5.56 SC-1 Silver Cr. No 0.19 0.19 SC-2 Silver Cr. No 0.94 0.94 SC-3 Silver Cr. Yes 1.23 0:59 1.82 SC-4 Silver Cr. Yes 0.01 2.07 2.08 SC-5 Silver Cr. No 4.57 4.57 SC-6 Silver Cr. No 0.91 0.91 TCITAI,S ! 3�.1� 1.Q� : 3.44 1�.5 54.12 * Wetland type according to wetland designations and the classification system developed by the USFWS and included in "Classification of Wetlands and Deepwater Habitats of the United States" (Cowardin et al., 1979). PEM=Palustrine emergent, PFO=palustrine forested, PSS= palustrine shrub/scrub, POW=Palustrine open water. These wetlands form ari almost continuous strip in the steeper, upper portions of the drainage. The drainage opens onto flatter ground at the upper end of the Oregon Garden Project. The stream then crosses the Cascade Highway and flows through agricultural fields in excavated and realigned channels. Be�ore leaving the inventory area, the creek channel returns to a more natural state, with meanders and side channels and significant woody vegetation adjacent to it. The Evans Creek basin on the northern side of the inventory area has wetlands that tata136.8 acres, including Webb Lake. This is 68% of the wetlands in the inventory area. Most of the wetlands in this basin are in the undeveloped portion of Silverton Industrial Park. The remainder are predominantly modified creek channels and excavated drainage ditches. � The basin on the southeastem corner of the inventory area includes two ponds, wetlands in agricultural fields, and an assortment of excavated ditches that combine for a total of 9.38 acres of wetlands, 17%0 of the total wetlands in the inventory area. Wetland SC-2 was mapped as an isolated hydrologic feature. It is a small, constructed pond on top of the hill in the southeastern part of Silverton. The pond water drains through a pipe and eventually into Silver Creek. The total area of this wetland is 0.94 acre, or 2°10 of the mapped total. One small, agricultural wetland (wetland code AC-1) was located in the Abiqua Creek drainage in the northwestern corner of the inventory area. This wetland is located north of the new Silverton High School, and is approximately 0.19 acre in size (less than 1°Io of the total wetlands mapped). 4.2 Oregon Freshwater Wetland Assessment Methodology Results Results of the OFWAM are summarized in Table 4. The functional level of each assessed characteristic for each wetland is shown. These functionallevels are derived directly from the assessment summary forms. Detailed responses used to generate the summary results are available on the data forms for each wetland. Data forms for each wetland are provided in Appendix B. This table is useful primarily for obtaining an overview of the current and potential functionai status of each wetland. More detaiied infortnation (individual OFWAM data sheets) should be consulted before making decisions regarding any wetland. 4.3 Locally Significant Wetlands Five wetlands mapped within the inventory area met the locally significant wetland criteria (Table �). Four wetlands met the criteria by scoring the highest rank on the wildlife habitat assessment (provides diverse wildlife habitat). These wetlands are: EC-3 (Webb Lake); OG-3 (wetlands within and around Oregon Garden); and SC-3 and SC-4 (two excavated ponds located at the eastern end of the inventory area). EC-6 (wetlands in the junction of the railroad in the northwestern portion of the inventory area) scored the highest�rank for hydrologic control function. Silverton Local Wetlands Inventory and Riparian Assessment Page, -I8- � � � � � � 0 � � .� V L � .y � 4� � .� � Q � � 0 � O O zs 0 s � a� � � V " N �? Q3 4) N N f17 a? N � Q? � tU N fy v � N � I � � � � A1 � ( + � + �[ iJ � /{{ � /}� i rt r .1 I - p � S + /� � Y �� +/�� /� � , i /{ d � Y � y + / � r �i + / � { r � �V � ( y � tL �4 � `�7 , v ,u 1L/ `V �W 1U `�7 4V �V \V 1V �L 4V yv L L L L L f... L L L. t� L � � t� L L L. L. � •� � Q} Q� � Q� � � � � � � � � Q� Q� � � � a ' ++ "� Z3 '0 T3 `D 'O "0 `C3 T3 "0 "� � T3 � 'C7 � 'a "a E'� � O O O O O O 0 O O O U O O O O O O C � � � � � � � � � 2 � � L � 2 � � L d � � a1 �? C� m L7� a} � Cn �3 C31 C � � C � C C C = C C . .� . .� . .� .� .� .� .� •� .� � tiS N cti � � � t� � � � tt3 c� (� �6 (� ti5 V(� � N N N C p� C � � � {U � a1 � N N iN � �'' " � a � � � c � � d. � fL � fL LL � [L 0.. � � r� N A A A cU � Q? N �, � � � A 3� a �+ A �+ � � � � a� a� n� a a� a a� a a� a a� a� a� a� a� a� � � � � � � � � � � � � �� +� cQ N l� � � +� � R3 +� N +� N c[3 N N c� N p � �... L O O O � O � p s.. s.. �. L �... 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W C C C G � C C C C � — — C 3 LL {I'l � G cv u -- � •� � � � � a -� � � � � - o - o - v - v -� - v - v .,, N d� Q) N � � � .� Q} N N N (U � iv � N tU p -- ,a -�.. .� � �. v � v �. .� � � �. � .� }. � a-. W O � � c� t� v t� v � c� U U � t� � � � .�,� O � (� (� ([3 (II c� � i� � (� R3 {D (0 CO CO N {t1 (� (0 �,a � a a a Q a c a c a � a a ci a a � o. a. � ', e E E � E � — E �' � � E E E � � E � � N � � .... ^. � .^ � — — — — — ._ _. _. .� � _. � � � � 4 a � � LL, LL � v � � t� �a � - o � �, � � � � Q L � m � N +� N .�...r Q� N +� N }• � N N N � � .� .�. +� N +� w L} .w V +,.+ +-� V +� U +� r � U U N U U U U U U N t� U C) N � = c� c� L co m � ro � so m � c� � �- L c� c� � � � � o- a � c a c a. a c a � � a- a a 4 a _ _ o E � — E � � � �" � � o o � � o z z z z Table 5. Significant Wetlands and Wetlands of Special Interest for Protection Wetland Results of Local WetIand Significance Results of Wetlands of Code Assessment Special Interest for Protection Assessment EG3 • Scored the highest rank (OFWAlVn for Wildlife Habitat function EC-4iEC-9 • Scored the highest rank (OFWAM) for Water Quality • Scored the highest rank (OFWAM) for H drolo ic Control function EC-6 • Scored the highest rank (OFWAM) for Water Quality • Scored the highest rank (OFWAM) for H drolo ic Control function OG-1 • Scored the highest rank (OFWAM) for Fish Habitat function • Scored the highest rank (OFWAM) for Water Quality OG-3 • Scored the highest rank (OFWANn for • Oregon Garden Wildlife Habitat function • Scored the highest rank (OFWAM) for Water Quality • Wetland is specifically protected as a wetland resource in a recognized federal, state, or local management plan, e.g., for a park, refu e, or scenic river SC-3 . Scored the highest rank (OFWAM) for Wildlife Habitat function SG-4 • Scored the highest rank (OFWAM) for Wildlife Habitat function 5.0 RIPARIAN FINDINGS The riparian inventory and assessment was conducted on the main stem of Silver Creek, using the procedures in the Riparian Guide. The riparian areas on each side of Silver Creek were segmented into reaches based on various characteristics, such as the type of development (or lack thereo� adjacent to the stream and the type of tree dominating the area. Each segment or riparian reach was coded as to the side of the stream (looking downstream; right side [R] and left side [L]) and its sequential number, with number 1 being the most upstream. 'The right side of the stream was divided into nine reaches, the left side into five. The longest reach was approximately 3,600 feet long. The width of each reach was determined by the potential height of the dominant tree species growing in it. Five tree species dominated portions of the riparian area. The species and their potential heights (which are also the width of the riparian area according to this assessment method) are Douglas-fir (120 feet), black cottonwood (120 feet), bigleaf maple (90 feet), red alder (65 feet), and Oregon white oak (60 feet). The assigned widths of the reaches varied, therefore, from 60 feet to 120 feet, depending on the dominant tree species. Actual riparian widths varied from 0 to 120 feet, and were narrowest in the downtown area. A broad variation in the width and quality of the riparian reaches was recorded during the riparian assessment (Table 6 summarizes the assessment findings). This variation is not surprising because of the extensive historical alteration of the stream comdor from various urban encroachments. The character of the reaches ranges from those that are covered completely with impermeable surface (such as downtown Silverton) to those that are almost completely undeveloped and retain significant natural characteristics (such as the reach upstream from the park, on the left bank). 6.0 SUNIlVIARY Silverton's Goa15 wetland resource inventory has been completed in compliance with guidance from the DSL that governs Loca1 Wetland Inventories. The resulting xnaps are more complete and of greater resolution and accuracy than the NWI maps that were previously used by the City to determine the location of possible wetlands. The inventory is a tool that can be used by the City to make informed planning decisions. Twenty wetland areas totaling 54.12 acres, were identified by the LWI. The largest single wetland is 12.32 acres. The majority (61°Io) of wetland acreage mapped in the inventory is palustrine emergent wetland. Most of these wetlands are not directly associated with streams, ditches, or other discrete drainages. These wetlands are vegetated by grasses and other non-woody, low-growing plants. Many of these wetlands may experience some degree of inundation during the winter and early part of the growing season. Streams, ditches, or other discrete drainages that supgort wetland plants make up the second largest category of mapped palustrine emergent wetlands. Silverton Local Wetlands Inventory a�ul Riparian Assessment Page -19- Table 6. Urban Riparian Inventory and Assessmen� Summary Potential Actual Length Water Flood. Thermal Wildlife Reach Tree Riparian of Quality ; Management Regulation -- Habitat Cod� Height Width Reach Function'' Function Function ' F�nction' (ft) ' (ft) ' (ft) ;, SC-R-1 120 120 1,050 Med Hi h Hi h Hi h SC-R-2 80 0 1,200 Low Low Low Low SC-R-3 120 0 2,500 Med Low High Med SC-R-4 90 90 3,600 Low Low Low Low 5C-R-5 70 70 3,000 Med Low Hi h Med SC-R-6 90 50 1,575 Med Low Hi h Med SC-R-7 N/A 0 1,690 High Low High High SC-R-8 60 0 1,200 Med Low Low Low SC-R-9 120 120 1,000+ Hi h Hi h Med Hi h SC-L-1 90 0 3,300 Low Low Low Low SC-L-2 120 120 400 Low Low Low Low SC-L-3 60 60 3,000 Med Low Hi h Hi h SC-L-4 65 65 2,400 Med Low Hi h Hi h SC-L-S 120 120 1,875 Med Low Hi h Hi h Palustrine scrublshrub and forested wetlands comprise the third category of mapped wetlands. These wetlands generally are found in association with surface water that supports willows, hawthorn, ash, and cottonwood. The inventory also includes six ponds with unvegetated open water. These ponds are classified as palustrine open water (POW) wetlands. Five wetlands were determined to be locally significant. Four wetlands are significant because they may provide diverse wildlife habitat. One wetland may provide significant hydrologic control in a small part of the inventory area. Assessment of the riparian corridor along Silver Creek resulted in a determination of 14 riparian reaches, the longest being approximately 3,600 feet long. The width of each reach was determined by existing vegetation, and varied from 60 to 120 feet. In some reaches, actual riparian vegetation and function were almost completely gone. In other reaches, signi�cant vegetation, natural value, and function remain. Most of the wetlands and riparian areas within Silverton's UGB have been affected significantly by development, whether residential, commercial, industrial, or agricultural. The wetlands and riparian areas within the study area still serve limited but important functions associated with �sh and wildlife habitat, water quality, hydrologic control, and quality af life. Silverton Local Wetlands Inventory and Riparian Assessment _ Page -20- 7.0 REF'ERENCES Baker, M. Steven (programmer) and Brent O. Forsberg (database manager). 1994. Oregon Rivers Infonnation System. Digital database; Oregon Department of Fish and Wildlife, Portland, Oregon. Cowardin, L.M., V. Carter, F.C. Golet, and E.T. Larse. 1979. Classification of Wetlands and Deepwater Habitats of the United States. U.S. Fish and Wildlife Service, Office of Biological Services, FWS/OBS-79/31. 103pp. Federal Interagency Committee for Wetland Delineation. 1989. Federal Manual for ldentifying and Delineating Jurisdictional Wetlands. U.S. Army Corps of Engineers, U.S. Environmental Protection Agency, U.S. Fish and Wildlife Service, and U.S.D.A. Soil Conservation Service, Washington, D.C. Cooperative technical publication. 76 pp. plus appendices. Franklin, Jerry F., and C. T. Dyrness. 1973. Natural Vegetation of Oregon and Washington. U.S. Forest 5ervice General Technical Report PNW-8. Oregon Department of Environmental Quality. 1998. Oregon's 1998 section 303(d) list of water quality iimited waterbodies (public comment draft), Portland, Oregon. Pacific Habitat Services, Inc. 1998. Urban Riparian Inventory and Assessment Guide. Oregon Division of State Lands, Salem, Oregon. Reed, Porter B., Jr. 1988. National List of Plant Species That Occur in Wetlands: Northwest (Region 9). Prepared by the U.S. Fish and Wildlife Service, St. Petersburg, Florida. NERC-88/18.37. Reed, Porter B., Jr. 1993. List of Plant Species that Occur in Wetlands (Region 9): 1993 Supplement. Washington D.C. Roth, Emily, et al. 1996. Oregon Freshwater Wetland Assessment Methodology. Revised edition. Oregon Division of State Lands. U.S. Army Corps of Engineers. 1987. Corps of Engineers Wetland Delineation Manual. Environmental Laboratory. Technical Report 4-87-1. U.S. Department of Housing and Urban Development. 1979. Federal Emergency Management Agency (FEMA) National Flood Insurance Program Flood Insurance Rate Map (FIRM). Marion County, Oregon (Unincorporated Areas). Panel Number 410154 0200 B and 410154 0150 B. U.S. Fish and Wildlife Service, National Wetlands Inventory. Silverton, Oregon. 1981. CIR aerial photography, overlaid on USGS 7.5-minute quadrangle, and N.E. Stayton, Oregon. 1982. CIR aerial photography, overlaid on USGS 7.5-minute quadrangle. Silverton Local Wetlands Inventory and Riparian Assessment Page -21- U.S. Geological Survey. 1956. Silverton, Oregon, 7.5-minute quadrangle topographic map, photorevised 1985, and N.E. Stayton, Oregon 7.5-minute quadrangle topographic map, 1969. U.S.D.A. 5oi1 Conservation Service. 1972. Soil Survey of Marion County Area, Oregon. U.S.D.A. Soil Conservation Service. 1989. Oregon Hydric Soils by Counties. Silverton Local Wetlands Inventory and Riparian Assessment Page -22- I : . . .�' .' . � : . . � �, , . , . . . . `� , . .' . . : . :' � � . .. � � , : - . �� . - - . - . . . . �_.. - . , � : . Appe�l � ; ►-�� _ - _ - i ,:. - �� = � �� .� � -� .� �.� I - �VYetland and lZiparian I��entory Section 1Vlaps �. ` � �� - � _ � � I :' _ . , + � !' :` . _ ` ` ��; � ��.�� - : . �' �. . � -. �� . ._ - . . �. , � , �_ �� _ _ - � � � 0 +-� � � V 1 � � � U� � � � � � � � � � � r, � W r� � � w � � � � � � � � � � � � � � � � � � � � � W V � � r"'�'• -a�_•--�-�.f � \ � � � 1 � � 1 � I �, l �� , i _ I � � �� __-�� ( � -...- d N � . � r �� o W p � � . � ti � � � � � � � � � � � � � , b � � �, � p cU � +' � � � � 'b � � `�� ° �� , � � �o� ..� � +� �� r � . Q �r •+ f • � � � � ♦ z r I � ' b � � � � ' � `� � � w � � � � � � � � � � 'd � � � � ,� '� O G� � .� .� "+-' a � � � � � �Q � �,A .� .� � a � �' �- � �' � ,. � � U] fZ 1� � A � � � I � I � � � ii, .;.,'��. 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Q � , � ,; � o �7 _ -.� �... � �' � � d 0 � � � � � � ! -:� � � � .��5� �,, __�. - ::. �� _ _. : �� __�� /' S,�� /� _ .�,a a fi �� ' — r,"�,� - _� � � � � 0 �� w � � m � �N � e � � .� Q � � � � 0 a � 1 1 � � � N � � N �.�■.e� � a� � a� � � U � �d �� -d � o � � ��\ 1] � T W � � �� , r .,� �� ,-, � .�, 0 � �� N 0 z �� mN � l� z Q O � o � o � cs� w w 0 � �� d ? � � �, SILVERTON LOCAL WETLANDS INVENTORY - Wetland Summary Sheet - Date(s) of Field Verification: 06/11/98 Wetland Mapping Code: EC-1 a, b, c, d, e, f, g Investigator(s): DC/JG Size (acres): 2.88 Location Legai: T6S, R1 W, S26 100, 200, 300, 500, 700, 9 000, Other: North of Hobart Road, between 2nd St. and Eska 1300, 1500, 1600, 1700, 1800, 1900, 2200, 2300, 2800, 3000, Wa Y , 3.100, 3201, 3200 Basin: Evans Creek Soils: _ . Mapped Series: Am'sty silt loam, Dayton silt loam, Concord silt loam, Wapato silty clay loam Hydrology i, Hydrologic Source: Ground water, surface drainage Wetland Classification(s): PEM Dominant Vegetation Trees Shrubs Vines Herbs Alopecurus pratensis Holcus lanatus Agrostis tenuis Comments: . ` This complex of wetlands consists of drainage ditches excavated in hydric soils; small, modified stream channels; and associated palustrine emergent areas. EC-1 a consists of ditches that convey storm water and groundwater along North 2nd Street and Hobart Road, and north through agricultural land. EC-1 b is a modified stream channef that flows through a barnyard. Most of the water in the channe� is outflow from Webb Lake. EC- 1c is a modified stream channel that connects with and contributes waterto 1b. EG1d is a narrow band of palustrine emergent wetland in a grass field. During periods of heavy precipitation, this site may be connected with EC-1 e by flood water. EC-1 e is a series of ditches that collects groundwater from agricultural areas and conveys it west to EC-1 c. Vegetation on this entire wetland network is a mix of grasses and some trees, including poplar, oak, ash, and willow. Wetland Classification Godes PFO = palustrine forested PSS = palustrine scrub-shrub 12SB = riverine streambed (intermittent) PEM = palustrine emergent POW = palustrine open water RUB = riverine unconsolidated bottom SHAP/RO Project Number.• 7965096 WETLAND DETERMINATION DATA SHEET -1987 MANUAL Client/Applicant: Citv of Silverton Site: 6666 Setness Lane NE Plot: 11 T 1W R S26 S 6S� City: Silverton - County: Marion State: OR Plot Location; Topography 30' N of fence, 100" E of road, level Project #: 7965096.1 Determined by: DC/JG Date: 6/11/98 DETERMINATION: IS THIS PLOT IN A WETLAND?: yes Do Normal Circumstances exist on the site? Yes � Are Soils ❑ Vegetation ❑ Hydrology ❑ significantly disturbed? No VEG�TATIO� Dominant P4ant Species Ind. %Cover: Ind. %Cover: Herb Stratum -% total cover: 0 Shrub/Saalinq Stratum -% total cover: 0 Alopecurus pratensis FACW 50 Holcus lanatus FAC 40 Agrostis tenuis FAC 10 Woodv Vine Stratum -% total cover: 0 Tree Stratum -% total cover: 0 Percent of Dominant Species that are OBL, FACW, or FAC (excluding FAC-) 2 of 2 = 100 %(50/20 Rule) Vegetation Criterion Met? yeS SOILS' Mapped Unit Name: Amity silt loam Drainage Class: Somewhat poorly drained Taxonomy: Fine, silty, mixed, mesic AQriaquic Xeric AQriabolls FIELD SOIL CHARACTERISTICS: Horizon Depth Matrix Color Redox Abundance, Size, Color Texture, Structure. Other 0-10" lOYR 3/1 clayey silt loam 10-18" 2.SYR 4/2 frequent, fine, 7.SYR 4/4 clay loam ❑ Histosol ❑ Prob. Aquic moisture regime ❑ Redox features ❑ Organic streaking ❑ Histic epipedon ❑ Reducing conditions ❑ Concretions ❑ Organic pan ❑ Sulfidic odor ❑ Gleyed ❑ Highly organic surface layer ❑ On hydric soils list Soil Griterion Met? yes Depth of inundation N/A Depth to water table: >18" Depth to saturation: >18" Primary Indicators: Secondary fndicators (2 or more required): ❑ Inundated ❑� Oxidized rhizospheres ❑� Local soil survey data ❑ Saturated in upper 12" ❑� Water-stained leaves 0 FAC-Neutral test ❑ Water marks ❑ Recorded data (aerials, groundwater data) ❑ Drift lines Explain: ❑ Sediment deposits � Other ❑ Drainage patterns Explain: algal mats on soil surface; matted water stained leaves Hydrology Criterion Met? Yes Shapiro and Associates, Inc. 1650 N.W. Naito Parkway, Suite 302 Portland, OR 97209 (503) 274-9000 WETLAND DETERMINATION DATA SHEET -1987 MANUAL Ciient/Applicant: Citv of Silverton Site: 6666 Setness Lane NE Plot: 12 T 6S R 1W S 26 City: Silverton County: Marion State: OR Plot Location; Topography 60' N of #11, center of field, level Project #: 7965096.1 Determined by: DC/JG Date: 6/11/98 DETERMINATION: IS THIS PLOT IN A WETLAND?: No Do Normal Circumstances exist on the site? Yes Are Soils ❑ Vegetation ❑ Hydrology ❑ significantly disturbed? No VEGETATION Dominant Plant Species Ind. %Cover: Ind. %Cover: Herb Stratum -% total cover: 100 ShrublSa�linq Stratum -°!o total cover: 0 Holcus lanatus FAC 80 Alopecurus pratensis FACW 10 Festuca arundinacea FAC- 10 Woodv Vine Stratum -% total cover: 0 Tree Stratum -% total cover: 0 Percent of Dominant Species that are OBL, FACW, or FAC (excluding FAC-) 1 of 1 = 100 %(50/2Q Rule) Vegetation Criterion Met? Yes SOILS: Mapped Unit Name: Amity silt loam Drainage Class: Somewhat poorly drained Taxonomy: Fine, siltv, mixed, xeric A�riaquic Xeric Agriabolls FIELD SOIL CHARACTERISTICS: Horizon Depth Matrix Color Redox Abundance, Size, Color Texture, Structure, Other 0-13" 10 YR 3/2 fine, few 10 YR 2/2 mottles silty clay loam 13-18" 10 YR 4/2 fine, faint 10 YR 4/3 mottles clay loam ❑ Histosol ❑ Prob. Aquic moisture regime �❑ Redox features ❑ Organic streaking ❑ Histic epipedon ❑ Reducing conditions ❑ Concretions ❑ Organic pan ❑ Sulfidic odor ❑ Gleyed ❑ Highly organic surface layer ❑ On hydric soils list Soil Criterion Met? Yes` Depth of inundation N/A Depth to water table: >18" Depth to saturation: >18" Primary Indicators: Secondary Indicators (2 or more required): ❑ Inundated ❑ Oxidized rhizospheres ❑� Local soil survey data ❑ Saturated in upper 12" ❑ Water-stained leaves ❑ FAC-Neutral test ❑ Water marks ❑ Recorded data (aerials, groundwater data) ❑ Drift lines Explain: ❑ Sediment deposits ❑ Other ❑ Drainage patterns Explain: Hydralogy Criterion Met? No Shapiro and Associates, Inc. 1650 N.W. Naito Parkway, Suite 302 PortEand, OR 97209 (503) 274-9000 OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Date(s): 6/11/98 Investigator(s): DC/JG Project Name: City of Silverton WetlandCode: EC-1 ProjectNumber: 7965096 Wiidiife Habitat Q1: Q2: Q3: Q4: Q5: Q6: Q7: Q8: Q9a: Q9b: C C C C A A A B 0 Fish Habitat Streams Q1: C Q2: C Q3: C Q4: A Q5: B Q6: A Q1: A Q2: A Q3: C Q4: C Q5a: Q5b: B Q6: B Fish Habitat Lakes/Ponds Q1: Q2: Q3: Q4: Q5: Q6: Q1: Q2: Q3: Q4: Q5: Q6: B A B C A B Water Hydrologic Sensitivity to Quality Control Impact Q1: A Q1: B Q1: A Q2: A Q2: A Q2: A Q3: B Q3: C. Q3: C Q4: B Q4: B Q4: B Q5: B Q5: C Q5: B Q6: C Q6: B Q6: B Q7: B Q1: Q2: Q3: Q4: Q5: Q6: in p A Q1 C Q2 C Q3 B Q4 B Q5 B Q6 C C A B A A OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Function and Condition Summary Sheet for the Oregon Method WetlandCode: EC-1 ProjectNumber: 7965096 Funct�on Evaluation Descriptor Rationale Wildlife Habitat The wetland provides One, Cowardin wetland class with 5 or fewer habitat for some wildiife plant species. Emergent veg. or wet meadow. species. Low degree of Cowardin class interspersion. Less than 0.5 acre of unvegetated open water present. Wetland connected to another body of water by surface water. Wetland connected to other wetlands within a 3 mile radius. Upstream not listed as water quality limited. Agricultural land use within 500 feet of wetland edge. Fish Habitat - Streams The wetland's fish habitat Less than 50% of stream shaded by riparian function is impacted or vegetation. Physical character of stream degraded. channel extensively modified/piped. Stream contains less than 10% of instream structures. Upstream not listed as water quality limited. Agricultural land use within 500 ft of wetland edge. Salmon, trout, or sensitive species present sometime during the year. Fish Habitat - Lakes/Ponds N/A Water Quality The wetland's water quality Surface flow (including streams and ditches) function is impacted or is wetland's primary source of water. degraded. Evidence of flooding or ponding during part of the growing season. Moderate (approx. 60%) degree of wetland vegetation cover. Between 0.5 and 5 acres of wetland connected to other wetlands within a 3 mile radius. Agricultural land use within 500 feet of wetland edge. Upstream not listed as water quality limited in watershed or adjacent to the wetland. Hydrologic Control The wetland's hydrologic No part of wetland located within 100-year control function is impacted floodplain or enclosed basin. Evidence of or degraded. flooding or ponding during the growing , season. Area is less than 0.5 acre. Minor restrictions slow down waterflow out of the wetland. Emergent veg. or wet meadow is dominant cover type. Agricultural land use within 500 ft of wetland on downstream or down-slope edge of wetland. Agcicultural land use in watershed upstream from area. Sensitivity to lmpact The wetland is potentially Stream flow or bank has been modified by sensitive to future impacts human activities within 1 mile above wetland. Water is being taken out of stream(s) through active diking, drainage, or irrigation districts upstream. Upstream not listed as water quality limited in watershed upstream of the or adjacent to the wetland. Agricultural land use within 500 feet of wetland's edge. Dominant Agricultural land use within 500 feet of wetland's edge. Emergent veg. only or wet meadow is the dominant cover. Enhancement Potential The wetland has moderate One or more of functions for assessment potential for enhancement. results for wildlife habitat, fish habitat, water OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Function and Condition Summary Sheet for the Oregon Method WetlandCode: EC-1 ProjectNumber; 7965096 Function Evaluation Descriptor Rationale quality and hydrologic control is impacted or degraded. Wetland's primary source of water is surface flow, including streams and ditches. Water flow into wetland is restricted and cannot be restored. Wetfand's area is tess than 0.5 acre. Between 10 and 40 % of wetland's edge is bordered by a vegetative buffer 25 or more feet wide. Wetland is potentially sensitive to future impacts. Education The wetland has potential Wetland site is open to the public for direct for educational use. access or observation, but aliowed only with permission. There are no visible hazards to the public at the wetland site. Provides wildlife habitat for some species, or fish habitat is impacted or degraded, There is no existing physical public access to other features, and observation of other features cannot be made. There is a maintained public access point within 250 feet of the wetland's edge. Access is noE available for limited mobility. Recreation The wetland has the There is a maintained public access point potential to provide within 250 feet of wetland's edge. Wetland not recreational opportunities. accessible by boat-no boat launch within 1 mile/ cannot develop. No existing trails and viewing areas to guide user ar if created, would disrupt wildlife or plant habitat. Wetland provides habitat for some species. Fishing is not allowed at wetland or adjacent water body (or not applicable). Hunting is not allowed at the wetland. Aesthetic Quality The wetland is not pleasing. One Cowardin class is visible from primary viewing area(s). Less than 25% of wetland is visible from viewing area(s). General appearance of wetland has no visual detractors. Visual character with surrounding area is landscaped or manipuiated by peopie. Natural, pleasant odors are present at primary viewing location. Some traffic and other similar sounds and natural sounds are audible �'at primary viewing locations. Silverton . Wetlands of Special Interest for Protection Assessment Answer Sheet WetlandCode: EC-1 Question 1 B List: Question 2 B List: Question 3 B List: Question 4 B List: Question 5 B Question 6 B Question 7 B List: Ques4ion 8 B Question 9 B Question 10 B Shapiro and Associates, Inc., 1650 N.W. Naito Parkway, Suite 302, Portland, Oregon 97209 Project Number: 7965096 Silverton Local Wetland Significance Assessment WetlandCode: EC-1 A. "OUT" Test No Wetlands artificially CREATED ENTIRELY FROM UPLAND that are: (a) created for the purpose of controlling, storing, or maintaining stormwater; (b) active surface mining ponds; (c) ditches without free and open connection to waters of the state AND without fish; (d) <1 acre and unintentionally created from irrigation leak or construction activity; (e) of any size and created for the purpose of wastewater treatment, stock watering, settling of sediment, cooling industrial water, or as a golf course hazard. No Documented as being contaminated by hazardous substances, materials or wastes ("Hazmat sites"). This wet does NOT m eet the criteria for identification as a Local Significant Wetlan B. "I N" No Wetlands that score the highest rank for ANY of the four ecological functions addressed by OFWAM or equivalent methodology: No wildlife habitat, No fish habitat, No water quality, No hydrologic control. No Wetlands that (1) are rated in either the highest or second highest category for water quality (in OFWAM or equivalent) AND that {2) the wetland is within one-quarter mile from a water quality- limited stream as listed by DEQ. No Contains one or more rare wetland plant communities including those listed in the Oregon Natural Heritage Program's CLASS1FfCAT10N AND CATALOG OF NATIVE WETLAND P�ANT C�MMUNITIES W OREGON as G1-G3 and S1-S3. No Inhabited by any species listed by the federal or state government as a sensitive, threatened or endangered species in Oregon (unless consultation with appropriate agency deems the site not important for the maintenance of the species. No Wetland rates in either the highest or second highest category for Fish Habitat in OFWAM and is located adjacent to a stream segment that is mapped by ODFW as habitat for "Indigenous anadromous salmonids." No OPTIONAL CRITERION (at discretion of local government): Wetland represents a LOCALLY unique plant community. No OPTIONAL CRITERION (at discretion of local government): Wetland is publicly owned, rates highest rank for education potential, and there is documented use for educational purposes by a school or organization. Shapiro and Associates, Inc., 1650 N.W. Naito Parkway, Suite 302, Portland, Oregon 97215 Project Number: 7965096 SILVERTON LOCAL WETLANDS INVENTORY - Wetland S�mmary Sheet - Date(s) of Field Verification: 9/23/98 Wetland Mapping Code: AC-1 Investigator(s): JG Size (acres): 0.19 Location Legal: T6S, R1 W, S27 400 Other: New Siiverton High School campus Basin: Abiqua Creek Soils Mapped Series: Dayton silt loam, Concord silt loam Hydrology Hydrologic Source: Precipitation, surface runoff, groundwater Wetland Classification(s): PEM Dominant Vegetation : Trees Shrubs Vines . Herbs Comments:! AC-1 is the remaining wetland of three wetlands delineated by Fishman Environmental Services on the site of the new Silverton High School (DSL #97-018b). Complete information about the site is avaitable in the delineation and mitigation reports. Wetland Classification Codes: PFO = palustrine forested PSS = palustrine scrub-shrub RSB = riverine streambed (intermittent) PEM = palustrine emergent POW = palustrine open water RUB = riverine unconsolidated bottom SHAPIRO Projecf Number. 7965096 Wiidlife Fish Habitat Habitat Streams Q1: B Q1: Q2: C Q2: Q3: C Q3: Q4: C Q4: C15: B Q5: Q6: B Q6: Q7: A Q8: B Q9a: Q9b: C Q1: B Q2: C Q3: Q4: C Q5a: QSb: C Q6: B Fish Habitat Lakes/Ponds Q1: Q2: Q3: Q4: Q5: Q6: Q1: Q2: Q3: Q4: Q5: Q6: A C B C A B Water. Quality Q1: Q2: Q3: Q4: Q5: Q6: Q1: Q2: Q3: Q4: Q5: Q6: B B B C B C Hydrologic Control Q1: B Q2: B Q3: C Q4: C Q5: C Q6: B Q7: A A Q1: C Q2: C Q3: B Q4: B Q5: B Q6: C A B B A A Sensitivity to impact Q1: Q2: Q3: Q4: Q5: Q6: A A C B B B OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Function and Condition Summary Sheet for the Oregon Method WetiandCode: AC-1 ProjectNumber: 7965096 Funct�on Evaluation Descriptor Rationale Wildlife Habitat The wetland provides One Cowardin wetland class with more than 5 habitat for some wildlife piant species. Emergent veg. or wet meadow. species. Low degree of Cowardin ciass interspersion. Less than 0.5 acre of unvegetated open water present. Wetland not connected to another body of water, but water within 1 mile. Wetland not connected to other wetlands, but within 3 mile radius of other wetlands. Upstream not listed as water quality limited. Agricultural land use within 500 feet of wetland edge. Fish Habitat - Streams N/A Fish Habitat - Lakes/Ponds Water Quality N/A The wetland's water quality function is impacted or degraded. Precipitation or sheet flow is wetland's primary source of water. Unable to determine evidence of flooding or ponding during the growing season (or unapplicable). Moderate (approx. 60%) degree of wetland vegetation cover. Less than 0.5 acre and wetland is not connected to other wetland within a 3 mile radius. Agricultural land use within 500 feet of wetland edge. Upstream not listed as water quality limited in watershed or adjacent to the wetland. Hydrologic Control The wetland's hydrologic No part of wetland located within 100-year control function is impacted floodplain or enclosed basin. Unable to or degraded. determine evidence of flooding or ponding during the growing season (or not applicable). Area is less than 0.5 acre. Waterflow out of wetland is unrestricted. Emergent veg. or wet meadow is dominant cover type. Agricultural land use within 500 ft of wetland on downstream or down-slope edge of wetland. Urban or Urbanizing land use in watershed � upstream from area. Sensitivity to Impact The wetland is potentially Stream flow or bank has been modified by sensitive to future impacts human activities within 1 mile above wetland. Water is being taken out of stream(s) through active diking, drainage, or irrigation districts upstream. Upstream not listed as water quality limited in watershed upstream of the or adjacent to the wetland. Agricultural land use within 500 feet of wetland's edge. Dominant Agriculturat land use within 500 feet of wetland's edge. Emergent veg. only or wet meadow is the dominant cover. Enhancement Potential The wetland has little Wetland has lost one or more functions or enhancement potential. one or more functions is not present in assessment,results for wildlife habitat, fish ° habitat, water quality and hydrologic control. Wetland's primary source of water is precipitation or sheet flow. Wetland's area is OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Function and Condition Summary Sheet for the Oregon Method WetlandCode: AC-1 ProjectNumber: 7965096 Funct�on Evaluation Descriptor Rationale less than 0.5 acre. Less than 10% of wetland's edge is bordered by a vegetative buffer 25 or more feet wide. Wetland is potentially sensitive to future impacts. Education The wetland site is not Wetland site is open to the pubficfor direct appropriate for educational access or observation. More than two visible use. safety hazards exist at the wetland site. Provides wildlife habitat for some species, or fish habitat is impacted or degraded. There is no existing physical public access to other features, and observation of other features cannot be made. There is a maintained public access point within 250 feet of the wetland's edge. Access is not available for limited mobilitv. Recreation The wetland has the potential to provide recreational opportunities There is a maintained public access point within 250 feet of wetland's edge. Wetland not accessible by boat-no boat launch within 1 mile/ cannot develop. No existing trails and viewing areas to guide user or if created, would disrupt wildlife or plant habitat. Wetland provides habitat for some species. Fishing is not allowed at wetland or adjacent water body (or not applicable). Hunting is not allowed at the wetland. Aesthetic Quality The wetland is considered One Cowardin class is visible from primary to be moderately pleasing. viewing area(s). More than 50°/a of wetland is visible from viewing area(s). General appearance of wetland has visual detractors, which can be removed easily. Visual character with surrounding area is landscaped or manipulated by people. Natural, pleasant odors are present at primary viewing location. Some tra�c and other similar sounds and natural sounds are audible at primary viewing locations. Silverton Wetlands of Special Interest for Protection Assessment Answer Sheet WetlandCode: AC-1 Question 1 B List` Question 2 B List: Question 3 B List: Question 4 B List: Question 5 B Question 6 B Question 7 B List: Question 8 B � Question 9 B Question 10 B Shapiro and Associates, Inc., 1650 N.W. Naito Parkway, Suite 302, Portland, Oregon 97209 � Project Number: 7965096 Silverton Locat Wetland Significance Assessment WetlandCode: AC-1 A. "OUT" Test No Wetlands artificially CREATED ENTIRELY FROM UPLAND that are: (a) created for the purpose of controlling, storing, or maintaining stormwater; (b) active surface mining ponds; . (c) ditches without free and open connection to waters of the state AND without fish; (d} <1 acre and unintentionally created from irrigation leak or construction activity; (e) of any size and created for the purpose of wastewater treatment, stock watering, settling of sediment, cooling industrial water, or as a golf course hazard. No Documented as being contaminated by hazardous substances, materials or wastes ("Hazmat sites"). This wetland does NOT meet the criteria for identification as a Local Significant Wetland B. �•�N No Wetlands that score the highest rank for ANY of the four ecological functions addressed by OFWAM or equivalent methodology: No wildlife habitat, No fish habitat, No water quality, No hydrologic control. No Wetlands that (1) are rated in either the highest or second highest category for water quality (in OFWAM or equivalent) AND that (2) the wetland is within one-quarter mile from a water quality- limited stream as listed by DEQ. No Contains one or more rare wetland plant communities including those listed in the Oregon Natural Heritage Program's CLASSIFICATION AND CATALOG OF NATIVE WETLAND PLANT COMMUNITIES IN OREGON as G1-G3 and S1-S3. No Inhabited by any species listed by the federal or state government as a sensitive, threatened or endangered species in Oregon (unless cansultation with appropriate agency deems the site not important for the maintenance of the species. No Wetland rates in either the highest ar second highest category for Fish Habitat in OFWAM and is located.adjacent t� a.stream segment that is mapped by ODFW as habitat for "Indigenous anadromous salmonids." No OPTIONAL CRITERION (at discretion of local government): Wetland represents a LOCALLY unique plant community. No OPTIONAL CR{TERlON (at discretion of local government): Wetland is publicly owned, rates highest rank for education potential, and there is documented use for educational purposes by a school or organization. Shapiro and Associates, Inc., 1650 N.W. Naito Parkway, Suite 302, Portland, Oregon 97215 Project Number: 7965096 SILVERTON LOGAL WETLANDS INVENTORY - Wetland Summary Sheet - Date(s) of Field Verification: 9/23/98 Wetland Mapping Code: BC-1 Investigator(s): JG Size (acres): 0.15 Location Legal: T7S, R1 W, S3 N/A Other: Approx. 1/4 mile E of hwy, central on OG site Basin: Brush Creek Soils Mapped Series: Nekia very stony siity clay loam Hydrology ; Hydrologic Source: Groundwater; seep Wetland Classification(s): PFO Dominant Vegetation ' Trees Shrubs Vines Herbs Fraxinus latifolia Comments:: . BC-1 is a small isolated forested wetland around a seep. The site was delineated by Shapiro and Associates (DSL # 97-0223). Complete information about the site is available in the delineation report. Wetland Classification Codes: PFO = palustrine forested PSS = palustrine scrub-shrub RSB = riverine streambed (intermittent) PEM = palustrine emergent POW = palustrine open water RUB = riverine unconsolidated bottom SHAP/RO Project Number. 7965096 OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Date(s): 9/23/98 Investigator(s): JG Project Name: City of Silverton WetlandCode: BC-1 ProjectNumber: 7965096 Wiidiife Habitat Q1: Q2: Q3: Q4: Q5: Q6: Q7: Q8: Q9a: Q9b: B A C C B B A A A Fish Habitat- Fish Habitat Streams LakeslPonds Q1: Q1: Q2: Q2: Q3: Q3: Q4: Q4: Q5: Q5: Q6: Q6: Q1: B Q2: B Q3: Q4: C Q5a: Q5b: A Q6: B Q1: Q2: Q3: Q4: Q5: Q6: B A A A B B Water Qua{ity Q1: Q2: Q3: Q4: Q5: Q6: Q1: Q2: Q3: Q4: Q5: Q6: Hydrologic Control C Q1: B B Q2: B A Q3: C C Q4: C C Q5: A C Q6: C Q7: B B Q1: C Q2: C Q3: B Q4: B Q5: B Q6: C B A A A A Sensitivity to {mpact Q1: A Q2: A Q3: C . Q4: B Q5: C Q6: A OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Function and Condition Summary Sheet for the Oregon Method WetlandCode: BC-1 ProjectNumber: 7965096 Function Evaluation Descriptor Rationale Wildlife Habitat The wetland provides habitat for some wiidlife species. One Cowardin wetland class with more than 5 plant species. Woody vegetation is dominant vegetation cover. Low degree of Cowardin class interspersion. Less than 0.5 acre of unvegetated open water present. Wetland not connected to another body of water, but water within 1 mile. Wetland not connected to other wetlands, but within 3 mile radius of other wetlands. Upstream not listed as water quality limited. Exclusive Forest use or Open Space within 500 feet of wetland edge. More than 40% of wetland edge bordered by veg. buffer 25 or more feet wide. Fish Habitat - Streams N/A Fish Habitat - Lakes/Ponds N/A Water Quality The wetland's water quality Groundwater (including seeps and springs) is function is lost or not wetland's primary source of water. Unable to present. determine evidence of flooding or ponding during the growing season (or unapplicable). High (>60%) degree of wetland vegetation cover. Less than 0.5 acre and wetland is not connected to other wetland within a 3 mile radius. Exclusive Forest use or Open Space within 500 feet of wetland edge. Upstream not listed as water quality limited in watershed or adjacent to the wetland. Hydrologic Control The wetland's hydrologic No part of wetland located within 100-year control function is impacted floodplain or enclosed basin. Unable to or degraded. determine evidence of flooding or ponding during the growing season (or not applicable). Area is less than 0.5 acre. Waterflow out of wetland is unrestricted. Woody vegetation is dominant cover type. Exclusive Forest Use or Open Space within 500 ft of wetland on downstream or down-slope edge of wetland. Agricultural land use in watershed upstream from area. Sensifivity to lmpact The wetland is potentially Stream flow or bank has been modified by sensitive to future impacts human activities within 1 mile above wetland. Water is being taken out of stream(s) through active diking, drainage, or irrigation districts upstream. Upstream not listed as water - quality limited in watershed upstream of the or adjacent to the wetland. Agricultural land use within 500 feet of wetland's edge. Dominant Exclusive Forest use or Open Space. Woody vegetation is the dominant cover. Enhancement Potentia! The wetland has moderate Wetland has lost one or more functions or potential for enhancement. one or more functions is not present in assessment results for wildlife habitat, fish habitat, water quality and hydrologic control. Wetland's primary source of water is OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Function and Condition Summary Sheet for the Oregon Method WetlandCode: BC-1 ProjectNumber: 7965096 Function Evaluation Descriptor Rationale _ groundwater, including springs and seeps. Wetland's area is less than 0.5 acre. More than 40% of wetland's edge is bordered by a vegetative buffer 25 or more feet wide. Wetland is potentially sensitive to future impacts. Education The wetland has potential Wetland site is open to the public for direct for educational use. access or observation, but allowed only with permission. There are no visible hazards to the public at the wetland site. Results of wildlife habitat and fish habitat assessment criteria prove wetland provides diverse Wildlife Habitat, or Fish Habitat function is intact. There is existing physical public access to other features or it can be created easily and other habitats can be observed from this site. There is an unmaintained access point within 250 feet of the wetland's edge. Access is not available for limited mobility. Recreation The wetland has the There is an unmaintained public access point potential to provide within 250 feet of the wetland's edge. Wetland recreational opportunities. not accessibie by boat-no boat launch within 1 mile/ cannot develop. No existing trails and viewing areas to guide user or if created, would disrupt wildlife or plant habitat. Wetland provides habitat for some species. Fishing is not allowed at wetland or adjacent water body (or not applicable). Hunting is not allowed at the wetland. Aesthetic Quality The wetland is considered One Cowardin class is visible from primary to be moderately pleasing. viewing area(s). Between 25 and 50% of wetland is visible from viewing area(s}. General appearance of wetland has no visual detractors. Visual character with surrounding area is open or naturally landscaped. Natural, p{easant odoss are prese�t at primary viewing location. Some traffic and other similar sounds and natural sounds are audible at primary viewing locations. Silverton Wetlands of Special Interest for Protection Assessment. Answer Sheet WetlandCode: BC-1 Question 1 B List: Question 2 B List: Question 3 B List. Question 4 B List: Question 5 B Question 6 B Question 7 B List: Question 8 B Question 9 B Question 10 B Shapiro and Associates, Inc., 1650 N.W. Naito Parkway, Suite 302, Portland, Oregon 97209 Project Number: 7965096 Silverton Local Wetland Significance Assessment WetlandCode: BC-1 A. "OUT" Test No Wetlands artificially CREATED ENTIRELY FROM UPLAND that are: (a) created for the purpose of controlling, storing, or maintaining stormwater; (b) active surface mining ponds; (c) ditches without free and open connection to waters of the state AND without fish; (d) <1 acre and unintentionally created from irrigation leak or construction activity; (e) of any size and created for the purpose of wastewater treatment, stock watering, settling of sediment, cooling industrial water, or as a golf course hazard. No Documented as being contaminated by hazardous substances, materials or wastes ("Hazmat sites"). This wetland does NOT meet the criteria for identification as a Local Significant Wetland B. ••�N No Wetlands that score the highest rank for ANY of the four ecological functions addressed by OFWAM or equivalent methodology: No wildlife habitat, No fish habitat, No water quality, No hydrologic control. No Wetlands that (1) are rated in either the highest or second highest category for water quality (in OFWAM or equivalent) AND that (2} the wetland is within one-quarter mile fram a water quality- limited stream as listed by DEQ. No Contains one or more rare wetland plant communities including those listed in the Oregon Natural Heritage Program's CLASSIFICATION AND CATALOG OF NATIVE WETLAND PLANT. COMMUNITIES IN OREGON as G1-G3 and S1-S3. No Inhabited by any species listed by the federal or state government as a sensitive, threatened or endangered species in Oregon (unless consultation with appropriate agency deems the site not important for the maintenance of the species. No Wetland rates in either the highest or second highest category for Fish Hab+tat in OFWAM and is located adjacent to a stream segment that is mapped by ODFW as habitat for "Indigenous anadromous salmonids." No OPTIONAL CRtTERION (at discretion of local government): Wetland represents a LOCALLY unique plant community. No OPTlONAL CRITERfON (at discretion of local government): Wetland is publicly owned, rates highest rank for education potential, and there is documented use for educational purposes by a school or organization. Shapiro and Associates, Inc., 1650 N.W. Naito Parkway, Suite 302, Portland, Oregon 97215 Project Number: 7965096 SILVERTON LOCAL WETLANDS INVENTORY - Wetland Summary Sheet - , Date(s) of Field Verification: 06/11/98 Wetland Mapping Code: EC-2 Investigator(s): DC/JG Size (acres): 0.5 Location Legal: T6 S, R1 W, S26 Oti�er: 503/509 Lincoln Street Basin: Evans Creek 1400, 1500, 2200 Soils Mapped Series: Concord silt loam, Wapato silty clay loam Hydrology Hydrologic Source: Precipitation; surface flow Wetland Classification(s): PEM, PFO Dominant Vegetat`ron Trees Fraxinus latifolia Populus balsamifera Shrubs Vines Herbs Alopecurus pratensis Holcus lanatus Phalaris arundinacea Agrosfis tenuis Mentha arvensis Gomments: This wetland is in the back yard of a residentia! lot. The site is essentially a flat pasture, with minor depressions and elevated areas. The highest part of the lot is a mound of fill material that supports upland vegetation. Residents in the neighborhood indicate that the area floods seasonally, and during periods of high precipitation is connected by surface water to a system of ditches in the neighborhood. Trees are located along the southern edge of the wetland. Wetland Classification Codes: PFO = palustrine forested PSS = palustrine scrub-shrub RSB = riverine streambed (intermittent) PEM = palustrine emergent POW = palustrine open water RUB = riverine unconsolidated bottom SHAP/RO Project Number.• 7965096 WETLAND DETERMINATION DATA SHEET -1987 MANUAL Client/Applicant: Citv �f Silverton Site: 503/509 Lincoln St. Plot: 8 T� R 1W S 26 City: Silverton - County: Marion State: OR Plot Location; Topography Central in back field- 100'sds of back fence. 60' E of W fence, on raised fill. Project #: 7965096.1 Determined by: DC/JG Date: 6/11/98 DETERMINATION: IS THIS PLOT IN A WETLAND?: No Do Normal Circumstances exist on the site? Yes Are Soils ❑ Vegetation ❑ Hydrology ❑ significantly disturbed? No VEGETATION� Dominant Plant Species Ind. %Cover: Ind. %Cover: Herb Stratum -% total cover: 55 Shrub/Saplina Stratum -% total cover: 5 Phalaris arundinacea FACW 30 Rosa pisocarpa FAC 100 Agrostis tenuis FAC 30 Dipsacus sylvestris FAC 30 Holcus lanatus FAC 10 Alopecurus pratensis FACW 5 Carex densa OBL 5 Woodv Vine Stratum -% total cover: 30 Tree Stratum -% total cover: 0 Rubus discolor FACU 100 Percent of Dominant Species that are OBL, FACW, or FAC (excluding FAC-) 4 of 5 = 80 %(50/20 Rule) Vegetation Criterion Met? Yes SOILS'; Mapped Unit Name: Concord silt loam Drainage Class: Pooriy drained Taxonomy: Fine, montmorillonitic, mesic Typic Ochraqualfs FIELD SOIL CHARACTERISTICS: Horizon Depth Matrix Color Redox Abundance. Size, Color Texture, Structure, Other 0-6" 2.5 YR 4/1 clay; mixed matrix fill 6-18" 5 Y 5/2 7.5 YR 5/6 medium, common mottles clay ❑ Histosol ❑ Prob. Aquic moisture regime �❑ Redox features ❑ Organic streaking ❑ Histic epipedon ❑ Reducing conditions ❑ Concretions ❑ Organic pan ❑ Sulfidic odor ❑ Gleyed ❑ Highly organic surFace layer 0 On hydric soils list Remarks: Mixed clay fill. Woody debris mixed in soil. Soil in sample is not native soil. Soil Criterion Met? : Yes' Depth of inundation N/A Depth to water table: >18" Depth to saturation: >18" Primary Indicators: Secondary lndicators (2 or more required): ❑ Inundated ❑ Oxidized rhizospheres � Local soil survey data ❑ Saturated in upper 12" ❑ Water-stained leaves ❑ FAC-Neutral test ❑ Water marks ❑ Recorded data (aerials, groundwater data) ' ❑ Drift lines Explain: ❑ Sediment deposits ❑ Other ❑ Drainage patterns Explain: Hydrology Criferion Met? : No Shapiro and Associates, Inc. 1650 N.W. Naito Parkway, Suite 302 Portland, OR 97209 (503) 274-9000 WETLAND DETERMINATION DATA SHEET -1987 MANUAL ClienUApplicant: Citv of Silverton Site: 503/509 Lincoln St. Plot: 9 T� R 1W S 26 City: Silverton - County: Marion State: OR Plot Location; Topography �50 NE of 9; 50' S of back fence, 75' W of E fence; flat Project #: 7965096.1 Determined by: DC/JG Date: 6/11/98 DETERMINATION: IS THIS PLOT IN A WETLAND?: Yes Do Normal Circumstances exist on the site? Yes Are Soils ❑ Vegetation ❑ Hydrology ❑ significantly disturbed? No VEGETATION Dominant Plant Species Ind. %Cover: Ind. %Cover: Herb Stratum -% total cover: l00 Shrub/Saqlinq Stratum -% total cover: 0 Agrostis tenuis FAC 50 Mentha arvensis FACW 20 Phalaris arundinacea FACW 20 Alopecurus pratensis FACW 10 Carex aboriginum OBL 5 Woodv Vine Stratum -% total cover: 0 Tree Stratum -% total cover: 0 Percent of Dominant Species that are OBL, FACW, or FAC (excluding FAC-) 3 of 3 = 100 %(50/20 Rule) FIELD SOIL CHARACTERISTICS: Horizon Depth Matrix Color Redox Abundance Size Color Texture, Structure, Other 0-12" 10 YR 4/2 frequent medium 7.5 YR 3/4 silt loam 12-18" 2.5 Y 5/2 frequent, fine 10 YR 4/4 silt loam ❑ Histosol ❑ Prob. Aquic moisture regime ❑� Redox features ❑ Organic streaking ❑ Histic epipedon ❑ Reducing conditions ❑ Concretions ❑ Organic pan ❑ Sulfidic odor ❑ Gleyed ❑ Highly organic surface layer ❑� On hydric soils list Soi( Criterion'Met? Yes Depth of inundation N/A Depth to water table: >18" Depth to saturation: >18" Primary Indicators: Secondary Indicators (2 or more required): ❑ Inundated ❑� Oxidized rhizospheres �❑ Local soil survey data ❑ Saturated in upper 12" ❑ Water-stained leaves ❑ FAC-Neutral test ❑ Water marks ❑ Recorded data (aerials, groundwater data) ❑ Drift lines Explain: ❑ Sediment deposits ❑ Other � Drainage patterns Explain: Hydrology Criterion' Met? Yes Shapiro and Associates, Inc. 1650 N.W. Naito Parkway, Suite 302 Portland, OR 97209 (503) 274-9000 Drainage Class: Poorly drained Taxonomy: Fine, Montmorillonitic, Mesic Typic Ochraqualfs WETLAND DETERMINATION DATA SHEET - 1987 MANUAL Client/Applicant: Citv of Silverton Site: 503/509 Lincoln St. Plot: 10 T 6S R 1W S� City: Silverton - County: Marion State: OR P(ot Location; Topography -100' ESE of #10 S. end of fence line in center of property. Slight depression Project #: 7965096.1 Determined by: DGJG Date: 6/11/98 DETERMINATION: IS THIS PLOT IN A WETLAND?: yes Do Normal Circumstances exist on the site? Yes Are Soils ❑ Vegetation ❑ Hydrology ❑ significantly disturbed? No VEGETATION Dominant Plant Species Ind. °/a Cover: - Ind. % Cover: Herb Stratum -% total cover: 50 Shrub/Saqlinq Stratum -% total cover: 0 Phalaris arundinacea FACW 70 Agr�ostis tenuis FAC 15 Solanum dulcamara FAC+ 10 Rumex crispus FAC+ 5 Holcus lanatus FAC 5 Woodv Vine Stratum -% total cover: 0 Tree Stratum -% total cover: 80 Fraxinus latifolia FACW 50 Populus balsamifera FAC 50 Percent of Dominant Species that are OBL, FACW, or FAC (excluding FAC-) 3 of 3 = 100 %(50/20 Rule) Remarks: Ru di near sample excluded; non representative of association being characterized. Vegetation Criterion Met? Yes SOILS,' Mapped Unit Name: Concord silt loam Drainage Class: Poorly drained Taxonomy: Fine, Montmorillonitic, mesic, Typic Ochraqualfs FIELD SOIL CHARACTERISTICS: Horizon Depth Matrix Color Redox Abundance, Size, Color Texture, Structure, Other 0-10" 10 YR 3/1 medium, frequent 7.5 YR 3/3 10-18" 2.5 YR 4/1 frequent medium 7.5 YR 3/3 ❑ Histosol ❑ Prob. Aquic moisture regime � Redox features ❑ Organic streaking � Histic epipedon ❑ Reducing conditions ❑ Concretions ❑ Organic pan ❑ Sulfidic odoc ❑ Gleyed ❑ Highly organic surtace layer ❑� On hydric soils list Soil Criterion Met? ' Yes HYDROLOGY Depth of inundation N/A Depth to water table: >18" Depth to saturation: >18" Primary Indicators: Secondary Indicators (2 or more required): ❑ Inundated ❑ Saturated in upper 12" ❑ Water marks ❑ Drift lines ❑ Sediment deposits ❑ Drainage patterns ❑ Oxidized rhizospheres � Local soil survey data ❑� Water-stained leaves ❑ FAC-Neutral test ❑ Recorded data (aerials, groundwater data) Exp4ain: ❑� Other Explain: algal mats on soil surface Hydrology Criterion Met? Yes Shapiro and Associates, Inc. 1650 N.W. Naito Parkway, Suite 302 Portland, OR 97209 (503) 274-9000 OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Date(s): 6/11/98_ Investigator(s): DC/,1G Project Name: City of Silverton WetlandCode: EG2 ProjectNumber: 7965096 Wildlife Fish Habitat Fish Habitat Habitat S#reams Lakes/Ponds Q1: A Q1: Q1: Q2: C Q2: Q2: Q3: C Q3: Q3: Q4: C Q4: Q4: Q5: A Q5: Q5: Q6: A Q6: Q6: Q7: A Q8: C Q9a: Q9b: C Q1: B Q1: C Q2: A Q2: A Q3: A Q3: A Q4: B Q4: C Q5a: Q5: C Q5b: C Q6: B Q6: B Water Quality �1: A �2: B �3: A �4: B �5: A �6: C Q1: Q2: Q3: Q4: Q5: Q6: Hydrologic Control Q1: B Q2: B Q3: B Q4: C Q5: C Q6: A Q7: A C Q1 C Q2 C Q3 B Q4 B Q5 B Q6 B C B B A B Sensitivity to Impact Q1 Q2 Q3 Q4 Q5 Q6 A B C A A C OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Function and Condition Summary Sheet for the Oregon Method WetlandCode: EC-2 ProjectNumber: 7965096 Function Evaluation Descriptor Rationale Wildlife Habitat The wetland provides Two or more Cowardin wetland classes. habitat for some wildlife Emergent veg. or wet meadow. Low degree species. of Cowardin class interspersion. Less than 0.5 acre of unvegetated open water present. Wetland connected to another body of water by surface water. Wetland connected to other wetlands within a 3 mile radius. Upstream not listed as water quality limited. Residential/Industrial land use within 500 feet of wetland edge. Fish Habitat - Streams N/A Fish Habitat - Lakes/Ponds N/A Water Quality The wetland's water quality Surface flow (including streams and ditches) function is impacted or is wetland's primary source of water. Unable degraded. to determine evidence of flooding or ponding during the growing season (or unapplicable). High (>60%) degree of wetland vegetation cover. Between 0.5 and 5 acres of wetland connected to other wetlands within a 3 mile radius. Residential/Industrial land use within 500 feet of wetland edge. Upstream not listed as water quality limited in watershed or adjacent to the wetland. Hydrologic Control The wetland's hydrologic No part of wetland located within 100-year control function is impacted floodplain or enclosed basin. Unable to or degraded. determine evidence of flooding or ponding during the growing season (or not applicable). Area is between 0.5 and 5 acres. Waterflow out of wetland is unrestricted. Emergent veg. or wet meadow is dominant cover type. Residential/Industrial land use within 500 ft of wetland on downstream or down-slope edge of wetland. Urban or Urbanizing land use in watershed upstream from area. Sensitivity to Impact The wetland is potentially Stream flow or bank has been modified by sensitive to future impacts human activities within 1 mile above wetland. Water is not being taken out of streams through active diking, drainage, or irrigation districts upstream. Upstream not listed as water quality limited in watershed upstream of the or adjacent to the wetland. Residential/industrial (developed) �land use within 500 feet of wetland's edge. Dominant Residential/lndustrial (developed) land use within 500 feet of wetland's edge. Emergent veg. and ponding,or open water only are the dominant cover types. Enhancement Potential The wetland has moderate Wetland has lost one or more functions or potential for enhancement. one or more functions is not present in assessment results for wildlife habitat, fish habitat, water quality and hydrologic control. Wetland's primary source of water is surFace OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Function and Condition Summary Sheet for the Oregon Method WetlandCode: EC-2 ProjectNumber: 7965Q96 Function Evaluation Descriptor Rationale flow, including streams and ditches. Water flow into wetland is not restricted, but if blocked, obstruction can be removed easily. Wetland's area is between 0.5 and 5 acres. Less than 10°/a of wetland's edge is bordered by a vegetative buffer 25 or more feet wide. Wetland is potentially sensitive to future impacts. Education The wetland site is not Wetland site is not�open to the public for appropriate for educational direct access or observation. There are no use. visible hazards to the public at the wetland site. Results of wildlife habitat and fish habitat assessment criteria prove wetland provides diverse Wildlife Habitat, or Fish Habitat function is intact. There is no existing physical public access to other features, and observation of other features cannot be made. There is not an existing access point within 250 feet of the wetland's edge (if existing-hazardous). Access is not available for limited mobility. Recreation The wetland is not There is not an existing access .point within appropriate for or does not 250 feet of the wetland's edge (if existing- provide recreational hazardous). Wetland not accessible by boat- opportunities. no boat launch within 1 mile/ cannot develop. No existing trails and viewing areas to guide user or if created', would disrupt wildlife or plant habitat. Wetland provides habitat for some species. Fishing is not allowed at wetland or adjacent water body (or not applicable). Hunting is not allowed at the wetland. Aesthetic Quality The wetland is considered Two Cowardin classes are visible from to be moderately pleasing. primary viewing area(s). Less than 25% of wetland is visible from viewing area(s). General appearance of wetland has visual detractors, which can be removed easily. Visual character with surrounding area is landscaped or manipulated by people. Natural, pleasant odors are present at primary viewing location. Continuous traffic and other intrusive noise and natural sounds are audible at primary viewing location. Silverton Wetlands of Special Interest for Protection Assessment Answer Sheet ° WetlandCode: EC-2 Question 1 B List: Question 2 B List: Question 3 B List: Question 4 B List: Question 5 B Question 6 B Question 7 B � List: Question 8 B Question 9 B Question 10 B Shapiro and Associates, Inc., 1650 N.W. Naito Parkway, Suite 302, Portland, Oregon 97209 Project Number: 7965096 Silverton Local Wetland Significance Assessment WetlandCode: EC-2 A. "OUT" Test No Wetlands artificially CREATED ENTIRELY FROM UPLAND that are: (a) created for the purpose of con#rolfing, storing, or maintaining stormwater; (b) active surface mining ponds; (c) ditches without free and open connection to waters of the state AND without fish; (d) <1 acre and unintentionally created from irrigation leak or construction activity; (e) of any size and created for the purpose of wastewater treatment, stock watering, settling of sediment, cooling industrial water, or as a golf course hazard. No Documented as being contaminated by hazardous substances, materials or wastes ("Hazmat sites"). This w et l and does NOT meet the criteria for identification as a Local Significant Wetland B. "IN" No Wetlands that score the highest ranEc for ANY of the four ecological functions addressed by OFWAM or equivalent methodology: No wildlife habitat, No fish habitat, No water quality, No hydrologic control. No Wetlands that (1) are rated in either the highest or second highest category for water quality (in OFWAM or equivalent) AND that (2) the wetland is within one-quarter mile from a water quality- limited stream as listed by DEQ. No Contains one or more rare wetland plant communities including those listed in the Oregon Natural Heritage Program's CLASSIFICATION AND CATALOG OF �IATIVE WETLAND PLANT COMMUNfTIES IN OREGON as G1-G3 and S1-S3. No Inhabited by any species listed by the federal or state government as a sensitive, threatened or endangered species in Oregon (unless consultation with appropriate agency deems the site not important for the maintenance of fhe species. No Wetland rates in either the highest or second highest category for Fish Habitat in OFWAM and is located adjacent to a stream segment that is mapped by ODFW as habitat for "fndigenous anadromous salmonids." No OPTIONAL CRITERION (at discretion of local government): Wetland represents a LOCALLY unique plant community. No OPTIONAL CRITERION (at discretion of local government): Wetland is publicly owned, rates highest rank for education potential, and there is documented use for educational purposes by a school or organization. Shapiro and Associates, Inc., 1650 N.W. Naito Parkway, Suite 302, Portland, Oregon 97215 Project Number' 7965096 SILVERTON LO�AL WETLANDS INVENTORY - Wetland Summary Sheet - Date(s) of Field Verification: Wetland Mapping Code: EC-3 Investigator(s): DC/JG Size (acres): 11.59 Location Legal: T6S, R1 W, S26 3600 Other: South of Hart Road Basin: Evans Creek Soils Mapped Series: Concord silt loam, Dayton silt loam, Wapato silty clay loam Hydrology Hydrologic Source: Water from wetland EC-4 Wetland Classification(s): POW Dominant Vegetation Trees Shrubs Vines Herbs Comments' OFFSITE DETERMINATION. Wetland EC-3 is Webb Lake. This open-water wetland is surrounded by a dam and dike that limits the extent of the wetland to the open water. The embankment around the lake is covered with Himalayan blackberry (Rubus discolor). The lake is surrounded on three sides by agricultural land, with residential areas near the southwest edge. Outflow is through a drain in the northern edge of the lake. Water flows out a culvert, into a ditch, and crosses Hobart Road into a series of ditches fhat eventually flow into Evans Creek, outside the study area. Wetland Classifcation Codes: PFO = palustrine forested PSS = palustrine scrub-shrub RSB = riverine streambed (intermittent) PEM = palustrine emergent POW = palustrine open water RUB = riverine unconsolidated bottom SHAPIRO Project Number.• 7965096 Wildlife Habitat Q1: Q2: Q3: Q4: Q5: Q6: Q7: Q8: Q9a: Q9b: Fish Habitat Streams B Q1: B Q2: C Q3: A Q4: A Q5: A Q6: A B I1 Enhancemen ` Pote ntial:` Q1: N/A Q2: N/A Q3: N/A Q4: N/A QSa: N/A Q5b: N/A Q6: N/A Fish Habitat Water LakeslPonds Quality Q1: A Q1: Q2: C Q2: Q3: C Q3: Q4: A Q4: Q5: B Q5: Q6: A Q6: Education Q1: C Q2: A Q3: A Q4: B Q5: C Q6: B Hydrologic Sensitivity to Control Impact A Q1: B Q1: A A Q2: A Q2: A C Q3: B Q3: C B Q4: A Q4: B B Q5: B Q5t B C Q6: B Q6: C Q7: A Recreation Aesthetic Quality Q1: C Q1: C Q2: C Q2: C Q3: C Q3: C Q4: A Q4: B Q5: B Q5: A Q6: B Q6: B Wildlife?Habitat: ' The wetland provides diverse wildlife habitat. Fish Habitat -'Streams: - N/A Fish Habitat = LakeslPonds: The wetland's fish habitat function is impacted or degraded. Water Quality: ' The wetland's water quality function is impacted or degraded. Hydrologic Control: The wetland's hydrologic control function is impacted or degraded. Sensitivity to Impact: The wetland is potentially sensitive to future impacts. Enhancement PotentiaL• N/A Education: The wetland site is not appropriate for educational use. Recreation: The wetland is not appropriate for or does not provide recreational opport Aesthetic Quality: The wetland is not pleasing. 4REGON FRESHWATER WETLAND ASSESSMENT METHODOLGY OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Function and Condition Summary Sheet for the Oregon Method WetlandCode: EC-3 ProjectNumber: 7965096 Function Evaluation Descriptor Rationale Wildlife Habitat The wetland provides One Cowardin wetland class with more than 5 diverse wildlife habitat. plant species. Emergent veg. & ponding or open water only. Low degree of Cowardin class interspersion. More than 1 acre of unvegetated open water present. Wetland connected to another body of water by surface water. Wetland connected to other wetlands within a 3 mile radius. Upstream not listed as water quality limited. Agricultural land use within 500 feet of wetland edge. More than 40% of wetland edge bordered by veg. buffer 25 or more feet wide. Fish Habitat - Streams N/A Fish Habitat - Lakes/Ponds The wetland's fish habitat More than 75% of stream shaded by riparian function is impacted or vegetation. Physical character of stream degraded. channel extensively modified/piped. Stream contains less than 10% of instream structures. Upstream not listed as water quality limited. Agricultural land use within 500 ft of wetland edge. Salmon, trout, or sensitive species present sometime during the year. Water Quality The wetland's water quality Surface flow (including streams and ditches) function is impacted or is wetland's primary source of water. degraded. Evidence of flooding or ponding during part of the growing season. Low (<60%) degree of wetland vegetation cover. Between 0.5 and 5 acres of wetland connected to other wetlands within a 3 mile radius. Agricultural land use within 500 feet of wetland edge. Upstream not listed as water quality limited in watershed or adjacent to the wetland. Hydrologic Control The wetland's hydrologic No part of wetland located within 100-year control function is impacted floodplain or enclosed basin. Evidence of or degraded. flooding or ponding during the growing season. Area is between 0.5 and 5 acres. Waterflow out of wetland is restricted or no outlet. Emergent veg. and ponding , or open water only is dominant cover type. Agricultural land use within 500 ft of wetland on downstream or down-slope edge of wetland. Urban or Urbanizing land use in watershed upstream from area. Sensitivity to Impact The wetland is potentially Stream flow or bank has been modified by sensi#ive to future impacts human activities within 1 mile above wetland. ' Water is being taken'out of stream(s) through active diking, drainage, or irrigation districts upstream. Upstream not listed as water quality limited in watershed upstream of the or adjacent to the wetland. Agricultural land use within 500 feet of wetland's edge. Dominant Agricuitural land use within 500 feet of wetland's edge. Emergent veg. and OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Function and Condition Summary Sheet for the Oregon Method WetlandCode: EC-3 ProjectNumber: 7965096 Function Evaluation Descriptor Rationale ponding,or open water only are the dominant cover rypes. Enhancement Potential N/A Education The wetland site is not Wetland site is not open to the public for appropriate for educationai direct access or observation. There are no use. visible hazards to the public at the wetland site. Results of wildlife habitat and fish habitat assessment criteria prove wetland provides diverse Wildlife Habitat, or Fish Habitat function is intact. There is no sxisting physical public access to other features, but observation of other features can be made. There is not an existing access point within 250 feet of the wetland's edge (if existing- hazardous). Access is not available for limited mobility. � Recreation The wetland is not There is not an existing access point within appropriate for or does not 250 feet of the wetland's edge (if existing- provide recreational hazardous). Wetland not accessible by boat- opportunities. no boat launch within 1 mile/ cannot develop. No existing trails and viewing areas to guide user or if created, would disrupt wildlife or plant habitat. Wetland provides diverse wildlife habitat. Fishing is not allowed at wetland or adjacent water body (or not applicable). Hunting is not allowed at the wetland. Aesthetic Quality The wetland is not pleasing. One Cowardin class is visible from primary viewing area(s). Less than 25% of wetland is visible from viewing area(s). General appearance of wetland has visual detractors which cannot be removed easily. Visual character with surrounding area is landscaped or manipulated by people. Natural, pleasant odors are pr.esent at primary viewing location. Continuous traffic and other intrusive noise and natural sounds are audible at primary viewing location. Silverton Wetlands of Special Interest for Protection Assessment Ans S WetlandCode: EC-3 Question 1 B List: Question 2 B List: Question 3 B List: Question 4 B List: Question 5 B Question 6 B Question 7 B List: Question 8 B Question 9 B Question 10 B Shapiro and Associates, Inc., 1650 N.W. Naito Parkway, Suite 302, Portland, Oregon 97209 Project Number: 7965096 Silverton ; Local Wetland Significance Assessment WetlandCode: EC-3 A. "OUT" Test No Wetlands artificially CREATED ENTIRELY FROM UPLAND that are: (a) created for the purpose of controtling, storing, or maintaining stormwater; (b) active surface mining ponds; (c) ditches without free and open connection to waters of the state AND without fish; (d) <1 acre and unintentionalty created from irrigation leak or construction activity; (e) of any size and created for the purpose of wastewater treatment, stock watering, settling of sediment, cooling industrial water, or as a golf course hazard. No Documented as being contaminated by hazardous substances, materials or wastes ("Hazmat sites"). This wetland MEETS the criteria for identification as a Local Significant Wetland B. "IN" Yes Wetlands that score the highest rank for ANY of the four ecological functions addressed by OFWAM or equivalent methodology: Yes wildlife habitat, No fish habitat, No water quality, No hydrologic control. No Wetlands that (1) are rated in either the highest.or second highest category for water quality (in OFWAM or equivalent) AND that (2) the wetland is within one-quarter mile from a water quality- limited stream as listed by DEQ. No Contains one or more rare wetland plant communities including those listed in the Oregon Natural Heritage Program's CLASSIFICATION AND CATALOG OF NATIVE WETLAND PLANT COMMUNITIES IN OREGON as G1-G3 and S1-S3. No Inhabited by any species listed by the federal or state government as a sensitive, th�eatened or endangered species in Oregon (unless consultation with appropriate agency deems the site not important for the maintenance of the species. No Wetland rates in either the highest or second highest category for Fish Habitat in OFWAM and is located adjacent to a stream segment that is mapped by ODFW as habitat for "Indigenous anadromous salmonids." No OPTIONAL CRITERION (at discretion of local government): Wetland represents a LOCALLY unique plant community. No OPTIONAL CRITERION (at discretion of local government): Wetland is publicly owned, rates highest rank for education potential, and there is documented use for educational purposes by a school or organization. Shapiro and Associates, Inc., 1650 N.W. Naito Parkway, Suite 302, Portland, Oregon 97215 Project Number: 7965096 SILVERTON LOCAL WETLANDS INVENTORY - Wetland Summary Sheet - Date(s) of Field Verification: 06/11/98 Wetland Mapping Code: EC-4 a, b, c, d, e Investigator(s): DC/JG Size (acres): 6.43 Location Legal: T6S, R1 W, S26 Other: Silverton Industrial Park, Olson Rhododendron Farm Basin: Evans Creek 200, 301, 500, 600, 700, 800, 900, 3601 Soifs : . Mapped Series: Amity silt loam, Conco�d silt loam, Dayton silt loam, Wapato silty clay loam Hydrology Hydrologic Source: Groundwater, water district reservoir overflow Wetland Classification(s): PEM Dominant Vegetation Trees Shrubs Vines Herbs Comments: _ This large wetland complex is in the Silverton Industrial Park and incfudes a small area on the northern end of the Olson Rhododendron Farm and an adjacent field to the east. Predominant vegetatian on the site is herbaceous. Small areas of shrub growth, mostly willows (Salix spp.), and a few areas with trees interrupt the otherwise flat and monotonous reed cana .rygrass (Phalaris arundinacea) desert. A system of ditches from the east, west, and south brings water onto the south end of the site. Most of the water is then conveyed north across the site, crossing Eska Way in a culvert. Two mitigation wetlands (EC-9) bisect the EC-4 wetland in the industrial park. Wetland Classification Codes: PFO = palustrine forested PSS = palustrine scrub-shrub RSB = riverine streambed (intermittent) � PEM = palustrine emergent POW = palustrine open water RUB = riverine unconsolidated bottom SHAPIRO Project Number.• 7965096 WETLAND DETERMINATION DATA SHEET - 1987 MANUAL Client/Applicant: Citv of Silverton Site: Olson Rhododendron Farm Plot: 13 T 6S R 1W S 26 City: Silverton County: Marion State: OR Plot Location; Topography NE corner of property; 20' S. of ditch, 40' W of fence, level Project #: 7965096.1 Determined by: DC/JG Date: 6/11/98 DETERMINATION: IS THIS PLOT IN A WETLAND?: yes Do Normal Circumstances exist on the site? Yes Are Soils ❑ Vegetation � Hydrology ❑ significantiy disturbed? No VEGETATION� Dominant Plant Species Ind. %Cover: Ind. %Cover: Herb Stratum -% total cover: 70 ShrublSaplinq Stratum -% total cover: � p Holcus lanatus FAC 60 Sagittaria latifolia OBL 50 Juncus effusus FACW Agrostis tenuis FAC Festuca arundinacea FAC- Dactylis glomerata FACU Vicia satava UPL 20 Alnus rubra FAC 50 20 10 Woodv Vine Stratum -% total cover: 5 Tree Stratum -°/o total cover: 15 Rubus discolor FACU 100 Sagittaria latifolia OBL 70 Populus balsamzfera FAC 15 Alnus rubra FAC 10 Percent of Dominant Species that are OBL, FACW, or FAC (excluding FAC-) 6 of 7 = 86 %(50/20 Rule) Vegetation Criferion Met? Yes SOILS Mapped Unit Name: Dayton silt loam Drainage Class: Poorly drained Taxonomy: Fine montmorillonitic, mesic Typic Albaquales FIELD SOIL CHARACTERISTICS: Horizon Depth Matrix Color Redox Abundance, Size, Color Texture, Structure, Other 0-7" 10 YR 3/2 few, fine, faint 10 YR 3/3 mottles clay loam 7-18" 10 YR 3/1 commen medium 7.5 YR 3/4 mottles blocky dense silt loam ❑ Histosol ❑ Prob. Aquic moisture regime 0 Redox features ❑ Organic streaking ❑ Histic epipedon ❑ Reducing conditions ❑ Concretions ❑ Organic pan ❑ Sulfidic odor ❑ Gleyed ❑ Highly organic surface layer � On hydric soi[s list Soil Criterion Met? Yes HYDROLOGY Depth of inundation N/A Depth to water table: 11" Depth to saturation: 5" Primary Indicators: Secondary Indicators (2 or more required): ❑ Inundated � Saturated in upper 12" ❑ Water marks ❑ Drift lines ❑ Sediment deposi#s ❑ Drainage patterns O Oxidized rhizospheres ❑ Local soil survey data ❑ Water-stained leaves ❑ FAC-Neutral test ❑ Recorded data (aerials, groundwater data) Explain: ❑ Other Explain: Hydrology Criterion Met? Yes Shapiro and Associates, Inc. 1650 N.W. Naito Parkway, Suite 302 Portland, OR 97209 (503) 274-9000 OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Date(s): 6/11/98 Investigator(s): DC/JG Project Name: City of Silverton WetlandCode: EC-4/EC-9 ProjectNumber: 7965096 Wildlife Fish Habitat Fish Habitat Water Hydrologic Sensitivity to Habitat Streams LakeslPonds Quality Control - Impact Q1: A Q1: A Q1: Q1: A Q1: B Q1: A Q2: C Q2: C Q2: Q2: A Q2: A Q2: A Q3: B Q3: B Q3: Q3: A Q3: A Q3: C Q4: C Q4: A Q4: Q4: A Q4: A Q4: A Q5: A Q5: C Q5: Q5: A Q5: C Q5: A Q6: A Q6: C Q6: Q6: C Q6: A Q6: B Q7: A Q7: A Q8: C Q9a: � Q9b: A Q1: A Q1: C Q1: A Q1: A Q2: A Q2: A Q2: C Q2: A Q3: A Q3: B Q3: C Q3: A Q4: A Q4: C Q4: B Q4: B QSa: Q5: A Q5: B Q5: A Q5b: A Q6: B Q6: B Q6: A Q6: B OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Function and Condition Summary Sheet for the Oregon Method WetiandCode: EC-4/EC-9 ProjectNumber: 7965096 Function Evaluation Descriptor Rationale Wildlife Habifat The wet{and provides habitat for some wildlife species. Two or more Cowardin wet{and dasses. Emergent veg. or wet meadow. Moderate degree of Cowardin class interspersion. Less than 0.5 acre of unvegetated open water present. Wetland connected to another body of water by surface water. Wetland connected to other wetlands within a 3 mile radius. Upstream not listed as water quality limited. Residential/Industrial land use within 500 feet of wetland edge. More than 40% of wetland edge bordered by veg. buffer 25 or more feet wide. Fish Habitat - Streams The wetland's fish habitat More than 75% of stream shaded by riparian function is impacted or vegetation. Physical character of stream degraded. channel extensively modi�ed/piped. Stream contains between 10 and 25% of instream structures. Upstream not listed as water quality limited. Residential/Industrial land use within 500 feet of wetland edge: No fish species present during the year. Fish Habitat - Lakes/Ponds N/A Water Quality The wetland's water quality Surtace flow (including streams and ditches) function is intact. is wetland's primary source of water. Evidence of flooding or ponding during part of the growing season. High (>60%) degree of wetland vegetation cover. More than 5 acres of wetland area. Residential/Industrial land use within 500 feet of wetland edge. Upstream not listed as water quality limited in watershed or adjacent to the wetland. Hydrologic Control The wetland's hydrologic No part of wetland located within 100-year control function is intact. floodplain or enclosed basin. Evidence of flooding or ponding during the growing season. Area is more than 5 acres. Waterflow out of wetland is restricted or no outlet. Emergent veg. or wet meadow is dominant cover type. Residential/Industrial land use within 500 ft of wetland on downstream or down-slope edge of wetland. Urban or �Jrbanizing land use in watershed upstream from area. Sensitivity to Impact The wetland is potentially Stream flow or bank has been modified by sensitive to future impacts human activities within 1 mile above wetland. Water is being taken out of stream(s) through active diking, drainage, or irrigation districts upstream. Upstream not listed as water quality limited in watershed upstream of the or adjacent to the wetland. Residential/industrial (developed) land use within 500 feet of wetland's edge. Dominant Residential/Industrial (developed) land use within 500 feet of wetland's edge. Emergent OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Function and Condition Summary Sheet for the Oregon Method WetlandCode: EC-4/EC-9 . ProjectNumber: 7965096 Function Evaluation Descriptor Rationale veg. only or wet meadow is the dominant cover. Enhancement Potential The wetland has high One or more of functions for assessment enhancement potentiai. results for wildlife habitat, fish habitat, water quality and hydrologic control is impacted or degraded. Wetland's primary source of water is surface flow, including streams and ditches. Water flow into wetland is not restricted, but if blocked, obstruction can be removed easily. Wetland's area is more than 5 acres. More than 40% of wetland's edge is bordered by a vegetative buffer 25 or more feet wide. Wetland is potentially sensitive to future impacts. Education The wetland site is not Wetland site is not open to the public for appropriate for educational direct access or observation. There are no use. visible hazards to the public at the wetland site. Provides wildlife habitat for some species, or fish habitat is impacted or degraded. There is no existing physical public access to other features, and observation of other features cannot be made. There is a maintained public access point within 250 feet of the wetland's edge. Access is not available for limited mobility. Recreation The wetland has the There is a maintained public access point potential to provide within 250 feet of wetland's edge. Wetland not recreational opportunities, accessible by boat-no boat launch within 1 mile/ cannot develop. No existing trails and viewing areas to guide user or if created, would disrupt wildlife or plant habitat. Wetland provides habitat for some species. Fishing is not allowed at wetland or adjacent water body (or not applicable). Hunting is not allowed at the wetland. Aesthetic Quality The wetland is considered More than two Cowardin classes are visible to be pleasing. from primary viewing area(s). More than 50% of wetland is visible from viewing area(s). General appearance of wetland has no visual detractors. Visual character with surrounding area is landscaped or mar�ipulated by people. Natural, pleasant odors are present at primary viewing location. Some traffic and other similar sounds and natural sounds are audible at primary viewing locations. Silverton Wetlands of Special Interest for Protection Assessment Answe Sheet WetlandCode: EC-4/EC-9 This is potentially a Wetland of Special Interest for Protection. Question 1 B List: Question 2 B List: Question 3 B List: Question 4 B List: Question 5 B Question 6 B Question 7 B List: Question 8 A Question 9 B Question 10 B Shapiro and Associates, Inc., 1650 N.W. Naito Parkway, Suite 302, Portland, Oregon 97209 Project Number: 7965096 Silverton Local Wetland Significance Assessment ', WetlandCode: EC-4/EC-9 A. "OUT" Test No Wetlands artificially CREATED ENTIRELY FROM UPLAND that are: (a) created for the purpose of controlling, storing, or maintaining stormwater; (b) acfive surface mining ponds; (c) ditches without free and open connection to waters of the state AND without fish; (d) <1 acre and unintentionally created from irrigation leak or construction activity; (e) of any size and created for the purpose of wastewater treatment, stock watering, settling of sediment, cooling industrial water, or as a golf course hazard. No Documented as being contaminated by hazardous substances, materials or wastes ("Hazmat sites"). T wetlan d oes NOT meet the criteria for identification as a Local Significant Wetland B. "�N�• No Wetlands that score the highest rank for ANY of the four ecological functions addressed by OFWAM or equivalent methodology: No wildlife habitat, No fish habitat, Yes water quality, Yes hydrologic control. No Wetlands that (1) are rated in either the highest or second highest category for water quality (in OFWAM or equivalent) AND that (2) the wetland is within one-quarter mile frorn a water quality- limited stream as listed by DEQ. No Contains one or more rare wetland plant communities including those listed in the Oregon Natural Heritage Program's CLASSIFICATiON AND CATALOG OF NATIVE WETLAND PLANT COMMUNITIES IN OREGON as G1-G3 and S1-S3. No Inhabited by any species listed by the federai or state government as a sensitive, threatened or endangered species in Oregon (unless consultafion with appropriate agency deems the site not important for the maintenance of the species. No Wetland rates in either the highest or second highest category for Fish Habitat in OFWAM and is located adjacent to a stream segment fhat is mapped by ODFW as habitat for "Indigenous anadromous salmonids." No OPTIONAL CRITERION (at discretion of local government): Wetland represents a LOCALLY unique plant community. No OPTIONAL CRITERION (at discretian of local government}: Wetland is publicly owned, rates highest rank for education potential, and there is documented use for educational purposes by a school or organization. Shapiro and Associates, Inc., 1650 N.W. Naito Parkway, Suite 302, Portland, Oregon 97215 Project Number: 7965096 SILVERTON LO�AL WETLANDS INVENTORY - Wetland Summary Sheet - Date(s) of Field Verification: Wetland Mapping Code: EG5 Investigator(s): DC/ JG Size (acres): 1.03 Location Legal: T6S, R1 W, S27 300 Other: Btwn Hillsboro-Silverton Hwy & RR, N of Jefferson Basin: Evans Creek Soils Mapped Series: Woodburn silt loam (WuA) Hydrology :, : Hydrologic Source: Surface runoff, precipitation Wetland Classification(s): PFO Dominant Vegetation ' Trees Shrubs Vines Herbs Populus balsamifera Rubus discolor Comments: OFFSITE DETERMINATION. Wetland EC-5 is a strip of forested wetland between the Hillsboro-Silverton Highway and the railroad tracks. The cottonwood trees (Populus balsamifera) on the site are mature, approximately 75 feet high, and appear healthy. Old mattresses, tarps, and other debris on the site indicate that the area is used occasionally by homeless people as a camp. Wetland Classification Codes: PFO = palustrine forested PSS = palustrine scrub-shrub RSB = riverine streambed (intermittent) I PEM = palustrine emergent POW = palustrine open water RUB = riverine unconsolidated bottom SHAP/RO Project Number. 7965096 OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Date(s):. 6/11/98 Investigator(s): DC/JG Project Name: City of Silverton LWI WetlandCode: EG5 ProjectNumber: 7965096 Wildlife Fish Habitat Fish Habitat Habitat Streams Lakes/Ponds Q1; B Q1: Q1: Q2: A Q2: Q2: Q3: C Q3: Q3: Q4: C Q4: Q4: Q5: B Q5: Q5: Q6: A Q6: Q6: Q7; A Q8: C Q9a: Q9b: C Q1: A Q2: C Q3: A Q4: B Q5a: Q5b: C Q6: B Q1 Q2 Q3 Q4 Q5 Q6 B B B C C B Water Quality Q1: Q2: Q3: Q4: Q5: Q6: Q1: Q2: Q3: Q4: Q5: Q6: Hydrologic I Sensitivity to Control Impact B B A B A C Q1: Q2.: Q3: Q4: Q5: Q6: Q7: B B B B A A B Q1: Q2: Q3: Q4: Q5: Q6: B B C A A A C Q1: C Q2: C Q3: B . Q4: B Q5: B Q6: OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Function and Condition Summary Sheet for the Oregon Method WetlandCode: EG5 Pro}ectNumber: 7965096 Function Evaluation Descriptor Rationale Wildlife Habitaf The wetland provides One Cowardin wetland class with more than 5 habitat for some wildlife plant species. Woody vegetation is dominant species. vegetation cover. Low degree of Cowardin class interspersion. Less than 0.5 acre of unvegetated open water present. Wetland not connected to another body of water, but water within 1 mile. Wetland connected to other wetlands within a 3 mile radius. Upstream not listed as water quality limited. Residential/Industrial land use within 500 feet of wetland edge. Fish Habifat - Sfreams N/A Fish Habitat - Lakes/Ponds N/A Water Quality The wetland's water quality Precipifation or sheet flow is wetland's function is impacted or primary source of water. Unable to determine degraded. evidence of flooding or ponding during the growing season (or unapplicable). High (>60%) degree of wetland vegetation cover. Between 0.5 and 5 acres of wetland connected to other wetlands within a 3 mile radius. Residential/Industrial land use within 500 feet of wetland edge. Upstream not listed as water quality limited in watershed or adjacent to the wetland. Hydrologic Control The wetland's hydrologic No part of wetland located within 100-year control function is impacted floodplain or enclosed basin. Unable to or degraded. determine evidence of flooding or ponding during the growing season (or not applicable). Area is between 0.5 and 5 acres. Minor restrictions slow down waterflow out of the wetland. Woady vegetation is dominant cover type. Residential/{ndustrial land use within 500 ft of wetland on downstream or down- slope edge of wetland. Agricultural land use in watershed upstream from area. Sensitivity to Impact The wetland is potentially Stream flow or bank has not been modified by sensitive to future impacts human activities within 1 mile above wetland. � Water is not being taken out of streams through active diking, drainage, or irrigation districts upstream. Upstream not listed as water quality fimited in watershed upstream of the or adjacent to the wetland. Residential/industrial (developed) land use within 500 feet of wetland's edge. Dominant Residential/Industrial (developed) land use within 500 feet of wetland's edge. Woody vegetation is the dominant cover. Enhancement Potential The wetland has moderate One or more of functions for assessment potential for enhancement. results for wildlife habifat, fish habitat, water quality and hydrologic control is impacted or degraded. Wetland's primary source of water is precipitation or sheet flow. Water flow into OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Function and Condition 5ummary Sheet for the Oregon Method WetlandCode: EG5 ProjectNumber: 7965096 Function Evaluation Descriptor Rationale wetland is not restricted, but if blocked, obstruction can be removed easily. Wetland's area is between 0.5 and 5 acres. Less than 90% of wetland's edge is bordered by a vegetative buffer 25 or more feet wide. Wetland is potentially sensitive to future impacts. Education The wetiand has potential Wetland site is open to the public for direct for educationai use. access or observation, but allowed only with permission. One to two visible safety hazards exist at the wetland site. Provides wildlife habitat for some species, or fish habitat is impacted or degraded. There is no existing physical public access to other features, and observation of other features cannot be made. There is not an existing access point within 250 feet of the wetland's edge (if existing-hazardous). Access is not available . for limited mobilitv. Recreation The wetland is not appropriate for or does not provide recreational opportunities. Aesthetic Quality The wetland is not pleasing. There is not an existing access point within 250 feet of the wetland's edge (if existing- hazardous). Wetland not accessible by boat- no boat launch within 1 milel cannot develop. No existing trails and viewing areas to guide user or if created, would disrup# wildlife or plant habitat. Wetland provides habitat for some species. Fishing is not allowed at wetiand or adjacent water body (or not applicable). Hunting is not allowed at the wetland. One Cowardin class is visible from primary viewing area(s). Between 25 and 50% of wetland is visible from viewing area(s). General appearance of wetland has visual detractors which cannot be removed easily. Visual character with surrounding area is developed with no landscaping. At certain times, unpleasant odors are present at the primary viewing location: Continuous traffic and other intrusive noise and NO natural sounds are audible at primary viewing location. Silverton Wetlands of Special lnterest for Protection Assessment Answer Sheet WetlandCode: EC-5 Question 1 B List: Question 2 B List: Question 3 B List: Question 4 B List: Question 5 B Question 6 B Question 7 B List: Question 8 B Question 9 B Question 10 B Shapiro and Associates, Inc., 1650 N.W. Naito Parkway, Suite 302, Portland, Oregon 97209 Project Number: 7965696 Silverton Local Wetland Significance Assessment � WetlandCode: EC-5 A. "OUT" Test No Wetlands artificially CREATED ENTIRELY FROM UPLAND that are: (a) created for the purpose of controlling, storing, or maintaining stormwater; (b) active surface mining ponds; (c) ditches without free and open connection to waters of the state AND without fish; (d) <1 acre and unintentionally created from irrigation leak or construction activity; (e) of any size and created for the purpose of wastewater treatment, stock watering, settling of sediment, cooling industr+al watec, or as a golf course hazard. No Documented as being contaminated by hazardous substances, materials or wastes ("Hazmat sites"). This wetland does NOT meet the criteria for identification as a Local Significant Wetland B. "IN" No Wetlands that score the highest rank for ANY of the four ecological functions addressed by� OFWAM or equivalent methodology: No wildlife habitat, No fish habitat, No water quality, No hydrologic control. No Wetlands that (1) are rated in either the highest or second highest category for water quality (in OFWAM or equivalentj AND that (2) the wetland is within one-quarter mile from a water quality- limited stream as listed by DEQ. No Contains one or more rare wetland plant communities including those listed in the Oregon Natural Heritage Program's CLASSIFICATION AND CATALOG OF NATIVE WETLAtVD PLANT COMMUNITIES {N OREGON as Gti-G3 and S1-S3. No Inhabited by any species listed by the federal or state government as a sensitive, threatened or endangered species in Oregon (unless consultation with appropriate agency deems the site not important for the maintenance of the species. No Wetland rates in either the highest or second highest category for Fish Habitat in OFWAM and is focated adjacent to a stream segment that is mapped by ODFW as habitat for "Indigenous anadromous salmonids." No OPTIONAL CRITERION (at discretion of iocal government): Wetland represents a LOCALLY unique plant community. No OPTfONAL CRITERION (at discretion of loca4 government): Wetland is publiciy owned, rates highest rank for education potential, and there is documented use for educational purposes by a school or organization. Shapiro and Associates, Inc., 1650 N.W. Naito Parkway, Suite 302, Portland, Oregon 97215 Project Number: 7965096 SILVERTON LOCAL WETLANDS INVENTORY - Wetland Summary Sheet - Date(s) of Field Verification: Wetland Mapping Code: EC-6 a, b, c, d Investigator(s): DC/JG Size (acres): 1.74 Location Legal: T6S, R1 W, S27 300, 1300, 1400, 1500 Other: OId RR junction W of Hills.-Silv. Hwy, S of Jeff. Basin: Evans Creek Soils Mapped Series: Clackamas gravelly loam, Courtney gravelly silty ciay loam, Woodburn siit loam (WuA) Hydrology =_ Hydrologic Source: Surface runoff, precipitation Wetland Classification(s): PEM, PSS Dominant Vegetation Trees Shrubs Vines Herbs Solanum dulcamara Phafaris arundinacea Agrostis tenuis Alopecurus pratensis Mentha arvensis Rur�ex crispus Holcus lanatus Comments• This wetland complex is associated with the junction of two raifroad grades and drainage ditches adjacent to them. EC-6a is a drainage ditch that conveys water southward along the eastern side of the rail bed and opens into a triangular area at the junction of the two rail lines. Water from this ditch apparently is sufficient to flood portions of the area and maintain enough soil moisture to support a predominance of hydrophytes on the site. EC-6b is a small, isolated wetland in the corner between the rail bed and the highway. This low area apparently has no outlet, so water collects and supports the site. EG6c and d are small, tinear (PSS) wetiands along the northern and southern sides of the east-west rail line. Both sites have footpaths throughout them and have rather dense growth of hydrophytic trees and shrubs. Wetland Classification Codes: PFO = palustrine forested PSS = palustrine scrub-shrub RSB = riverine streambed (intermittent) PEM = palustrine emergent POW = palustrine open water RUB = riverine unconsolidated bottom SHAPIRO Project Number.• 7965096 OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Date(s): 6/11/98 Investigator(s): DC/JG Project Name: City of Silverton WetlandCode: EC-6 ProjectNumber: 7965096 Wildlife Habitat Q1: Q2: Q3: Q4: Q5: Q6: Q7: Q8: Q9a: Q9b: Fish Habitat' Fish Habitat Streams Lakes/Ponds A Q1: Q1: B Q2: Q2: C Q3: Q3: C Q4: Q4: B Q5: Q5: B Q6: Q6: A C B Enhancement ` Ed� Potential ' Q1: B Q1: Q2: A Q2: Q3: A Q3: Q4: B Q4: Q5a Q5: QSb: B Q6: Q6: B Water Quality Q1: Q2: Q3: Q4: Q5: Q6: A Q1: A Q2: B Q3: C Q4: C Q5: B Q6: Hydrologic Sensitivity to Control Impact A Q1: B Q1: A A Q2: A Q2: A A Q3: B Q3: C B Q4: A Q4: A A Q5: B Q5: A C Q6: A Q6: C Q7: A ion' Aesthetic Quality A Q1: A C Q2: A C Q3: C B Q4: C B Q5: A B Q6: C Wildlife'Habitat: '' The wetland provides habitat for some wildlife species. Fish Habitat - Streams: ` NIA Fish Habitat - Lakes/Ponds: N/A Water Quality: The wetland's water quality function is intact. Hydrologic Control: The wetland's hydrologic control function is intact. Sensitivity'to (mpact: ` The viretland is potentiafly sensitive to future impacts. Enhancement PotentiaL• The wetland has moderate potential for enhancement. Education: . The wetland has potential for educational use. Recreation:' The wetland has the potential to provide recreational opportunities. Aesthetic Quality: The wetland is not pleasing. OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Function and Condition Summary Sheet for the Oregon Method WetlandCode: EC-6 ProjectNumber: 7965096 Funct'ron Evaluation Descriptor Rationale Wildlife Habitat The wetland provides Two or more Cowardin wetland classes. habitat for some wildlife Emergent veg. & ponding or open water only. species. Low degree of Cowardin class interspersion. Less than 0.5 acre of unvegetated open water present. Wetland not connected to another body of water, but water within 1 mile. Wetland not connected to other wetlands, but within 3 mile radius of other wetlands. Upstream not listed as water quality limited.. Residential/Industrial land use within 500 feet of wetland edge. Fish Habitat - Streams N/A Fish Habitat - Lakes/Ponds N/A Water Quality The wetland's water quality Surface flow (including streams and ditches) function is intact. is wetland's primary source of water. Evidence of flooding or ponding during part of the growing season. High (>60%) degree of wetland vegetation cover. Between 0.5 and 5 acres of wetland connected to other wetlands within a 3 mile radius. Residential/Industrial land use within 500 feet of wetland edge. Upstream not listed as water quality limited in watershed or adjacent to the wetland. Hydrologic Control The wetland's hydrologic No part of wetland located within 100-year control function is intact. floodplain or enclosed basin. Evidence of flooding or ponding during the growing season. Area is between 0.5 and 5 acres. Waterflow out of wetland is restricted or no outlet. Emergent veg. and ponding , or open water only is dominant cover type. Resi.dential/Industrial land use within 500 ft of � wetland on downstream or down-slope edge of wetland. Urban or Urbanizing land use in watershed upstream from area. Sensitivity to Impact The wetland is potentially Stream flow or bank has been modified by sensitive to future impacts human activities within 1 mile above wetland. Water is being taken out of stream(s) through active diking, drainage, or irrigation districts upstream. Upstream not listed as water quality limited in watershed upstream of the or adjacent to the wetland. Residential/industrial (deveioped) land use within 500 feet of wetland's edge. Dominant Residential/Industrial (developed) land use within 500 feet of wetland's edge. Emergent veg. and ponding,or open water only are the dominant cover types. Enhancement Potential The wetland has moderate Wetland has lost one or more functions or potential for enhancement. one or more functions is not present in assessment results for wildlife habitat, fish habitat, water quality and hydrologic control. Wetland's primary source of water is surface OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Function and Condition Summary Sheet for the Oregon Method WetiandCode: EC-6 ProjectNumber: 7965096 Function Evaluation Descriptor Rationale flow, including streams and ditches. Water flow into wetland is not restricted, but if blocked, obstruction can be removed easily. Wetland's area is between 0.5 and 5 acres. Between 10 and 40 % of wetland's edge is bordered by a vegetative buffer 25 or more feet wide. Wetland is potentially sensitive to future impacts. Education The wetland has potentiai Wetland site is open to the public for direct for educational use. access or observation. There are no visible hazards to the public at the wetland site. Provides wildlife habitat for some species, or fish habitat is impacted or degraded. There is no existing physical public access to other features, and observation of other features cannot be made. There is not an existing access point within 250 feet of the wetland's edge (if existing-hazardous). Access is not available for limited mobility. Recreation The wetland has the There is a maintained public access point potential to provide within 250 feet of wetland's edge. Wetland not recreational opportunities. accessible by boat-no boat launch within 1 mile/ cannnt develop. No existing trails and viewing areas to guide user or if created, would disrupt wildlife or plant.habitat. Wetland provides habitat for some species. Fishing is not allowed at wetland or adjacent water body (or not applicable). Hunting is not allowed at the wetland. Aesthetic Quality The wetland is not pleasing. More than two Cowardin classes are visible from primary viewing area(s). More than 50% of wetland is visible from viewing area(s). General appearance of wetland has visual detractors which cannot be removed easily. Visual character with surrounding area is developed with no landscaping. Natural, pleasant odors are present at primary viewing location. Continuous traffic and other intrusive noise and NO natural sounds are audible at primary viewing location. Silverton Wetlands of Special Interest for Protection Assessment Answer Sheet WetlandCode: EC-6 Question 1 B List: Question 2 B List: Question 3 B List: Question 4 B List: Question 5 B Question 6 B Question 7 B List: Questian 8 B Question 9 B Question 10 B Shapiro and Associates, Inc., 1650 N.W. Naito Parkway, Suite 302, Portland, Oregon 97209 Project Number: 7965096 Silverton Local Wetland Significance Assessment WetlandCode: EC-6 A. "OUT" Test No Wetlands artificially CREATED ENTIRELY FROM UPLAND that are: (a) created for the purpose of controiling, storing, or maintaining stormwater; {b) active surface mining ponds; (c) ditches without free and open connection to waters of the state AND without fish; (d) <1 acre and unintentiona(ly created from irrigation leak or construction activity; (e) of any size and created for the purpose of wastewater treatment, stock watering, settling of sediment, cooling industrial water, or as a golf course hazard. No Documented as being contaminated by hazardous substances, materials or wastes ("Hazmat sites"). This wetland MEETS the criteria fo� identification as a Local Significant Wetland B. , •�N�• Yes Wetlands that score the highest rank for ANY of the four ecological functions addressed by OFWAM or equivalent rnethodology: No wildlife habitat, No fish habitat, Yes water quality, Yes hydrologic control. No Wetlands that (1) are rated in either the highest or second highest category for water quality {in OFWAM or equivalent) AND that (2) the wetland is within one-quar#er mile from a water quality- limited stream as listed by DEQ. No Contains one or more rare wetland plant communities including those listed in the Oregon Natural Heritage Program's CLASSIFICATION AND CATALOG OF NATIVE WETLAND PLANT COMMUNITIES IN OREGON as G1-G3 and S1-S3. No Inhabited by any species listed by the federal or state government as a sensitive, threatened or endangered species in Oregon (unless consultation with appropriate agency deems the site not important for the maintenance of the species. No Wetland rates in either the highest or second highest category for Fish Habitat in OFWAM and is located ad�acent to a stream segment that is mapped by ODFW as habitat for "Indigenous anadromous salmonids." No OPTIONAL CRITERION (at discretion of local government): Wetland represents a LOCALLY unique plant community. No OPTIONAL CRITERION (at discretion of local government): Wetland is publicly owned, rates highest rank for education potential, and there is documented use for educational purposes by a school or organization. Shapiro and Associates, Inc., 1650 N.W. Naito Parkway, Suite 302, Portland, Oregon 97215 Project Number: 7965096 1 _. I � , , i � SILVERTON LOCAL WETLANDS INVENTORY - Wetland Summary Sheet - Date(s) of Field Verification: 9�23\98 Wetland Mapping Code: EC-7 Investigator(s): JG Size (acres): 0.04 Location Legal: T6S, R1 W, S26 200, 1300, 1400 Other: Quarry Ave. and UGB Basin: Evans Creek Soits Mapped Series: Dayton silt loam Hydrolo9Y ; Hydrologic Source: Surface flow Wetland Classification(s): PEM Dominant Vegetation - , ! ' Trees Shrubs Vines Herbs Comrnents• OFFSITE DETERMINATION: EC-7 is an intermittent stream. The streambead apparently has been excavated and realigned. This stream flows into Abiqua Creek about .5 mile northwest of the UGB. Wetland Classification Codes: PFO = palustrine forested PSS = palustrine scrub-shrub RSB = riverine streambed (intermittent) PEM = palustrine emergent POW = palustrine open water RUB = riverine unconsolidated bottom SHAPIRO Project Number.• 7965d96 Wildlife Fish Habitat Fish Habitat Habitat Streams -- Lakes/Ponds Q1: B Q1: C Q1: Q1 Q2: C Q2: B Q2: Q2 Q3: C Q3: C Q3: Q3 Q4: C Q4: A Q4: Q4 Q5: A Q5: B Q5: Q5 Q6: A Q6: A Q6: Q6 Q7: A Q8: B Q9a: Q9b: C Q1: B Q2: A Q3: A Q4: C Q5a: Q5b: C Q6: B Q1: Q2: Q3: Q4: Q5: Q6: C A B C C B Water Quality A B B B B C Q1: Q2: Q3: Q4: Q5: Q6: Hydrologic Control Q1: B Q2: B Q3: C Q4: C Q5: C Q6: B Q7: B C Q1 B Q2 B Q3 B Q4 B Q5 B Q6 Sensitivity to Impact Q1: Q2: Q3: Q4: Q5: Q6: A B C B B B OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Function and Condition Summary Sheet for the Oregon Method WetlandCode: EC-7 ProjectNumber: 7965096 Function Evaluation Descriptor Rationale Wildlife Habitat The wetland provides One Cowardin wetland class with more than 5 habitat for some wildlife plant species. Emergent veg. or wet meadow. species. Low degree of Cowardin class interspersion. Less than 0.5 acre of unvegetated open vvater present. Wetland connected to another body of water by surface water. Wetland connected to other wetlands within a 3 mile radius. Upstream not listed as water quality lirnited. Agricultural land use within 500 feet of wetland edge. Fish Habitat - Streams The wetland's fish habitat Less than 50% of stream shaded by riparian function is impacted or vegetation. Portions of stream channel degraded. modified. Stream contains less than 10% of instream structures. Upstream not listed as water quafity limited. Agricuftural land use within 500 ft of wetland edge. Salmon, trout, or sensitive species present sometime during the year. Fish Habitat - Lakes/Ponds N/A Water Quality The wetland's water quality Surface flow (including streams and ditches) function is impacted or is wetland's primary source of water. Unable degraded. to determine evidence of flooding or ponding during the growing season (or unapplicable). Moderate (approx. 60%) degree of wetland vegetation cover. Between 0.5 and 5 acres of wetland connected to other wetlands within a 3 mile radius_ Agricultural land use within 500 feet of wetland edge. Upstream not listed as water quality limited in watershed or adjacent to the wetland. Hydro%gic Control Sensitivity to Impact The wetland's hydrologic control function is impacted or degraded. The wetland is potentially sensitive to future impacts No part of wetland loc2ted within 100-year floodplain or enclosed basin. Unable to determine evidence of flooding or ponding during the growing season (or not applicable). Area is less than 0.5 acre. Waterflow out of wetland is unrestricted. Emergent veg. or wet meadow is dominant cover type. Agricultural land use within 500 ft of wetland on downstream or down-slope edge of wetland. Agricultural land use in watershed upstream from area. Stream flow or bank has been modified by human activities within 1 rnile above wetland. Water is not being taken out of streams through active diking, drainage, or irrigation districts upstream. Upstream not listed as water quality limited in watershed upstream of the or adjacent to the wetland. Agricultural land use within 500 feet of wetland's edge. . Dominant Agricuftural land use within 500 feet of wetland's edge. Emergent veg. only or wet rneadow is the dominant cover. Fnhanr.pmPnt PntPntial OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Function and Condition Summary Sheet for the Oregon Method WetlandCode: EC-7 ProjectNumber: 7965096 Function Evaluation Descriptor Rationale The wetland has little Wetland has lost one or more functions or enhancement potential. one or more functions is not present in assessment results for wildlife habitat, fish habitat, water quality and hydrologic control. Wetland's primary source of water is surface flow, including streams and ditches. Water flow into wetfand is not restricted, but if blocked, obstruction can be removed easily. Wetland's area is less than 0.5 acre. Less than 10% of wetland's edge is bordered by a vegetative buffer 25 or more feet wide. ` Wetland is potentially sensitive to future impacts. Education The wetland site is not Wetland site is not open to the public for appropriate for educational direct access or observation. There are no use. visible hazards to the public at the wetland site. Provides wildlife habitat for some species, or fish habitat is impacted or degraded. There is no existing physical public access to other features, and observation of other features cannot be made. There is not an existing access point within 250 feet of the wetland's edge (if existing-hazardous). Access is not available for limited mobility. Recreation The wetland has the There is not an existing access point within potential to provide 250 feet of the wetland's edge (if existing- recreational opportunities. hazardous). Boat launch could be developed within 0.5-1 mile. Existing undeveloped trails and viewing ares to guide user. Wetland provides habitat for some species. Fishing is not allowed at wetland or adjacent water body (or not applicable). Hunting is not allowed at the wetland. Aesthetic Quality The wetland is considered One Cowardin class is visible from primary to be moderately pleasing. viewing area(s). More than 50% of wetland is visible from viewing area(s). General appearance of wetland has no visual detractors. Visual character with surrounding area is landscaped or manipulated by people. Natural, pleasant odors are present at primary viewing location. Some traffic and other similar sounds and natural sounds are audible at primary viewing locations. Silverton Wetiands of Special lnterest for Protection Assessment Answer Sheet WetlandCode: EC-7 Question 1 B List: Question 2 B Lisfi Question 3 B List: Question 4 B List: Question 5 B Question 6 B Question 7 B List: Question 8 B Question 9 B Question 10 B Shapiro and Associates, Inc., 1650 N.W. Naito Parkway, Suite 302, Portland, Oregon 97209 Project Number: 7965096 Silverton Local Wetland Significance Assessment WetlandCode: EC-7 A, "OUT" Test No Wetlands artificially CREATED ENTIRELY FROM UPLAND that are: (a) created for the purpose of contrQlling, storing, or maintaining stormwater; (b) active surface mining ponds; (c) ditches without free and open connection to waters of the state AND without fish; (d) <1 acre and unintentionally created from irrigation leak or construction activity; (e) of any size and created for the purpose of wastewater treatment, stock watering, settling of sediment, cooling industriat water, or as a golf course hazard. No Documented as being contaminated by hazardous substances, materials or wastes ("Hazmat sites"). This wetland does NO T meet the criteria for identification as a Local Significant Wetl B. "IN" No Wetlands that score the highest rank for ANY of the four ecologicai functions addressed by OFWAM or equivalent methodology: No wildlife habitat, No fish habitat, No water quality, No hydrologic control. No Wetlands that (1) are rated in either the highest or second highest category for water quality (in OFWAM or equivalent) AND that (2) the wetland is within one-quarter mile from a water quality- limited stream as listed by DEQ. No Contains one or more rare wetland plant communities including those listed in the Oregon Natural Heritage Program's CLASSIFICATION AND CATALOG OF NATIVE WETLAND PLANT COMMUNITIES IN OREGON as G1-G3 and S1-S3. No Inhabited by any species listed by the federal or state government as a sensitive, threatened or endangered species in Oregon (unless consultation with appropriate agency deems the site not important for the maintenance of the species. No Wetland rates in either the highest or second highest category for Fish Habitat in OFWAM and is located adjacent to a stream segment that is mapped by ODFW as habitat for "Indigenous anadromous salmonids." No OPTIONAL CRITERION (at discretion of local government): Wetland represents a LOCALLY unique plant communiry. No OPTIONAL CRITERION (at discretion of local government): Wetland is publicly owned, rates highest rank for education potential, and there is documented use for educational purposes by a school or organization. Shapiro and Associates, Inc., 1650 N.W. Naito Parkway, Suite 302, Portland, Oregon 97215 Project Number: 7965096 �. j _ ��' . � �� .� � SILVERTON LOCAL WETLANDS INVENTORY - Wetland Summary Sheet - Date(s) of Field Verification: 9/23/98 Wetland Mapping Code: EC-8 Investigator(s): JG Size (acres): 0.24 Location Legal: T6S, R1 W, S26 3700 Other: 600 feet S. of Hobart Rd.; 600 ft E. of Webb Lake Basin: Evans Creek Soils : Mapped Series: Amity silt loam Hydrology Hydrologic Source: Precipitation, groundwater Wetland Classification(s): PEM dominant Vegetation Trees Shrubs Vines Herbs Comments: OFFSITE DETERMINATION. EC-8 is a small, isolated wetland in an actively farmed agricultural field. It was delineated by Pacific Habitat Services. Further information about the site is available in the PHS delineation report. Wetland Classification Codes: , PFO = palustrine forested PSS = palustrine scrub-shrub RSB = riverine streambed (intermittent) PEM = palustrine emergent POW = palustrine open water RUB = riverine unconsolidated bottom SHAPIRO Project Number. 7965096 OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Date(s): 9/23/98 Investigator(s): JG Project Name: City of Silverton WetlandCode: EC-8 ProjectNumber: 7965096 Wildlife Fish Habitat Habitat Streams Q1: C Q1: Q2: C Q2: Q3: C Q3: Q4: C Q4: Q5: B Q5: Q6: B Q6: Q7: A Q8: C Q9a: Q9b: C Q1: B Q2: C Q3: Q4: C QSa: Q5b: C Q6: B Fish Habitaf Water ' Lakes/Ponds Quality Q1: Q1: Q2: Q2: Q3: Q3: Q4: Q4: Q5: Q5: Q6: Q6: Q1: Q2: Q3: Q4: Q5: Q6: C A B C C B Q1: Q2: Q3: Q4: Q5: Q6: B B C C A C Hydrologic Sensitivity to Control Impact Q1: B Q1: A Q2: B Q2: A Q3: C Q3: C Q4: C Q4: A Q5: C Q5: A Q6: A Q6: B Q7: A C Q1 C Q2 C Q3 B Q4 B Q5 B Q6 C A C C A A OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Function and Condition Summary Sheet for the Oregon Method WetlandCode: EC-8 ProjectNumber: 7965096 Function Evaluation Descriptor Rationale Wildiife Habitat The wetland provides habitat for some wildlife species. One Cowardin wetland class with 5 or fewer plant species. Emergent veg. or wet meadow. Low degree of Cowardin class interspersion. Less than 0.5 acre of unvegetated open water present. Wetland not connected to another body of water, but water within 1 mile. Wetland not connected to other wetlands,.but within 3 mile radius of other wetlands. Upstream not listed as wate_r quality limited. Residential/Industrial land use within 500 feet of wetland edae. Fish Habitat - Streams Fish Habitat - Lakes/Ponds N/A N/A Water Quality The wetland's water quality Precipitation or sheet flow is wetland's function is impacted or primary source of water. Unable to determine degraded. evidence of flooding or ponding during the growing season (or unapplicable). Low (<60%) degree of wetland vegetation cover. Less than 0.5 acre and wetland is not connected to other wetland within a 3 mile radius. Residential/Industrial land use within 500 feet of wetland edge. Upstream not listed as water quality limited in watershed or adjacent to the wetland. Hydrologic Control The wetland's hydrologic No part of wetland located within 100-year control function is impacted floodplain or enclosed basin. Unable to or degraded. determine evidence of flooding or ponding during the growing season (or not applicable). Area is less than 0.5 acre. Waterflow out of wefland is unrestricted. Emergent veg. or wet meadow is dominant cover type. � Residential/Industrial land use within 500 ft of wetland on downstream or down-slope edge of wetland. Urban or Urbanizing land use in watershed upstream from area. Sensitivity to lmpact The wetland is poYentially Stream flow or bank has been modified by sensitive to future impacts human activities within 1 mile above wetland. Water is being taken out of stream(s) through active diking, drainage, or irrigation districts upstream. Upstream not listed as water quality limited in watershed upstream of the or adjacent to the wetland. Residential/industrial (developed) land use within 500 feet of wetland's edge. Dominant Residential/Industrial (developed) land use within 500 feet of wetland's edge. Emergent veg. only or wet meadow is the dominant cover. Enhancement Potential The wetland has little Wetland has lost one or more functions or enhancement potential. one or more functions is not present in assessment results for wildlife habitat, fish habitat, water quality and hydrologic control. OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Function and Condition Summary Sheet for the Oregon Method WetlandCode: EC-8 ProjectNumber: 7965096 Funct'ion Evaluation Descriptor Rationale Wetland's primary source of water is precipitation or sheet flow. Wetland's area is less than 0.5 acre. Less than 10% of wetland's edge is bordered by a vegetative buffer 25 or more feet wide. Wetland is potentially sensitive to future impacts. Education The wetland site is not Wetland site is not open to the public for appropriate for educational direct access or observation. There are no use. visible hazards to the public at the wetland site. Provides wildlife habitat for some species, or fish habitat is impacted or degraded. There is no existing physical public access to other features, and observation of other features cannot be made. There is not an existing access point within 250 feet of the wetland's edge (if existing-hazardous). Access is not available for limited mobility. Recreation The wetland is not There is not an existing access point within appropriate for or does not 250 feet of the wet{and's edge (if existing- provide recreational hazardous). Wetland not accessible by boat- opportunities. no boat launch within 1 mile/ cannot develop. No existing trails and viewing areas to guide user or if created, would disrupt wildlife or plant habitat. Wetland provides habitat for some species. Fishing is not allowed at wetland or adjacent water body (or not applicable). Hunting is not allowed at the wetland. Aesthetic Quality The wetland is not pleasing. One Cowardin class is visible from primary viewing area(s). More than 50% of wetland is visible from viewing area(s). General appearance of wetland has visual detractors which cannot be removed easily. Visual character with surrounding area is developed with no landscaping. Natural, pleasant odors are present at primary viewing location. Some traffic and other similar sounds and natural sounds are audible at primary viewing locations. Silverton Wetiands of Special interest for Protection Assessment Ans Sheet WetlandCode: EC-8 Question 1 B List: Question 2 B List: Question 3 B List: Question 4 B List: Question 5 B Question 6 B Question 7 B List. Question 8 B Question 9 B Question 10 B Shapiro and Associates, Inc., 1650 N.W. Naito Parkway, Suite 302, Portland, Oregon 97209 Project Number: 7965096 Silverton Loca{ Wetland Significance Assessment WetlandCode: EC-8 A. "OUT" Test Yes Wetlands artificially CREATED ENTIRELY FROM UPLAND that are: (a) created for the purpose of controfling, storing, or maintaining stormwater; (b) active surface mining ponds; (c) ditches without free and open connection to waters of the state AND without fish; (d) <1 acre and unintentionally created from irrigation leak or construction activity; (e) of any size and created for the purpose of wastewater treatment, stock watering, settling of sediment, cooling industrial water, or as a golf course hazard. No Documented as being contaminated by hazardous substances, materials or wastes ("Hazmat sites") This wetland does NOT meet the criteria for identification as a Local Significant Wetland Shapiro and Associates, Inc., 1650 N.W. Naito Parkway, Suite 302, Portland, Oregon 97215 Project Number: 7965096 . .. .i , ' . . � . . � ' � " � � . � . . - �., . . � . � . . . � � , . . � . . SILVERTON LOCAL WETLANDS INVENTORY - Wetland Summary Sheet - Date(s) of Field Verification: N/A Wetland Mapping Code: EC-9 Investigator(s): JG Size (acres): 12.32 Location Legal: T6S, R1 W, S26 200, 500, 600, 700, 800, 900 Other: Silverton Industrial Park, Olson Rhododendron Farm Basin: Evans Creek Soils Mapped Series: Dayton silt loam Hydrology ' Hydrologic Source: Surface flow Wetland Classi#ication(s): PEM Dominant VegetatiQrr Trees - Shrubs Yines Herbs Salix sp. Rubus discolor Phalaris arundinacea Typha latifolia Comments: � = : EC-9 is a wetlands enhancement mitigation project (RF 7524 and RF 8075) in the Silverton Industrial Park. The mitigation site is surrounded by previously existing wetland (EC-4). Water for the wetland is supplied by a flow from the south, and west (along the eastern and northern edges of a rhododendron nursery) and the east (along the northern edge of a pasture). Wetland Classification Codes: PFO = palustrine forested PSS = palustrine scrub-shrub RSB = riverine streambed (intermittent) PEM = palustrine emergent POW = palustrine open water RUB = riverine unconsolidated bottom SHAPIRO Project Number. 7965096 OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Date(sj: 6/11/98 Project Name: City of Silverton WetlandCode: �C-4/EC-9 Wildlife Habitat Q1: Q2: Q3: Q4: Q5: Q6: Q7: Q8: Q9a: Q9b: Investigator(s): �DC/JG ProjectNumber: Fish Habitat Fish Habitat Streams Lakes/Ponds A Q1: A Q1: C Q2: C Q2: B Q3: B Q3: C Q4: A Q4: A Q5: C Q5: A Q6: C Q6: A C A Water Quality Q1: Q2: Q3: Q4: Q5: Q6: Hydrologic Sensitivity to Control Impact A Q1: B Q1: A A Q2: A Q2: A A Q3: A Q3: C A Q4: A Q4: A A Q5: C Q5: A C Q6: A Q6: B Q7: A Enhancement __- Education ' - Recreation Aesthetic- Potential- _ Quality Q1: A Q1: C Q1: A Q1: A Q2: A Q2: A Q2: C Q2: A Q3: A Q3: B Q3: C Q3: A Q4:.. `A Q4: G Q4: B Q4: B Q5a: Q5: A Q5: B Q5: A Q5b: A Q6: B Q6: B Q6: A Q6: B OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Function and Condition Summary S h e et for th Oregon Method WetlandCode: EC-4/EC-9 ProjectNumber: 7965096 Function Evaluation Descriptor Rationale Wildiife Habitat The wetland provides Two or more Cowardin wetiand classes. habitat for some.wildlife Emergent veg. or wet meadow. Moderate species. degree of Cowardin class interspersion. Less . than 0.5 acre of unvegetated open water present. Wetland connected to another body . of water by surface water. Wetland connected to other wetlands within a 3 mile radius. Upstream not listed as water quality limited. Residential/Industrial land use within 500 feet of wetland edge. More than 40% of wetland . edge bordered by veg. buffer 25 or more feet wide. Fish Habitat - Streams The wetland's fish habitat Mare than 75°l0 of stream shaded by riparian function is impacted or vegetation. Physical character of stream degraded. channel extensively modified/piped. Stream contains between 10 and 25% of instream structures. Upstream not listed as water quality limited. Residential/Industrial fand use within 500 feet of wetland edge: No fish species present during the year. Fish Habitat - Lakes/Ponds N/A � Water Quality The wetland's water quality Surface flow (including streams and ditches) . function is intact, is wetland's primary source of water. Evidence of flooding or ponding during part of the growing season. High (>60%) degree of wetland vegetation cover. More than 5 acres of wetland area. Residential/Industrial land use within 500 feet of wetland edge. Upstream not listed as water quality limited in watershed or adjacent to the wetland. Hydrologic Control The wetland's hydrologic No part of wetland located within 100-year control function is intact. floodplain or enclosed basin. Evidence of flooding or ponding during the growing season. Area is more than 5 acres. Waterflow out of wetfand is restricted or no outlet: Emergent veg. or wet meadow is dominant cover type. Residential/Industrial land use within 500 ft of wetland on downstream or down-slope edge of wetland. Urban or. � Urbanizing land use in watershed upstream from area. Sensitivity to lmpact The wetland is potentially sensitive to future impacts Stream flow or bank has been modified by human activities within 1 mile above wetland. Water is being taken out of stream(s) through active diking, drainage, or irrigation districts upstream. Upstream not listed as water quality limited in watershed upstream of the or adjacent to the wetland. Residential/industrial (developed} land use within 500 feet of wetland's edge. Dominant Residential/Industrial (developed) land use within 500 feet of wetland's edge. Emergent OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Function and Condition S ummary Sheet for the Oreg Method WetlandCode: EC-4/EC-9 . ProjectNumber: 7965096 Function Evaluation Descriptor Rationale veg. only or wet meadow is the dominant cover: Enhancement Potenfial The wetiand has high One or more of functions for assessment enhancement potential. results for wildlife habitat, fish habitat, water quality and hydrologic control is impacted or � degraded. Wetland's primary source of water is surFace flow, including streams and ditches. Water flow into wetland is not restricted, but if blocked, obstruction can be removed easily. Wetland's area is more than 5 acres. More than 40% of wetland's edge is bordered by a vegetative buffer 25 or more feet wide. Wetland is potentially sensitive to future impacts. Education The wetland site is not Wetland site•is not open to the public for appropriate for educational direct access or observation. There are no use. visible hazards to the public at the wefland site. Provides wildlife habitat for some species, or fish habitat is impacted or � degraded. There is no existing physical public access to other features, and observation of other features cannot be made. There is a maintained public access point within 250 feet of the wetland's edge. Access is not available for limited mobility. Recreation The wetland has the There is a maintained public access point potential to provide within 250 feet of wetland's edge. Wetland not recreational opportunities. accessible by boat-no boat launch within 1 mile/ cannot develop. No existing trails and viewing areas to guide user or if created, would disrupt wildlife or plant habitat. Wetland provides habitat for some species. Fishing is . not allowed at wetland or adjacent water body (or not applicable). Hunting is not allowed at the wetland. Aesthetic Quality The wetland is considered More than two Cowardin classes are visible ° to be pleasing. from primary viewing. area(s). More than 50% of wetland is visible from viewing area(s). General appearance of wetland has no visual detractors. Visual character with surrounding area is landscaped or manipulated by people. Natural, pleasant odors are present at primary - viewing location. Some tra�c and other similar sounds and natural sounds are audible at primary viewing locations. . Silverton Wetlands of Special Interest for Protection Assessment Answer Sheet WetlandCode: EC-4/EC-9 This is potentially a Wetland of Special Interest for Protection. Question 1 B List: Question 2 B List: Question 3 B List: Question 4 B List: Question 5 B Question 6 B Question 7 B List: Question 8 A Question 9 B Question 10 B � Shapiro and Associates, Inc., 1650 N.W. Naito Parkway, Suite 302, Portland, Oregon 97209 Project Number: 7965096 Silverton Local Wetland Significance Assessment WetlandCode: EC-4/EC-9 A. "OUT" Test No Wetlands artificially CREATED ENTIRELY FROM UPLAND that are: (a) created for the purpose of controlling, storing, or maintaining stormwater; (b) active surface mining ponds; (c) ditches without free and open connection to waters of the state AND without fish; (d) <1 acre and unintentionally created from irrigation leak or construction activity; (e) of any size and created for the purpose of wastewater treatment, stock watering, settling of sediment, copling industrial water, or as a golf course hazard. No Documented as being contaminated by hazardous substances, materials or wastes ("Hazmat sites"). This wetland d oes NOT meet the criteria for identification as a Local Significant Wetland B. "IN" No Wetlands that score the highest rank for ANY of the four ecological functions addressed by OFWAM o� equivalent methodology: No wildlife habitat, No fish habitat, Yes water quality, Yes hydrologic control. No Wetlands that (1) are rated in either the highest or second highest category for water quality (in OFWAM or equivafent) AND that (2) the wefland is within one-quarter mi[e from a water quality- limited stream as listed by DEQ. No Contains one or more rare wetland plant communities including those listed in the Oregon Natural Heritage Program's CLASSIFICATION AND CATALOG OF NATIVE WETLAND PLANT COMMUNITIES IN OREGON as G1-G3 and S1-S3. No Inhabited by any species listed by the federal or state government as a sensitive, threatened or endangered species in Oregon (un[ess consultafion with appropriate agency deems the site not important for the maintenance of the species. No Wetland rates in either the highest or second highest category for Fish Habitat in OFWAM and is located adjacent to a stream segment that is mapped by ODFW as habitat for "Indigenous anadromous salmonids." No OPT]ONAL CRITERION (at discretion of local government): Wetland represents a LOCALLY unique plant community. No OPTIONAL CRITERION (at discretion of local government): Wetland is publicly owned, rates highest rank for education potential, and there is docurnented use for educational purposes by a school or organization. Shapiro and Associates, Inc., 1650 N.W. iVaito Parkway, Suite 302, Portland, Oregon 97215 Project Number: 7965096 SILVERTON LOCAL WETLANDS INVENTORY - Wetland Summary Sheet - Date(s) of Field Verification: 06/10/98 Wetland Mapping Code: OG-1 Investigator(s): DC/ JG Size (acres): 0.82 Location � Legal: T6S, R1 W, S34 400, 1700 Other: SW corner of Robert Frost Elem. Sch. Grounds Basin: Oregon Garden Soils _ Mapped Series: Amity silt loam Hydrolagy '; Hydrologic Source: Surface flow in stream Wetland Classification(s): RUB perennial; PFO; PEM Dominant Negetation ' Trees Shrubs Vines Herbs Holcus lanatus Galium aparine Comments: Wetland OG-1 is a stream and associated palustrine wetland/riparian complex. Data point 6 was located in the stream channel, with very little vegetation. Plants on the margin of the stream include Fraxinus latifolia (Oregon ash), Oemlaria cerasiformis (Indian plum), Rosa pisocarpa (clustered rose) Rubus laciniatus (evergreen blackberry), Rubus ursinus (trailing blackberry), Solanum dulcamara (climbing nightshade), Symphoricarpos albus (snowberry), Quercus garryana (Oregon white oak) and Rhamnus purshiana (cascara). The stream channel is about 5 feet wide, shallow (3 inches of water at the time of investigation), and has a low gradient and braided side channels. A palustrine emergent wetland about 20 feet wide is adjacent to the northern bank of the stream. Wetland Classification Codes: PFO = palustrine forested PSS = palustrine scrub-shrub RSB = riverine streambed (intermittent) PEM = palustrine emergent POW = palustrine open water RUB = riverine unconsolidated bottom SHAPIRO Project Number. 7965096 WETLAND DETERMINATION DATA SHEET -1987 MANUAL ClienUApplicant: C'itv of Silverton Site: Robert Frost Elem. Sch. Plot: 6 T� R 1 W S 34 City: Silverton � County: Marion State: OR Plot Location; Topography S.W. corner of Robert Frost Elem Sch. grounds; in stream channel Project #: 7965096.1 Determined by: Date: DETERMINATION: IS THIS PLOT IN A WETLAND?: Yes Comments: Wetland meadow along N edge of channel, �20' wide. Do Normal Circumstances exist on the site? Yes Are Soils ❑ Vegetation ❑ Hydrology ❑ significantly disturbed? No EGETATION� Dominant.Plant Species Ind. %Cover: Ind. %Cover: Herb Stratum -% total cover. 80 ShrublSaalinq Stratum -% total cover: 0 Holcus lanatus FAC 80 Galium aparine FACU 20 Woodv Vine Stratum -% total cover: 0 Tree Stratum -% total cover: 0 Percent of Dominant Species that are OBL, FACW, or FAC (excluding FAC-) 1 of 2 = 50 %(50/20 Rule) Remarks: channel unvegetated. Surrounding veg. is; Fraxinus latifolia; Oemleria cerasiformis; Rosa pisocarpa; Rubus laciniatus, Rubus ursinus; Solanum dulcamara; Suvularia Aquatica; Quercus garryana; Cascara Amity silt loam FIELD SOIL CHARACTERISTICS: Horizon Depth Matrix Color Redox Abundance, Size, Color Texture, Structure, Other 0-10" 10 yr 3/2 clayey silt loam 10-18" 7.5 yr 3/2 silty clay loam ❑ Histosol ❑ Prob. Aquic moisture regime ❑ Redox features ❑ Organic streaking ❑ Histic epipedon ❑ Reducing conditions ❑ Concretions ❑ Organic pan ❑�Sulfidic odor ❑ Gleyed ❑ Highly organic surface layer ❑ On hydric soils list Remarks: Sloping thin soils, over a relatively impermeable sublayer, that stays saturated without showing strong reducing conditions. Soil Criterion Met? No Depth of inundation 2"-3" Depth to water table: 0" Depth to saturation: 0"-10" Primary Indicators: Secondary Indicators (2 or more required): ❑ Inundated ❑ Oxidized rhizospheres ❑ Local soil survey data ❑ Saturated in upper 12" ❑ Water-stained leaves ❑ FAC-Neutral test ❑ Water marks ❑ Recorded data (aerials, groundwater data) ❑ Drift lines Explain: ❑ Sediment deposits ❑ Other ❑ Drainage patterns� Explain: Remarks: Saturation in top 10" only. Channel4'-5' wide; some broided side channels. H:ydrology Criterion Met? ` Yes Shapiro and Associates, Inc. 1650 N.W. Naito Parkway, Suite 302 Portland, OR 97209 (503) 274-9000 Drainage Class: Somewhat poorly drained Taxonomy: Fine, Silty, Mixed, Mesic AQriaquic Xeric Agriabolls WETLAND DETERMINATION DATA SHEET -19$7 MANUAL Client/Applicant: Citv nf Silve�ton Site: Robert Frost Elem. Sch. Plot: 7 T 6S R 1W S�_ City: Silverton � County: Marion State: OR Plot Location; Topography In field N of plot C#6; SW corner RF Elem. Gentle slope Project #: 7965096.1 Determined by: DC/ Date: 6/10/98 DETERMINATION: IS THIS PLOT IN A WETLAND?: No Do Normal Circumstances exist on the site? yes Are Soils ❑ Vegetation ❑ Hydrology ❑ significantly disturbed? No VEGETATION Dominant Plant Species Ind. %Cover: Ind. %Cover: Herb Stratum -% total cover: l00 Shrub/Saplinq Stratum -% total cover: 0 Holcus lanatus FAC 60 Galium aparine FACU 40 Vicia sativa UPL 10 Cirsium arvense FACU 1 Woodv Vine Stratum -% total cover: 0 Tree Stratum -% total cover: 0 Percent of Dominant Species that are OBL, FACW, or FAC (excluding FAC-) 1 of 2 = 5p %(50/20 Rule) Vegetation Criterion Met? No SOILS Mapped Unit Name: Amity silt loam Drainage Class: Somewhat noorlv drained Taxonomy: Fine, silty, mixed, mesic Agriaquic Xeric AQriabolls FIELD SOIL CHARACTERISTICS: Horizon Depth Matrix Color Redox Abundance, Size, Cotor Texture, Structure, Other 0-18+" 7.5 YR 3/2 silty clay loam ❑ Histosol ❑ Prob_ Aquic moisture regime ❑ Redox features ❑ Organic streaking ❑ Histic epipedon ❑ Reducing conditions ❑ Concretions ❑ Organic pan ❑ Sulfidic odor ❑ Gleyed ❑ Highly organic surface layer ❑ On hydric soils list Soil Criterion Met? No HYQROLQGY Depth of inundation N/A Depth to water table: >18" Depth to saturation: >18" Primary Indicators: Secondary Indicators (2 or more required): ❑ Inundated ❑ Oxidized rhizospheres ❑ Local soil survey data ❑ Saturated in upper 12" ❑ Water-stained leaves ❑ FAC-Neutral test ❑ Water marks ❑ Recorded data (aerials, groundwater data) ❑ Drift lines Explain: ❑ Sediment deposits ❑ Other ❑ Drainage patterns Explain: Hydrology Criterion Met? No Shapiro and Associates, Inc. 1650 N.W. Naito Parkway, Suite 302 Portland, OR 97209 (503) 274-9000 OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Date(s): 6/10/98 Investigator(s): DC/JG Project Name: City of Silverton WetlandCode: OG-1 ProjectNumber; 7965096 Wiidlife Fish Habitat Fish Habitat Water Habitat Streams LakeslPonds Quality Q1: A Q1: A Q1: Q1: Q2: A Q2: A Q2: Q2: Q3: C Q3: A Q3: Q3: Q4: C Q4: A Q4: Q4: Q5: A Q5: B Q5: Q5: Q6: A Q6: C Q6: Q6: Q7: A Q8: B Q9a: Q9b: A Q1: B Q2: . A Q3: A Q4: A Q5a: Q5b: B Q6: B Q1: Q2: Q3: Q4: Q5: Q6: B A B B B B Q1: Q2: Q3: Q4: Q5: Q6: , Hydrologic Control Q1: B Q2: A Q3: B Q4: C Q5: A Q6: B Q7: A A A A B B C B Q1: C Q2: B Q3: B Q4: B Q5: B Q6: B C A B A A Sensitivity to Imp Q1: A Q2: B Q3: C Q4: B Q5: A Q6: C � OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Function and Condition Summary Sheet for the Oregon Method WetlandCode: OG-1 ProjectNumber: 7965096 Function Evaluation Descriptor Rationale Wildlife Habitat The wetland provides habitat for some wildlife species. Two or more Cowardin wetland classes. Woody vegetation is dominant vegetation cover. Low degree of Cowardin ciass interspersion. Less than 0.5 acre of unvegetated open water present. Wetiand connected to another body of water by surface water. Wetland connected to other wetlands within a 3 mile radius. Upstream not listed as water quality limited. Agricultural land use within 500 feet of wetland edge. More than 40% of wetland edge bordered by veg. buffer 25 or more feet wide. Fish Habitat - Streams The wetland's fish habitat More than 75% of stream shaded by riparian function is intact. vegetation. Stream channel natural/returning to natural physical character. Stream contains more than 25% of instream structures. Upstream not listed as water quality limited. Agricultural land use within 500 ft of wetland edge. No fish species present during the year. Fish Habitaf - Lakes/Ponds N/A � Water Quality The wetland's water quality function is intact. Surface flow (including streams and ditches) is wetland's primary source of water. Evidence of flooding or ponding during part of the growing season. Fiigh (>60%) degree of wetland vegetation cover. Between 0.5 and 5 acres of wetland connected to other wetlands within a 3 mile radius. Agricultural land use within 500 feet of wetland edge. Upstream not listed as water quality limited in watershed or adiacent to the wetland: Hydrologic Control The wetland's hydrologic No part of wetland located within 100-year control function is impacted floodplain or enclosed basin. Evidence of or degraded. flooding or ponding during the growing season. Area is between 0.5 and 5 acres. Waterflow out of wetland is unrestricted. Woody vegetation is dominant cover type. Agricultural land use within 500 ft of wetland on downstream or down-slope edge of wetland. Urban or Urbanizing land use in watershed upstream from area. Sensitivity to Impact The wetland is potentially Stream flow or bank has been modified by sensitive to future impacts human activities within 1 mile above wetland. Water is not being taken out of streams through active diking, drainage, or irrigation districts upstream. Upstream not listed as water quality limited in watershed upstream of the or adjacent to the wetland. Agricultural land use within 500 feet of wetland's edge. Dominant Residential/Industrial (devefoped) land use within 500 feet of wetland's edge. Emergent veg. and ponding,or open water only are the dominant cover types. Fnhanr.Pmpnt PntPntial OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Function and Condition Summary Sheet for the Oregon M WetiandCocie: OG-1 ProjectNumber: 7966096 Funct'ion Evaluation Descriptor Rationale The wetland has moderate Wetland has lost one or more functions or potential for enhancement. one or more functions is not present in assessment results for wildlife habitat, fish habitat, wa#er quality and hydrologic control. Wetland's primary source of water is surface flow, including streams and ditches. Water flow into wetland is not restricted, but if blocked, obstruction can be removed easily. Wetland's area is more than 5 acres. Between , 10 and 40 % of wetland's edge is bordered by a vegetative buffer 25 or more feet wide. Wetland is potentia►!y sensitive to future impacts. Education The wetland has potential Wetland site is open to the public for direct for educational use. access or observation, but allowed only with permission. There are no visible hazards to the public at the wetland site. Provides wildlife habitat for some species, or fish habitat is impacted or degraded. There is no existing physical public access to other features, but observation of other features can be made. There is an unmaintained access point within 250 feet of the wetland's edge. Access is not available for limited mobility. Recreafion The wetland has the There is an unmaintained public access point potential to provide within 250 feet of the wetland's edge. Wetland recreational opportunities. not accessible by boat-no boat launch within 1 mile/ cannot develop. Exisfing undeveloped trails and viewing ares to guide user. Wetland provides habitat for some species. Fishing is not allowed at wetland or adjacent water body (or not applicable). Hunting is not allowed at the wetland. Aesthetic Quality The wetland is considered Two Cowardin classes are visible from to be moderately pleasing. primary viewing area(s). Less than 25% of wetland is visible from viewing area(s). General appearance of wetland has no visual detractors. Visual character with surrounding area is landscaped or manipulated by people. Natural, pleasant odors are present at primary viewing location. Some traffic and other similar sounds and natural sounds are audible at primary viewing locations. Silverton . Wetlands of Speciai Interest for Protection Assessment Answer Sheet WetlandCode: OG-1 Question 1 B � List: Question 2 B , List: Question 3 B List: Question 4 B List: Question 5 B Question 6 B Question 7 B List: Question 8 B Question 9 B � Question 10 B Shapiro and Associates, Inc., 1650 N.W. Naito Parkway, Suite 302, Portland, Oregon 97209 Project Number: 7965096 Silverton Local Wetland Significance Assessment WetlandCode: OG1 A. "OUT" Test No Wetlands artifcially CREATED ENTIRELY FROM UPLAND that are: (a) created for the purpose of controlling, storing, or maintaining stormwater; (b) active surface mining ponds; (c) ditches without free and open connection to waters of the state AND without fish; (d) <1 acre and unintentionally created from irrigation leak or construction activity; (e) of any size and created for the purpose of wastewater treatment, stock watering, settling of sediment, cooling industrial water, or as a golf course hazard. No Documented as being contaminated by hazardous substances, materials or wastes ("Hazmat sites"). This wetland does NOT meet the criteria for identification as a Local Significant Wetland B: ��N No Wetlands that score the highest rank for ANY of the four ecological functions addressed by OFWAM or equivalent methodology: No wildlife habitat, Yes fish habitat, Yes water quality, No hydrologic control. No Wetlands that (1).are rated in either the highest or second highest category for water quality (in OFWAM or equivalent} AND that (2) the wetland is within one-quarter mile from a water quality- limited stream as listed by DEQ. No Contains one or more rare wetland plant communities including those listed in the Oregon Natural Heritage Program's CLASSIFICATION AND CATALOG OF NATIVE WETLAND PLANT COMMUNITIES IN OREGON as.G1-G3 and S1-S3. No Inhabited by any species listed by the federal or state government as a sensitive, threatened or endangered species in Oregon (unless consultat€on with appropriate agency deems the site not important for the maintenance of the species. No Wetland rates in either the highest or second highest category for Fish Habitat in OFWAM and is focated adjacent to a stream segment that is mapped by ODFW as habitat for "fndigenous anadromous salmonids." No OPTIONAL CRITERION (at discretion of local government): Wetland represents a LOCALLY unique p{ant community. No OPTIONAL CRITERION (at discretion of local government): Wetland is pubficly owned, rates highest rank for education potential, and there is documented use for educational purposes by a school or organization. Shapiro and Associates, Inc., 1650 N.W. Naito Parkway, Suite 302, Portland, Oregon 97215 Project Number: 7965096 SILVERTON LOCAL WETLANDS INVENTORY - Wetland Summary Sheet - Date(s) of Field Verification: 06/10/98 Wetland Mapping Code: OG-2 Investigator(s): DC/JG Size (acres): 0.12 Location Legal: T6S, R1 W, S34 Other: 300 feet west of Cascade Highway Basin: Silver Creek Soils Mapped Series: Amity silt loam, McAlpin silty clay loam HydrologY Hydrologic.Source: Stream from O.G.C. Wettand Classification(s): RUB perennial Dominant Vegetation Trees Shrubs Vines Herbs Mimulus guttatus Cirsium vulgare Holcus lanatus Agrostis stolonifera Camments:: Wetland OG-2 is an apparently perennial stream flowing in an excavated, straightened channel through an agricultural field used by the Silverton High School Future Farmers of America program. The channel is about 18-24 inches deep and 5 feet wide. At the time of the study, maximum depth of water in the ditch was approximately 6 inches. The. field the ditcti is in did not present wetland vegetation characteristics. Vegetation listed above was within the banks of the ditch. The tops of the banks were dominated by Festuca arundinaceae (Kentucky fescue), Rosa pisocarpa (clustered rose), and Symphoricarpos albus (snowberry). Vegetation in the surrounding field consisted primarily of a variety of grasses and thistles. Wetland Classification Codes: PFO = palustrine forested PSS = palustrine scrub-shrub RSB = riverine streambed (intermittent) PEM = palustrine emergent POW = palustrine open water RUB = riverine unconsolidated bottom SNAPIRO Projecf Number.• 7965096 WETLAND DETERMINATION DATA SHEET -1987 MANUAL Client/Applicant: C;itv of Silverton Site: Robert Frost Elm Sch. Plot: 4 T 6S R 1W S� City: Silverton - County: Mariori State: OR Plot Location; Topography �300' W of Cascade Highway on School FFA land; in ditch Project #: Determined by: Date: 6/10/98 DETERMINATION: IS THIS PLOT IN A WETLAND?: Yes Comments: Ditch excavated - 1.5'-2' deep, 5' wide. Sloping thin soils, where downslope groundwater keeps soils saturated long enough to produce anaerobic conditions and reduced soils. Do Normal Circumstances exist on the site? Yes Are Soils ❑ Vegetation ❑ Hydrology ❑ significantly disturbed? No VEGETATION' Dominant Plant Species Ind. %Cover: Ind. %Cover: Herb Stratum -% total cover: 100 Shrub/Sanlina Stratum -% total cover: 0 Mimulus guttatus OBL 60 Agrirnonia striata FACU 20 Holcus lanatus FAC 20 Cirsium vulgare FACU 1 Woodv Vine Stratum -% total cover: 0 Tree Stratum -% total cover: 0 Percent of Dominant Species that are OBL, FACW, or FAC (excluding FAC-) 2 of 3 =�% (50/20 Rule) Remarks: Veg. in ditch, not surrounding. Veg. on bank dominated by Festuca arundinacea and Rosa pisocarpa + Symphoricarpos albus. Vegetation Criterion Met? Yes SOILS Mapped Unit Name: McAlpin silty clay loam Drainage Class: Moderately well drained + somewhat poorly drained Taxonomy: Fine, mixed, mesic Cumulic Ultic Haploxerolls FIELD SOIL. CHARACTERISTICS: Horizon Depth Matrix Color Redox Abundance, Size, Color Texture, Structure, Other 0- 10 YR 3/2 N/A silty clay loam ❑ Histosol ❑ Prob. Aquic moisture regime ❑ Redox features ❑ Organic streaking ❑ Histic epipedon ❑ Reducing conditions ❑ Concretions ❑ Organic pan ❑ Sulfidic odor ❑ Gleyed ❑ Highly organic surface layer ❑ On hydric soils list Remarks: Sloping thin soils, over a relatively impermeable sublayer, that stays saturated without showing strong reduction conditions SoifCriterion Met? No= Depth of inundation 3"-6" Depth to water table: 0" Depth to saturation: 0" Primary Indicatars: Secondary Indicators (2 or more required): ❑� Inundated ❑ Oxidized rhizospheres ❑ Local soil survey data ❑� Saturated in upper 12" ❑ Water-stained leaves ❑ FAC-Neutral test ❑ Water marks ❑ Recorded data (aerials, groundwater data) ❑ Drift lines Explain: ❑ Sediment deposits ❑ Other ❑� Drainage patterns Explain: Hydrology Criterion Met? Yes Shapiro and Associates, Inc. 1650 N.W. Naito Parkway, Suite 302 . Portland, OR 97209 (503) 274-9000 WETLAND DETERMINATION DATA SHEET -1987 MANUAL Client/Applicant: Citv of Silverton Site: Robert Frost Elem. ch. Plot: 5 T 6S R 1W S� City: Silverton County: Marion State: OR Plot Location; Topography 20' S of plot 4, in ag field - level Project #: 7965096.1 Determined by: DGJG Date: 6/10/98 DETERMINATION: IS THIS PLOT IN A WETLAND?: No Do Normal Circumstances exist on the site? Yes Are Soils ❑ Vegetation ❑ Hydrology ❑ significantly disturbed? PTo VEGETATION Dominant Plant Species Ind. %Cover: Ind. %Cover: Herb Stratum -% total cover: 100 Shrub/Saplinp Stratum -% total cover: 0 Holcus lanatus FAC 60 Festuca arundinacea FAC- 15 Cirsium arvense FACU 15 Rubus acaulis FAC+ 10 Woodv Vine Stratum -% total cover: 0 Tree Stratum -% total cover: 0 Percent of Dominant Species that are OBL, FACW, or FAC (excluding FAC-) �_ of _� = 100 %(50/20 Rule) Criterion Met? Yes Mapped Unit Name: McAlpin Silty Clay Loam Drainage Class: Moderatelv well drained + somewhat poorlv drained Taxonomy: Fine mixed mesic Cuxnlulic Ultic Haploxerolls FIELD SOIL CHARACTERISTICS: Horizon Depth Matrix Color Redox Abundance, Size, Color Texture, Structure, Other 0-5" 10 YR. 3/2 silty clay loam 5-18" 7.5 YR 3/2 silty clay loam ❑ Histosof ❑ Prob. Aquic moisture regime ❑ Redox features ❑ Organic streaking ❑ Histic epipedon ❑ Reducing conditions ❑ Concretions � Organic pan ❑ Sulfidic odor ❑ Gleyed ❑ Highly organic surface layer ❑ On hydric soils list Depth of inundation N/A Depth to water table: >18" Depth to saturation: >18" Primary Indicators: Secondary Indicators (2 or more required): ❑ Inundated ❑ Oxidized rhizospheres ❑ Local soil survey data ❑ Saturated in upper 12" ❑ Water-stained leaves ❑ FAC-Neutral test ❑ Water marks ❑ Recorded data (aerials, groundwater data) ❑ Drift lines Explain: ❑ Sediment deposits ❑ Other ❑ Drainage patterns Explain: Hydrology Criterion Met? No Shapiro and Associates, Inc. 1650 N.W. Naito Parkway, Suite 302 Portland, OR 97209 (503) 274-9000 Wiidiife Habitat Q1: B Q2: B Q3: C Q4: C Q5: A Q6: A Q7: A Q8: B Q9a: Q9b: B Fish Habitat �ish Habitat Streams Lakes/Ponds Q1: C Q1: Q2: C Q2: Q3: C Q3: Q4: A Q4: Q5: B Q5: Q6: C Q6: Q1: B Q2: A Q3: A Q4: B Q5a: Q5b: C Q6: B Q1: Q2: Q3: Q4: Q5: Q6: B A B B B B Water I Quality Q1: Q2: Q3: Q4: Q5: Q6: A A C G B C Q1: Q2: Q3: Q4: Q5: Q6: C Q1: C Q2: C Q3: B Q4: B Q5; B Q6: Hydrologic Sensitivity to Control Impact Q1: B Q1: A Q2: A Q2: B Q3: C Q3: C Q4: C Q4: B Q5: B Q5: A Q6: B Q6: B Q7: A C C A B A A OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Function and Condition Summary Sheet for the Oregon Method WetlandCode: OG-2 ProjectNumber: 7965096 Function Evaluation Descriptor Rationale Wildlife Habifat The wetland provides One Cowardin wetiand class with more than 5 habitat for some wildlife plant species. Emergent veg. & ponding or species. open water only. Low degree of Cowardin class interspersion. Less than 0.5 acre of unvegetated open water present. Wetland connected to another body of water by surface water. Wetland connected to other wetlands within a 3 mile radius. Upstream not listed as water quality limited. Agricultura! land ' use within 500 feet of wetland edge. Fish Habitat - Streams The wetland's fish habitat Less than 50% of stream shaded by riparian function is impacted or vegetation. Physical character of stream degraded. channel extensively modified/piped. Stream contains less than 10% of instream structures. Upstream not listed as water quality limited. Agricultural land use within 500 ft of wetland edge. No fish species present during the year. Fish Habitat - Lakes/Ponds N/A Water Quality The wetland's water quality Surface flow (including streams and ditches) function is impacted or is wetland's primary source of water. degraded. Evidence of flooding or ponding during part of the growing season. Low (<60%) degree of wetland vegetation cover. Less than 0.5 acre and wetland is not connected to other wetland within a 3 mile radius. Agricultural land use within 500 feet of wetland edge. Upstream not listed as water quality limited in watershed or adjacent to the wetland. Hydrologic Control The wetland's hydrologic No part of wetland located within 100-year control function is impacted floodplain or enclosed basin. Evidence of or degraded. flooding or ponding during the growing season. Area is less than 0.5 acre. WaterFlow out of wetland is unrestricted. Emergent veg. and ponding , or open water only is dominant cover type. Agricultural land use within 500 ft of wetland on downstream or down-slope edge of wetiand. Urban or Urbanizing land use in watershed upstream from area. Sensitivity to Impact The wetland is potentially Stream flow or bank has been modified by sensitive to future impacts human activities within 1 mile above wetland. Water is not being taken out of streams through active diking, drainage, or irrigation districts upstream. Upstream not listed as water quality limited in watershed upstream of the or adjacent to the wetland. AgricuEtural . land use within 500 feet of wetland's edge. Dominant Residential/Industrial (developed) Iand use within 500 feet of wetland's edge. Emergent veg. only or wet meadow is the dominant cover. Enhancement Potential The wetland has moderate Wetland has lost one or more functions or OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Function and Condition Summary Sheet for the Oregon Method WetlandCode: OG-2 ProjectNumber: 7965096 Function � Evaluation Descriptor � Rationale potential for enhancement. one or more functions is not present in assessment results for wildlife habitat, fish habitat, water quality and hydrologic control. Wetland's primary source of water is surface flow, including streams and ditches. Water flow into wetland is not restricted, but if blocked, obstruction can be removed easily. Wetland's area is between 0.5 and 5 acres. Less than 10% of wetland's edge is bordered by a vegetative buffer 25 or more feet wide. Wetland is potentially sensitive to future impacts. Education The wetland has potential Wetland site is open to the public for direct for educational use. access or observation, but allowed only with permission. There are no visible fiazards to , the public at the wetland site. Provides wildlife habitat for some species, or fish habitat is impacted or degraded. There is no existing physical public access to other features, but observation of other features can be made. There is an unmaintained access point within 250 feet of the wetland's edge. Access is not available for limited mobility. Recreation The wetland is not There is not an existing access point within appropriate for or does not 250 feet of the wetland's edge (if existing- provide recreational hazardous). Wetland not accessible by boat- opportunities. no boat launch within 1 mile/ cannot develop. No existing trails and viewing areas to guide user or if created, would disrupt wildlife o� plant habitat. Wetland provides habitat for some spe.cies. Fishing is not allowed at wetland or adjacent water body (or not applicable). Hunting is not allowed at the wetland. Aesthetic Quality The wetland is not pleasing. One Cowardin class is visible from primary viewing area(s). Less than 25% of wetland is visible from viewing area(s). General appearance of wetland has no visual detractors. Visual character with surrounding area is landscaped or manipulated by people. Natural, pleasant odors are present at primary viewing location. Some traffic and other similar sounds and natural sounds are audible at primary viewing locations. Silverton Wetlands of Special Interest for Protection Assessment Answer Sheet WetlandCode: OG-2 Question 1 B List: Question 2 B List: Question 3 B List: Question 4 B Lisf: Question 5 B Question 6 B Question 7 B List: Question 8 B Question 9 B Question 10 B Shapiro and Associates, Inc., 1650 N.W. Naito Parkway, Suite 302, Portland, Oregon 97209 Project Number: 7965096 Silverton Local Wetland Significance Assessment WetlandCode: OG-2 A. "'OUT" Test No Wetlands artificially CREATED ENTIRELY FROM UPLAND that are: (a) created for the purpose of controlling, storing, or maintaining stormwater; (b) active surface mining ponds; (c) ditches without free and open connection to waters of the state AND without fish; (d) <1 acre and unintentionally created from irrigation leak or construction activity; (e) of any size and created for the purpose of wastewater treatment, stock watering, settling of sediment, cooling industrial water, or as a golf course hazard. No Documented as being contaminated by hazardous substances, materials or wastes ("Hazmat sites"). This wetland does NOT meet the criteria for identification as a Local Significant Wetland B. , ��N�• No Wetlands that score the highest rank for ANY of the four ecological functions addressed by OFWAM or equivalent methodology: No wildlife habitat, No fish habitat, No water quality, No hydrologic control. No Wet�ands that (1) are rated in either the highest or second highest category for water quality (in OFWAM or equivalent) AND that (2) the wetland is within one-quarter mile from a water quality- limited stream as listed by DEQ. No Contains one or more rare wetland plant communities including those listed in the Oregon Natural Heritage Program's CLASSIFICATION AND CATALOG OF NATIVE WETLAND PLANT COMMUNITIES IN OREGON as G1-G3 and S1-S3. No Inhabited by any species listed by the federal or state government as a sensitive, threatened or endangered species in Oregon (unless consultation with appropriate agency deems the site not important for the maintenance of the species. No Wetland rates in either the highest or second highest category for Fish Habitat in OFWAM and is located adjacent to a stream segment that is mapped by ODFW as habitat for "Indigenous anadromous salmonids." No OPTIONAL CRITERION (at discretion of local government): Wetland represents a LOCALLY unique plant community. No OPTIONAL CRITERION (at discretion of local government): Wetland is publicly owned, rates highest rank for education potential, and there is documented use for educational purposes by a school or organization. Shapiro and Associates, Inc., 1650 N.W. Naito Parkway, Suite 302, Portland, Oregon 97215 Project Number: 7965096 SILVERTON LOCAL WETLANDS INVENTORY - Wetland Summary Sheet - Date(s) of Field Verification: 06/03/98 Investigator(s): DC/JG Wetland Mapping Code: OG-3 Size (acres): 5.56 Location Legal: T7S, R1 W, S3 Other: 200 yards west of Eureka Way Basin: Silver Creek 600, 700, 900, 1000 . Soiis - Mapped Series: McAipin silty clay loam, Witzel very stoney silt loam Hydr,ology ' Hydrotogic Source: Surface drainage (stream) from south Wetland Classification(s): PEM, RUB perennial Dominant Vegetation ' Trees Shrubs Vines Rubus discolor Herbs Mimulus guttatus Agrostis tenuis Conium maculatum Holcus lanatus Veronica americana Epilobium watsonii Asc%pias sp. Comments: Wetland OG-3 is a small, perenniai stream, pond, and associated palustrine emergent wetland in the bottom of a small drainage that flows into the eastern part of the Oregon Garden. The pond was formed by construction of an earthen dam across the stream. Vegetation (including wettand plants) has been removed mechanically from a broad area on both sides of the stream and pond. The area was used for many years as a horse pasture. The cleared upland area is being revegetated by opportunistic, generally weedy species. The stream channel has been altered by operation of heavy equipment. The channel in many places is shallow, braided, and heavily silted. Soil in this wetland is problematic; it does not develop or present typical hydric indicators. Wetland Classification Codes: PFO = palustrine forested PSS = palustrine scrub-shrub RSB = riverine streambed (intermittent) PEM = palustrine emergent POW = palustrine open water RUB = riverine unconsolidated bottom SNAPlRO Project Number.• 7965096 WETLAND DETERMINATION DATA SHEET -1987 MANUAL ClienUApplicant: (�itv of Silverton Site: Eureka Ave. Plot: 2 T 7S R 1W S 3 City: Silverton County: Marion State: OR Plot Location; Topography 200 yds. W of Eureka Way; E of O.G.C. in drainage swale Project #: 7965096.1 Determined by: DGJG Date: 6/3/98 DETERMINATION: IS THIS PLOT IN A WETLAND?:yes Comments: Sloping thin soils, where downslope groundwater keeps soils saturated long enough to produce anaerobic conditions and reduced soils. Do Normal Circumstances exist on the site? �o Explanation: Area has been cleared with in last year. Are Soils� Vegetation � Hydrology ❑ significantly disturbed? Yes Explanatio So ha been scraped. VEGETATION' Dominant Plant Species Ind. % Cover: Ind. % Cover: Herb Stratum -% total cover: 90 Shrub/Saqlin� Stratum -% total cover: 0 Agrostis tenuis FAC 40 Mimulus guttatus OBL 40 Conium maculatum FAC+ 10 Holcus lanatus FAC Woodv Vine Stratum -% total cover: lo Tree Stratum -% total cover: 0 Rubus discolor FACU 100 Peresnt of Dominant Species that are OBL, FACW, or FAC (excluding FAC-) 2 of 3 = 67 %(50/20 Rule) Remarks: Area has been cleared w/in last year. Other minor species present include Asclepias speciosa, Epilobium watsonii, Veronica americana. Vegetation Criterian Met? Yes SOfLS Mapped Unit Name: Witzer very stony silt loam Drainage Class: Well drained Taxonomy: Loamy - skeletal, mixed, mesic, Lithic Ultic Haploxerolls FIELD SOIL CHARACTERISTICS: Horizon Depth Matrix Color Redox Abundance, Size, Color Texture, Structure, Other 0- 12" 7.5 YR. 3/2 12- 7.SYR3/4 ❑ Histosol ❑ Prob. Aquic moisture regime ❑ Redox features ❑ Organic streaking ❑ Histic epipedon ❑ Reducing conditions ❑ Concretions ❑ Organic pan ❑ Sulfidic odor ❑ Gleyed � ❑ Highly organic surtace layer ❑ On hydric soils list Remarks: Sloping thin soils, over a relatively impermeable sublayer, that stays saturated without showing strong reduction conditions Soil Criterion Met? - No HYDROLOGY Depth of inundation 1" Depth to water table: 0" Depth to saturation: 0" Primary �nd+cators: Secondary Indicators (2 or more required): � Inundated ❑ Oxidized rhizospheres ❑ Local soil survey data � Saturated in upper 12" ❑ Water-stained leaves ❑ FAC-Neutral test ❑ Water marks ❑ Recorded data (aerials, groundwater data) ❑ Drift lines Explain: ❑ Sediment deposits ❑ Other ❑ Drainage patterns Explain: Hydrology Criferion Met? Yes Shapiro and Associates, Inc. 1650 N.W. Naito Parkway, Suite 302 Portland, OR 97209 (503) 274-9000 WETLAND DETERMINATION DATA SHEET -1987 MANUAL Client/Applicant: Citv of Silverton Site: �ureka Ave. Plot: 3 T 7S R 1W S 3 City: Silverton - County: Marion State: OR Plot Location; Topography 20 yds N of #2 - 5' higher Project #: 7965096.1 Determined by: DC/JG Date: 6/3/98 DETERMINATION: IS THIS PLOT IN A WETLAND?: No Comments: Sloping thin soils, downslope GW keeps soils sat. enough to prod. anaerobic cond. & reduced soils. Do Normal Circumstances exist on the site? 1�To Explanation: Site cleared w/in last year. Are Soils ❑� Vegetation ❑� Hydrology � significantly disturbed? Yes E xplanation: Soil has been scraped. � VEGETATION Dominant Plant Species Ind. % Cover: Ind. % Cover: Herb Stratum -% total cover: 40 Shrub/Saplinq Stratum -% total cover: 0 Agrostis tenuis FAC 30 Conium maculatum FAC+ 20 Cirsium vulgare FACU 10 Festuca arundinacea FAC- 5 Dactylis glomerata FACU 1 Epilobium watsonii FACW 1 Vicia sativa UPL 1 Woodv Vine Stratum -% total cover: 60 Tree Stratum -% total cover: 0 Rubus discolor FACU 100 Percent of Dominant Species that are OBL, FACW, or FAC (excluding FAC-) 2 of 4 = 50 %(50/20 Rule) Remarks: Mustard sp. - very open, fine growth to � 2 m; 5% Vegetation Criterion Met? No; SOILS' Mapped Unit Name: Witzel very stony silt loam Drainage Class: Well drained Taxonomy: Loamy - skeletal, mixed, mesic Lithic Ultic Haploxerolls FIELD SOIL CHARACTERISTICS: Horizon Depth Matrix Color Redox Abundance, Size, Color Texture, Structure, Other 0-8" 7.5 YR 3/2 ❑ Histosol ❑ Prob. Aquic moisture regime ❑ Redox features ❑ Organic streaking ❑ Histic epipedon ❑ Reducing conditions ❑ Concretions ❑ Organic pan ❑ Sulfidic odor ❑ Gleyed ❑ Highly organic surface layer ❑ On hydric soils list Remarks: Refus. at 8"; rocks. Sloping thin soils, over a rel. imperm. sublayer, stays sat. w/o strong reduct. cond. Soil Criferion Met? Na° HYDROLOGY� Deptti of inundation N/A Depfh to water table: >S" Depth to saturation: >8" Primary Indicators: Secondary Indicators (2 or more required): ❑ Inundated ❑ Oxidized rhizospheres ❑ Local soil survey data ❑ Saturated in upper 12" ❑ Water-stained leaves ❑ FAC-Neutral test ❑ Water marks ❑ Recorded data (aerials, groundwater data) ❑ Drift lines Explain: ❑ Sediment deposits ❑ Other ❑ Drainage patterns Explain: Hydrology Criterion Met? No Shapiro and Associates, Inc. 1650 N.W. Naito Parkway, Suite 302 Portiand, OR 97209 (503} 274-9000 OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Date(s): 6/10/98 Investigator(s): DC/JG Project Name: City of Siiverton WetlandCode: OG-3 ProjectNumber: 7965096 Wildlife Fish Habitat Habitat Streams Q1: A Q1: A Q2: B Q2: A Q3: C Q3: C Q4: B Q4: A Q5: A Q5: A Q6: A Q6: C Q7: A Q8: A Q9a: Q9b: A Q1: N/A Q2: N/A Q3: N/A Q4: N/A Q5a: N/A QSb: N/A Q6: N/A Fish Habitat Lakes/Ponds Q1: A Q2: B Q3: C Q4: A Q5: A Q6: C Q1: Q2: Q3: Q4: Q5: Q6: A A A A B B Water Quality Q1: Q2: Q3: Q4: Q5: Q6: Q1 Q2 Q3 Q4 Q5 Q6 Hydrologic Control A Q1: B A Q2: A A Q3: A A Q4: C C Q5: B C Q6: C Q7: C 'I A Q1: C Q2: C Q3: A Q4: B Q5: ' B Q6: B C A B A A Sensitivity to Impact Q1: A Q2: B Q3: C Q4: C Q5: A Q6: C OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Function and Condition Summary Sheet for the Oregon Method WetlandCode: OG-3 ProjectNumber: 7965096 Function Evaluation Descriptor : Rationale Wildlife Habitat The wetland provides Two or more Cowardin wetiand classes. diverse wildlife habitat. Emergent veg. & ponding or open water only. Low degree of Cowardin class interspersion. Between 0.5 and 1 acre of unvegetated open water present: Wetland connected to another body of water by surface water. Wetland connected to other wetlands within a 3 mile radius. Upstream not {isted as water quality limited. Exclusive Forest use or Open Space within 500 feet of wetland edge. More #han 40% of wetland edge bordered by veg. buffer 25 or more feet wide. Fish Habitat - Streams The wetland's fish habitat More than 75% of stream shaded by riparian function is impacted or yegetation. Stream channel natural/returning degraded. to natural physical character. Stream contains fess than 10% of instream structures. Upstream not listed as water quality limited. Exclusive Forest use or Open Space within 500 ft of wetland edge. No fish species present during the year. Fish Habitat - Lakes/Ponds The wetland's fish habitat More than 75°l0 of stream shaded by riparian function is impacted or vegetation. Portions of stream channel degraded. modified. Stream contains less than 10% of instream structures. Upstream not listed as water quality limited. Exclusive Forest use or Open Space within 500 ft of wetland edge. No fish species present during the year. Water Quality The wetland's water quality Surface flow (including streams and ditches) function is intact. is wetland's primary source of water. Evidence of flooding or ponding during part of the growing season. High (>60%j degree of wetland vegetation cover. More than 5 acres of wetland area. Exclusive Forest use or Open Space within 500 feet of wetland edge. Upstream not listed as water quality limited in watershed or adjacent to the wetland. Hydrologic Control The wetland's hydrologic No part of wetland located within 100-year control function is impacted floodplain or enclosed basin. Evidence of or degraded. flooding or ponding during the growing season. Area is more than 5 acres. Waterflow out of wetland is unrestricted. Emergent veg. and ponding , or open water only is dominant cover type. Exclusive Forest Use or Open Space within 500 ft of wetland on downstream or down-slope edge of wetland. Forested or natural area land use upstresm. Sensitivity to lmpact The wetland is potentially Stream flow or bank has been modified by sensitive to future impacts human activities within 1 mile above wetland. Water is not being taken out of streams through active diking, drainage, or irrigation districts upstream. Upstream not listed as water quality limited in watershed upstream of OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Function and Condition Summary Sheet for the Oregon Method WetlandCode: OG-3 ProjectNumber: 7965096 Function Evaluation Descriptor Rationale the or adjacent to the wetland. Exclusive Forest use or Open Space within 500 feet of wetland's edge. Dominant Residentiai/Industrial (developed) land use within 500 feet of wetland's edge. Emergent veg. and ponding,or open water only are the dominant cover types. Enhancement Potential N/A Education The wetland has Wetland site is open to the public for direct educational uses. access or observation. There are no visibfe hazards to the public at the wetland site. Results of wildlife habitat and fish habitat assessment criteria prove wetland provides diverse Wildlife Habitat, or Fish Habitat function is intact. There is existing physical public access to other features or it can be created easily and other habitats can be observed from this site. There is an unmaintained access point within 250 feet of the wetland's edge. Access is not available for limited mobility. Recreation The wetland provides There is a maintained public access point recreational opportunities. within 250 feet of wetland's edge. Wetland not accessible by boat-no boat launch within 1 mile/ cannot develop. No existing trails and viewing areas to guide user or if created, would disrupt wildlife or plant habitat. Wetland provides diverse wildlife habitat. Fishing is not allowed at wetland or adjacent water body (or not applicable). Hunting is not allowed at the wetland. Aesthetic Quality The wetfand is considered Two Cowardin classes are visible from to be moderate{y pleasing. primary viewing area(s). Less than 25% of wetland is visible from viewing area(s). General appearance of wetland has no visual detractors. Visual character with surrounding area is landscaped or manipulated by people. Natural, pleasant odors are present at primary viewing location. Some traffic and other similar sounds and natural sounds are audible at primary viewing locations. Silverton � Wetlands of Special Interest for Protection Assessment Answer Sheet WetlandCode: OG-3 This is potentially a Wetland of Special Interest for Protection. Question 1 B List: Question 2 B List: Question 3 B List: Question 4 B List: Question 5 B Question 6 B Question 7 A List: Oregon Gardens Question 8 B Question 9 B Question 10 B Shapiro and Associates, Inc., 1650 N.W. Naito Parkway, Suite 302, Portland, Oregon 97209 Project Number: 7965096 Silverton Local Wetland Significance Assessment WetiandCode: OG-3 A. "OUT" Test No Wetlands a�tificially CREATED ENTIRELY FROM UPLAND that are: (a) created for the purpose of controlling, storing, or maintaining stormwater; (b) active surface mining ponds; (c) ditches without free and open connection to waters of the state AND without fish; (d) <1 acre and unintentionally created from irrigation leak or construction activity; (e) of any size and created for the purpose of wastewater treatment, stock watering, settling of sediment, cooling industrial water, or as a golf course hazard. No Documented as being contaminated by hazardous substances, materials or wastes ("Hazmat sites"). This wetland MEETS the criteria far identification as a Locaf Significant Wetland B. ••�N Yes Wetlands that score the highest rank for ANY of the four ecological functions addressed by OFWAM or equivalent methodology: Yes wildlife habitat, No fish habitat, Yes water quality, No hydrologic control. No Wetlands that (1) are rated in either the highest or second highest category for water quality (in OFWAM or equivalent) AND that (2) the wetland is within one-quarter mile from a water quality- limited stream as fisted by DEQ. No Contains one or more rare wetland plant communities including those listed in the Oregon Natural Heritage Program's CLASSIFICATIDN AND CATALOG OF NATIVE WETLAND PLANT COMMUNITIES IN OREGON as G1-G3 and S1-S3. No Inhabited by any species listed by the federal or state government as a sensitive, threatened or endangered species in Oregon (unless consultation with appropriate agency deems the site not important for the maintenance of the species. No Wetland rates in either the highest or second highest category for Fish Habitat in OFWAM and is located adjacent to a stream segment that is mapped by ODFW as habitat for "Indigenous anadromous salmonids." No OPTIONAL CRITERION (at discretion of local government): Wetland represents a LOCALLY unique plant community. No OPTIONAL CRITERION (at discretion of local government): Wetland is publicly owned, rates highest rank for education potential, and there is documented use for educational purposes by a school or organization. Shapiro and Associates, Inc., 1650 N.W. Naito Parkway, Suite 302, Portland, Oregon 97215 Project Number: 7965096 SILVERTON LOCAL WETLANDS INVENTORY - Wetland Summary Sheet - Date(s) of Field Verification: 07/01/98 Wetland Mapping Code: SC-1 Investigator(s): DC/CM Size (acres): 0.19 Location Legal: T6S, R1 W, S34 400 Other: Northwest of Robert Frost Elem. Sch. Basin: Silver Creek Soiis Mapped Series: Amity silt loam, Silverton silt loam (SuC) Hydrology ' Hydrologic Source: Groundwater and surface flow from seep Wetland Classification(s): POW Dominant Vegetation Trees Shrubs Vines Herbs Populus trichocarpa Salix scouleriana Rubus discolor Festuca arundinacea Salix sitchensis Agrostis stolonifera Holcus lanatus Mimulus guttatus Veronica americana Ranunculus recurvatus Myosotis arvensis Rumex crispus Juncus effusus Comments: Wetland SC-1 is a small pond on the northern edge of the Robert Frost Elementary School grounds. It is surrounded by a narrow band of wetland trees and shrubs. Soil conditions indicate that the pond may have been excavated at some time in the past for use as an irrigation or stock pond. Wetland Classification Codes: PFO = palustrine forested PSS = palustrine scrub-shrub RSB = riverine streambed (intermittent) PEM = palustrine emergent POW = palustrine open water RUB = riverine unconsolidated bottom SHAPIRO Project Number.• 7965096 WETLAND DETERMINATION DATA SHEET -1987 MANUAL ClienUAppiicant: Citv of Silverton Site: Robert Frost School Plot: 14 T 6S R 1W S 34 City: Silverton County: Marion State: OR Plot Location; Topography NW of Robert Frost Elem. Edge of pond in flowing seep. Project #: 7965096.1 Determined by: DC/DG Date: DETERMINATION: IS THIS PLOT 1N A WETLAND?: yes Comments: Possible historic irrigation pond. Pond area appears to be excavated below the seep. Do Normaf Circumstances exist on the site? Yes Are Soils ❑ Vegetation ❑ Hydrology ❑ significantly disturbed? No EGETATION Dominant Plant Species Ind. %Cover: Ind. %Cover: Herb Stratum -% total cover: 0 Shrub/Saplinq Stratum -% total cover: 40 Salix scouleriana FAC 100 Woodv Vine Stratum -% total cover: 10 Tree Stratum -% total cover: 60 Ruba�s discolor FACU 100 Salix sitchensis FACW 80 Populus trichocarpa FAC 20 Percent of Dominant Species that are OBL, FACW, or FAC (excluding FAC-) 3 of 4 = 75 %(50/20 Rule) Vegetafion Criterion Met? Yes SOlLS Mapped Unit Name: Amity silt loam Drainage Class: Somewhat poorlv drained Taxonomy: Fine, silty, mixed, mesic AQriaquil Xeric AQriabolls FIELD SOIL CHARACTERISTICS: Horizon Depth Matrix Color Redox Abundance, Size, Color Texture, Structure, Other 0-5 10 YR 3/1 5-10 7.5 YR 4/3 10-14 10 YR 3/2 7.5 YR 3/2 ❑ Histosol ❑ Prob. Aquic moisture regime � Redox features ❑ Histic epipedon ❑ Reducing conditions ❑ Concretions ❑ Sulfidic odor ❑ Gleyed ❑ Highly organic surface layer Remarks: Soil horizons appear to have been layered due to excavation. - Soil Criterion Met? Silty muck ` silty clay loam - High clay content silty clay loam ^ silty clay loam - high clay content [� Organic streaking ❑ Organic pan ❑ On hydric soils list _ Yes HYDROLOGYI Depth of inundation <1" Depth to water table: >18" Depth to saturation: surface-5" Primary Indicators: � Inundated 0 Saturated in upper 12" ❑ Water marks ❑ Drift lines � ❑ Sediment deposits � Drainage patterns Secondary Indicators (2 or more required): ❑ Oxidized rhizospheres ❑�ocal soil survey data ❑ Water-stained leaves ❑ FAC-Neutral test ❑ Recorded data (aerials, groundwater data) Explain: � Other Expfain: Remarks: Plot located in flowing broad seep approximately 10 ft. wide. 1/2 - 1 inch inundation. Seep flows into pond (2+ ft depth) 15' from seep. Plot 15 feet S of pond. Hydrology Criterion Met? Yes Shapiro and Associates, Inc. 1650 N.W. Naito Parkway, Suite 302 Portland, OR 97209 (503) 274-9000 WETLAND DETERMINATION DATA SHEET -1987 MANUAL Client/Applicant: C'itv of Silverton Site: Robert Frost School Plot: 15 T 6S R 1W S�4 City: Silverton � County: Marion State: OR Plot Location; Topography West of Baptist church and Robert Frost Elem. 25 feet W of pond. Project #: 7965096.1 Determined by: DC/ DG Date: 7/1/98 DETERMINATION: IS THIS PLOT IN A WETLAND?: No Comments: Field becoming overgrown with shrubs Do Normal Circumstances exist on the site? Yes Are Soils ❑ Vegetation ❑ Hydrology ❑ significantly disturbed? No VEGETATION Dominant Plant Species Ind. %Cover: ind. %Cover: Herb Stratum -% total cover: RO Shrub/Saplinq Stratum -% total cover: 1� Festuca arundinacea FAC- 90 Rhamnus purshiana FAC- 100 Galium aparine FACU 10 Woodv Vine Stratum -% total cover: l0 Tree Stratum -% totai cover: 0 Rubus laciniatus FACU 40 Rubus ursinus FACU 30 Rubus discolor FACU 30 Percent of Dominant Species that are OBL, FACW, or FAC (excluding FAC-) 0 of 5 = 0%(50/20 Rule) Vegetation Criterion Met? �o SOILS Mapped Unit Name: Amity silt loam Drainage Class: Somewhat poorly drained Taxonomy: Fine, silty, mixed, mesic A�riaquic Xeric A�riabolls FIELD SOIL CHARACTERISTICS: Horizon Depth Matrix Color Redox Abundance, Size, Color Texture, Structure, Other 0-18 10 YR 3/2 silty loam ❑ Histosol ❑ Prob. Aquic moisture regime ❑ Redox features ❑ Organic streaking ❑ Histic epipedon ❑ Reducing conditions ❑ Concretions • ❑ Organic pan ❑ Sulfidic odor ❑ Gleyed ❑ Highly organic surFace layer ❑ On hydric soils list Soil Criterion Met? No' HI�DROLQGY Depth of inundatian N/A Depth to water table: >18" Depth to saturation: >18" Primary Indicators: Secondary Indicators (2 or more required): ❑ Inundated ❑ Oxidized rhizospheres ❑ Local soil survey data ❑ Saturated in upper 12" ❑ Water-stained leaves ❑ FAC-Neutral test ❑ Water marks ❑ Recorded data (aerials, groundwater data) ❑ Drift lines Explain: ❑ Sediment deposits ❑ Other ❑ Drainage patterns Explain: Hydrology Ci�iterion Met? No Shapiro and Associates, Inc. 1650 N Naito Parkway, Suite 302 Portland, OR 97209 (503) 274-9000 OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Date(s): 7/1 /98 _ Investigator(s): DC/DG Project Name: City of Siiverton WetlandCode: SC-1 ProjectNumber: 7965096 Wildlife H abitat Q1: A Q2: A Q3: C Q4: C Q5: B Q6: B Q7: A Q8: C Q9a: Q9b: A Fish Habitat Streams Q1: Q2: Q3: Q4: Q5: Q6: Q1: B Q2: B Q3: Q4: C QSa: QSb: A Q6: B �ish Habitat Water Hydrologic Lakes/Ponds Quality Control Q1: C Q1: C Q1: B Q2: A Q2: A Q2: A Q3: A Q3: C Q3: C Q4: A Q4: C Q4: B Q5: C Q5: A Q5: B Q6: C Q6: C Q6: A Q7: A Q1: Q2: Q3: Q4: Q5: Q6: A A B B B B Q1: Q2: Q3: Q4: Q5: Q6: B Q1: C Q2: B Q3: B Q4: B Q5: B Q6: C B A A A B Sensitivity to Impact Q1: B Q2: B Q3: C Q4: A Q5: A Q6: A OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Function and Condition Summary Sheet for the Oregon Method WetlandCode: SC-1 ProjectNumber: 7965096 Function Evaluation Descriptor Rationale Wildlife Habitat The wetland provides habitat for some wildlife species. Two or more Cowardin wetland classes. Woody vegetation is dominant vegetation cover. Low degree of Cowardin class interspersion. Less than 0.5 acre of unvegetated open water present. Wetland not connected to another body of water, but water within 1 mile. Wetland not connected to other wetlands, but within 3 mile radius of other wetlands. Upstream not listed as water quality limited. Residential/Industrial land use within 500 feet of we#land edge. More than 40% of wetland edge bordered by veg. buffer 25 or more feet wide. ' Fish Habitat - Streams N/A Fish Habitat - Lakes/Ponds The wetland's fish habitat Less than 50% of stream shaded by riparian function is impacted or vegetation. Stream channel natural/returning degraded. to natural physical character. Stream contains more than 25% of instream structures. Upstream not listed as water quality limited. Residential/Industrial land use within 500 feet of wetland edge. No fish species present during the year. Water Quality The wetland's water quality Groundwater (including seeps and springs) is function is lost or not wetland's primary source of water. Evidence present. of flooding or ponding during part of the growing season. Low (<60%) degree of wetland vegetation cover. Less than 0.5 acre and wetland is not connecfed to other wetland within a 3 mile radius. Residential/Industrial land use within 500 feet of wetland edge. Upstream not listed as water quality limited in watershed or adjacent to the wetland. Hydrologic Control The wetland's hydrologic No part of wetland located within 100-year control function is impacted floodplain or enclosed basin. Evidence of or degraded. flooding or ponding during the growing season. Area is less than 0.5 acre. Minor restrictions slow down waterflow out of the wetland. Emergent veg. and ponding , or open water only is dominant cover type. Residential/Industrial land use within 500 ft of wetland on downstream or down-slope edge of wetland. Urban or Urbanizing land use in watershed upstream from area. Sensitivity to Impact The wetland is potentially Stream flow or bank has not been modified by sensitive to future impacts human activities within 1 mile above wetland. Water is not being taken Dut of streams through active diking, drainage, or irrigation districts upstream. Upstream not listed as wafer quality limited in watershed upstream of the or adjacent to the wetland. ResidentiaUindustrial (developed) �and use within 500 feet of wetland's edge. Dominant OREGON FRESHWATER WETLAND ASSESSM.ENT METHODOLGY Function and Condition Summary Sheet for the Oregon Method WetlandCode: SC-1 ProjectNumber: 7965096 Function Evaluation Descriptor Rationale Residential/Industrial (developed) land use within 500 feet of wetland's edge. Woody vegetation is the dominant cover. Enhancement Potential The wetland has moderate Wetland has lost one or more functions or potential for enhancement. one or more functions is not present in assessment results for wildlife habitat, fish habitat, water quality and hydrologic control. Wetland's primary source of water is groundwater, including springs and seeps. Wetland's area is less than 0.5 acre. More than 40% of wetland's edge is bordered by a vegetative buffer 25 or more feet wide. Wetland is potentially sensitive to future impacts. Education The wetland has Wetland site is open to the public for direct educational uses. access or observation. There are no visible hazards to the public at the wetland site. Provides wildlife habitat for some species, or fish habitat is impacted or degraded. There is no existing physical public access to other features, but observation of other features can be made. There is an unmaintained access point within 250 feet of the wetland's edge. Access is not available for limited mobility. Recreation The wetland has the There is an unmaintained public access point potential to provide within 250 feet of the wetland's edge. Wetland recreational opportunities. not accessible by boat-no boat launch within 1 mile/ cannot develop. Existing undeveloped trails and viewing ares to guide user. Wetland provides habitat for some species. Fishing is not allowed at wetland or adjacent water body (or not applicable). Hunting is not allowed at the wetland. Aesthetic Quality The wetland is considered One Cowardin class is visible from primary to be moderately pleasing. viewing area(s). Between 25 and 50% of wetland is visible from viewing area(s). General appearance of wetland has no visual detractors. Visual character with surrounding area is open or naturally landscaped. Natural, pleasant odors are present at primary viewing location. Continuous tr�ffic and other intrusive noise and natural sounds are audible at primary viewing location. Silverton Wetlands of Special Interest for Protection Assessment Answer Sheet WetlandCode: SC-1 Question 1 B List: Question 2 B List: Question 3 B List: Question 4 B List: Question 5 B Question 6 B Question 7 B List: Question 8 B Question 9 B Question 10 B Shapiro and Associates, Inc., 1650 N.W. Naito Parkway, Suite 302, Portland, Oregon 97209 Project Number: 7965096 Silverton Locai Wetland Significance Assessment WetlandCode: SC-1 A. "OUT" Test No Wetlands artificially CREATED ENTIRELY FROM UPLAND that are: (a) created for the purpose of controlling, storing, or maintaining stormwater, {b) active surface mining ponds; (c) ditches without free and open connection to waters of the state AND without fish; (d} <1 acre and unintentionalfy created from irrigation leak or constructian activity; (e) of any size and creafed for the purpose of wastewater treatment, stock watering, setEling of sediment, cooling industrial water, or as a golf course hazard. No Documented as being contaminated by hazardous substances, materials or wastes ("Hazmat sites"). T his wetland does NOT meet t he criteria for identification as a Local Signif Wetland B. .,�N.� No Wetlands that score the highest rank for ANY of the four ecological functions addressed by OFWAM or equivalent methodology_ No wildlife habitat, No fish habitat, No water quality, No hydrologic control. No Wetlands that (1) are rated in either the highest or second highest category for water quality (in OFWAM or equivalent) AND that (2) the wetland is within one-quarter mile from a water quaiity- limited stream as listed by DEQ. No Contains one or more rare wetland pEant communities including those listed in the Oregon Natural Heritage Program's CLASSIFICATION AND CATALOG OF NATIVE WETLAND PLANT COMMUNETIES IN OREGON as G1-G3 and S1-S3. No Inhabited by any species listed by the federal or state government as a sensitive, threatened or endangered species in Oregon (unless consultation with appropriate agency deems the site not important for the maintenance of the species. No Wetland rates in either the highest or second highest category for Fish Habitat in OFWAM and is located adjacent to a stream segment that is mapped by ODFW as habitat for "Indigenous anadromous salmonids." No OPTIONAL CRITERION (at discretion of local government): Wetland represents a LOCALLY unique plant community. No OPTIONAL CRITERION (at discretion of local government): Wetland is publicly owned, rates highest rank for education potential, and there is documented use for educational purposes by a school or organization. Shapiro and Associates, Inc., 1650 N.W. Naito Parkway, Suite 302, Portland, Oregon 97215 Project Number: 7965096 SILVERTON LOGAL WETLANDS INVENTORY - Wetland Summary Sheet - Date(s) of Field Ver�fication: Wetland Mapping Code: SC-2 Investigator(s): DC/ JG Size (acres): 0.94 Location Legat: T6S, R1 W, S35 Other: Shelokum Drive Basin: Silver Creek 400 Soiis _ Mapped Series: Nekia silty clay loam (NeB) Hydrology Hydrologic Source: Surface water from seep, groundwafer Wetland Classification(s): POW Dominant Vegetation ' Trees Shrubs Vines Herbs Comments: OFFSITE DETERMINATION. Wetland SC-2 is a constructed, open-water wetland in a developing residential area. The banks of the pond are fairly steep, with what appears to be poor quality soil. A very narrow (approximately 1 to 3 feet) band of vegetation is on the pond margin. A few large trees (Douglas-fir (Pseudotsuga menziesii) and Oregon white oak (Quercus garryana)) remain near the pond, with three or four close enough to shade perhaps 15% of the surface at various times of the day. Herbaceous vegetation near the pond is primarily weedy species colonizing a disturbed site. Water for the pond comes from a seep at the eastern end. The outlet for the pond is a drain system that conveys water dov�rnslope to the west. The water then flows through street-side ditches and storm drains into Silver Creek. Wetland Classification Codes: PFO = palustrine.forested PSS = pafustrine scrub-shrub RSB = riverine streambed (intermittent) ' PEM = palustrine emergent POW = palustrine open water RUB = riverine unconsolidated bottom SNAP/RO Project Number. 7965Q96 Wildlife Habitat Q1: Q2: Q3: Q4: Q5: Q6: Q7: Q8: Q9a: Q9b: Fish Habitat Fish Habitat Water Hydrologic ' Sensitivity to Streams Lakes/Ponds Quality, Control Impact C Q1: Q1: A Q1: C Q1: A Q1: A B Q2: Q2: C Q2: A Q2: A Q2: B C Q3: Q3: C Q3: C Q3: B Q3: C B Q4: Q4: A Q4: B Q4: A Q4: C B Q5: Q5: A Q5: C Q5: B Q5: A., B Q6: Q6: C Q6: C Q6: C Q6: C A Q7: � C A A Q1: B Q2: B Q3: Q4: B Q5a: Q5b: B Q6: B Q1: Q2: Q3: Q4: Q5: Q6: A A B A A B Q1: Q2: Q3: Q4: Q5: Q6: '�ua'�i�� A Q1: C Q2: C Q3: B Q4: B Q5: B Q6: OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Function and Condition Summary Sheet for the Oregon Method WetlandCode: SC-2 Pro"ectNumber: 7965096 Function Evaluation Descriptor Rationale Wildlife Habitat The wetland provides habitat for some wildlife species. One Cowardin wetland class with 5 or fewer plant species. Emergent veg. & ponding or open water only. Low degree of Cowardin class interspersion. Between 0.5 and 1 acre af unvegetated open water present. Wetland not connected to another body of water, but water within 1 mile. Wetland not connected to other wetlands, but within .3 mile radius of other wetlands. Upstream not listed as water quality limited. Exclusive Forest use or Open Space within 500 feet of wetland edge. More than 40% of wetland edge bordered by veg. buffer 25 or more feet wide. Fish Habitat - Streams N/A Fish Habitat - Lakes/Ponds The wetland's fish habitat More than 75% of stream shaded by riparian function is impacted or vegetation. Physical character of stream degraded. channel extensively modi�ed/piped. Stream contains less than 10% of instream structures. Upstream not listed as water quality limited. Exclusive Forest use or Open Space within 500 ft of wetland edge. No fish species present during the year. Water Quality The wetland's water quality Groundwater (including seeps and springs) is function is lost or not wetland's primary source of water. Evidence present. of flooding or ponding during part of the growing season. Low (<60%) degree of wetland vegetation cover. Between 0.5 and 5 acres of wetland connected to other wetlands within a 3 mile radius. Exclusive Forest use or Open Space within 500 feet of wetland edge. Upstream not listed as water quality limited in watershed or adjacerit to the wetland. Hydrologic Control The wetland's hydrologic All or part of wetland located within 100-year control function is impacted floodplain or enclosed basin. Evidence of or degraded. flooding or ponding during the growing season. Area is between 0.5 and 5 acres. Waterflow out of wetland is restricted or no outlet. Emergent veg. and ponding , or open water only is dominant cover type. Exclusive Forest Use or Open Space within 500 ft of wetland on downstream or down-slope edge of wetland. Forested or natural area land use upstream. Sensitivity to lmpact The wetland is potentially Stream flow or bank has been modified by sensitive to future impacts human activities within 1 mile above wetland. Water is not being taken out of streams through active diking, drainage, or irrigation districts upstream. Upstream not listed as water quality limited in watershed upstream of the or adjacent to the wetland. Exclusive Forest use or Open Space within 500 feet of wetland's edge. Dominant OREGON FRESHWATER WETLAND ASSESSMENT METHODOLGY Function and Condition Summary Sheet for the Oregon Method WetlandCode: SG2 ProjectNumber: 7965096 Function Evaluation Descriptor Rationale Residentiai/Industrial (developed) land use within 500 feet of wetland's edge. Emergent veg. and ponding,or open water only are the dominant cover types. Enhancement Potential The wetland has moderate Wetland has lost one or more functions or potential for enhancement. one or more functions is not present in assessment results for wildlife habitat, fish habitat, water quality and hydrologic control. Wetland's primary source of water is groundwater, including springs and seeps. Wetland's area is between 0.5 and 5 acres. Between 10 and 40 % of wetland's edge is bordered by a vegetative buffer 25 or more feet wide. Wetland is potentially sensitive to future impacts. Education The wetland has Wetland site is open to the public for direct educational uses. access or observation. There are no visible hazards to the public at the wetland site. Provides wildlife habitat for some species, or fish habitat is impacted or degraded. There is existing physical public access to other features or it can be created easily and other habitats can be observed from this site. There is a maintained public access point within 250 feet of the wetland's edge. Access is not available for limited mobility. Recreation The wetland has the There is a maintained public access point potential to provide . within 250 feet of wetland's edge. Wetland not recreational opportunities. accessible by boat-no boat launch within 1 mile/ cannot develop. No existing trails and viewing areas to guide user or if created, would disrupt wildlife or plant habitat. Wetland provides habitat for some species. Fishing is not allowed at wetland or adjacent water body (or not applicable). Hunting is not allowed at the wetland. Aesthetic Quality The wetland is considered One Cowardin class is visible from primary to be moderately pleasing. viewing area(s). More than 50% of wetland is visible from viewing area(s). General appearance of wetland has no visual detractors. Visual character with surrounding area is landscaped or manipulated by people. Natural, pleasant odors are present at primary viewing location. Some traffic and other similar sounds and natural sounds are audible at primary viewing locations. Silverton Wetlands of Speciai Interest for Protection Assessment Answ Sheet WetlandCode: SC-2 Question 1 B List: Question 2 B List: Question 3 B List: Question 4 B List: Question 5 B Question 6 B Question 7 B List: Question 8 B Question 9 B • Question 10 B. Shapiro and Associates, Inc., 1650 N.W. Naito Parkway, Suite 302, Portland, Oregon 97209 Project Number: 7965096 Silverton Local Wetland Signi�cance Assessment WetlandCode: SC-2 A. "OUT" Test No Wetlands artificially CREATED ENTIRELY FROM UPLAND that are: (a) created for the purpose of controlling, storing, or maintaining stormwater; (b) active surface mining ponds; (c) ditches without free and open connection to waters of the state AND without fish; (d) <1 acre and unintentionally created from irrigation leak or construction activity; (e) of any size and created for the purpose of wastewater treatment, stock watering, settling of sediment, cooling industrial water, or as a golf course hazard. No Documented as being contaminated by hazardous substances, materials or wastes ("Hazmat sites"). This wetland does NOT meet the criteria for identification as a Local Significant Wetland B. "IN" No Wetlands that score the highest rank for ANY of the four ecological functions addressed by OFWAM or equivalent methodology: No wildlife habitat, No fish habitat, No water quality No hydrologic control. No Wetlands that (1) are rated in either the highest or second highest category for water quality (in OFWAM or equivalent) AND that (2} the wetland is within one-quarter mile from a water quality- limited stream as listed by DEQ. No Contains one or more rare wetland plant commu�ities including those listed in the Oregon Natu�al Heritage Program's CLASSIFICATION AND CATALOG OF NATIVE WETLAND PLANT COMMUNITIES IN OREGON as G1-G3 and S1-S3. No Inhabited by any species listed by the federal or state government as a sensitive, threatened or endangered species in Oregon (unless consultation with appropriate agency deems the site not important for the maintenance of the species. No Wetland rates in either the highest or second highest category for Fish Habitat in OFWAM and is located adjacent to a stream segment that is mapped by ODFW as habitat for "Indigenous anadromous salmonids." No OPTIONAL CRITERION (at discretion of local government): Wetland represents a LOCALLY unique plant community. No OPTIONAL CRITER{ON (at discretion of local government): Wetland is publicly owned, rates highest rank for education potential, and there is documented use for educational purposes by a school or organization. Shapiro and Associates, Inc., 1650 N.W. Naito Parkway, Suite 302, Portfand, Oregon 97215 Project Number: 7965096 f