Statewide Wetlands Inventory (SWI)

The SWI map viewer provides state-recognized Disclaimer wetlands and waters mapping in one location. It includes both wetlands and waters mapping Information shown on this map is for planning because both may be regulated by DSL. purposes, represents the conditions that exist at the map date, and is subject to change. The location Local Governments – The SWI is used to check if a and extent of wetlands and other waters is project area is near or within mapped wetlands or approximate. There may be unmapped wetlands waters. If it is, and the project includes ground- and other waters present that are subject to disturbing activities, send a wetland land use notice regulation. A current Oregon Department of State (WLUN) to DSL. The DSL response describes next Lands-approved wetland delineation is required for state removal-fill permits. You are advised to steps that may be needed to proceed with the contact the Department of State Lands and the U.S. project, if any. Army Corps of Engineers with any regulatory If you are a planner using the SWI to screen for questions. WLUN requirements use all the map layers The Statewide Wetlands Inventory (SWI) represents together. If any SWI mapping appears in the project the best data available at the time the data was area, submit a WLUN to DSL. DSL will respond published and is updated as new data becomes within 30 days. More information about wetland available. In all cases, actual field conditions land use notices and the online submittal form for determine the presence, absence and boundaries of local governments: wetlands and waters (such as creeks and ponds). An http://www.oregon.gov/dsl/WW/Pages/WetlandConserv onsite investigation by a wetland professional can ation.aspx verify actual field conditions. This product is for informational purposes, and may Landowners, prospective landowners, realtors – not be suitable for legal, engineering, or surveying Would you like more information about aquatic purposes. This information or data is provided with resources before you buy property or begin a the understanding that conclusions drawn from project in or near an SWI mapped area? DSL offers a such information are the responsibility of the user. free service to help you determine the potential Some SWI data layers are created and maintained need for DSL permitting. Submit an offsite wetland by organizations and entities outside of the determination request form: Department of State Lands. Brief descriptions and http://www.oregon.gov/dsl/WW/Documents/wetland_d limitations are provided. Refer to the original source eterm_req.pdf documentation to better understand the data DSL will respond in approximately 30 days. sources, results, methodologies and limitations of Department approved wetland delineation mapping each dataset presented. DSL makes no claims, is part of the SWI, but it is not available in GIS representations or warranties as to the accuracy or format at this time. Local planning offices and DSL completeness of these external data layers. have paper and pdf copies that may be requested from DSL by making a public records request: http://www.oregon.gov/DSL/Pages/PRR.aspx

Page | 1 Layer Descriptions and Limitations Local Wetlands Inventories (LWI) – Coming in These descriptions are provided for general 2018! information. See the original source documentation In the meantime, view and download Local Wetland for full dataset details. Inventory maps and reports: http://www.oregon.gov/dsl/WW/Pages/Inventories.aspx USFWS National Wetlands Inventory (NWI) Download available GIS datasets: https://chetco-new.dsl.state.or.us/data “The National Wetlands Inventory (NWI) was established by the US Fish and Wildlife Service In addition to mapping wetlands and waters within [USFWS] in 1974 to conduct a nationwide inventory a specific study area, LWIs include a report of U.S. wetlands to provide its biologists and others describing the study methods, study area, detailed with information on the distribution of wetlands to information about each wetland identified and a aid in wetland conservation efforts.” functional assessment of each wetland greater than NWI mapping was originally based on wetlands and 0.5 acre in size. The functional assessment scores other waters that were visible on high-altitude each wetland’s capacity to provide or perform aerial photography. The scope of this national effort functions such as increased water quality, water limited the amount of field verification possible. storage and delay, and fish and wildlife habitats. Most of the Oregon mapping dates to the mid- These findings are used to determine if a wetland is 1980s. The coastal zone was updated in the late a “locally significant wetland” (LSW). 2000’s when the NWI was digitized. NWI mapping is The more accurate LWI wetland and waters available for the entire state. mapping replaces the NWI mapping within the There are limitations with the Oregon NWI, study area of the LWI. LWI mapping is for planning including: purposes. DSL approved wetland delineation • There are unmapped wetlands and waters, mapping is required for state removal-fill permits. including many smaller, seasonal and Characteristics of LWI mapping include: forested wetlands that may not have been • Wetland boundaries are mapped onsite detected from the aerials. where access permission is granted. Where • By policy, the NWI excludes certain types of access is not permitted, resource "farmed wetlands" as may be defined by boundaries are estimated using offsite the Food Security Act. Although many methods. There may be wetlands and farmed areas in Oregon meet wetland waters that are unmapped. criteria, many of these important wetlands • Recent LWIs have a boundary accuracy of are unmapped. approximately 5 meters (16.4 feet). Prior to • The wetland and waters boundaries are 2009 the goal accuracy was +/- 25 feet. approximate. Conducting on-the-ground • Most LWI field work includes some level of wetland delineations is the only way to ground-verification of stream locations. verify wetland boundary locations. • Wetlands that are estimated to be smaller The NWI mapping presented in this SWI map viewer than 0.5 acre are represented as “probable is updated semiannually from the USFWS NWI wetlands” (PW). Wetlands Mapper so it always represents the most current NWI mapping. For more information go to the NWI home page: https://www.fws.gov/wetlands/nwi/index.html

Page | 2 06/2018 USDA NRCS Soils Agate-Winlo soil, Jackson County The US Department of Agriculture’s Natural Agate-Winlo soil occurs in Jackson County near Resources Conservation Service (NRCS) develops Medford and is highly associated with a type of soil surveys that include maps of soils and related wetland of conservation concern called vernal reports. Extensive field work is done to complete pools. This soil does not contain predominantly the mapping and document findings. The maps hydric map units so does not appear in that layer. consist of outlined areas called map units. These are As with the other map layers in the SWI, there may areas with generally similar soils, or a mix of soil be areas of predominately hydric soil map units and types that can be consistently identified across the Agate-Winlo soil that do not contain wetlands, and landscape. When more than one named soil occurs wetlands will occur in soil map units with less than in a map unit, each soil is called a component of the 50% hydric components. The presence of map unit. Each component makes up a certain predominantly hydric soil map units or Agate-Winlo percentage of the map unit. Two subsets of the soils soil helps planners, landowners, and others dataset are helpful in predicting the presence of recognize where further site assessment is needed. wetlands and are included in the SWI. More information on the NRCS soil survey: https://websoilsurvey.nrcs.usda.gov/app/HomePage.htm Predominantly hydric soil map units Some soils naturally retain water longer than others, especially when they occur on certain parts of the landscape, such as depressions. These soils often exhibit characteristics (e.g. routinely flooded) that meet the definition of, and they are designated as “hydric soils.” (NRCS Hydric Soils List Criteria https://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/ use/hydric/?cid=nrcs142p2_053959) Because of these characteristics hydric soils are often found on the landscape where wetlands occur. The SWI shows soil map units that are comprised of predominately (greater than 50%) hydric soil components. This means that a user can expect more than half of that soil map unit to include soil USGS National Hydrography Dataset (NHD) components that have been designated as hydric. “The US Geological Survey’s NHD represents the These map units indicate places across the nation’s drainage networks and related features, landscape with a higher likelihood for wetlands to including rivers, streams, canals, lakes, ponds, occur. Displaying predominantly hydric soil map glaciers, coastlines, dams and stream gages. The units in the SWI is especially helpful in recognizing NHD High Resolution, at 1:24,000 scale or better, is potential wetland areas in places where only the the most up-to-date and detailed hydrography NWI mapping is available. dataset for the nation.” The NHD is developed through complex modeling using multiple types of information, including some local level input. The mapped resource boundaries may differ from their actual location on the ground. Onsite investigations may be needed to confirm wetlands and waters boundaries. https://nhd.usgs.gov/

Page | 3 06/2018 Essential Salmonid Habitat (ESH) and SWI mapping that may be added to the web map State Scenic Waterways (SSW) in the future: The mapping of ESH and SSW has not been added DSL-Approved Wetland Delineation Mapping – This to the SWI . However, being aware of their locations is the most accurate wetland mapping and can be helpful for project planning. HWithin a ES d n supersedes other mapping types within a study SSW any removal and fill activities Lrequire a DS area, but it is not available in GIS format. permit. Activities customarily associated with Compensatory wetland mitigation (CWM) sites – all agriculture in ESH have a 50 cubic yards permit removal and fill in CWM sites requires a DSL permit threshold. Projects in SSW may require additional and double mitigation. coordination through the Oregon Parksd an Recreation Department. Maps are available on et h DSL website: More information:

Essential Salmonid Habitat (ESH) Jevra Brown Aquatic Resource Planner https://chetco-new.dsl.state.or.us/esh2017/ Department of State Lands 775 Summer St. NE, Suite 100 State Scenic Waterways (SSW) Salem, Oregon, 97301 http://www.oregon.gov/dsl/WW/Pages/SSW.aspx [email protected] Office (M-W): 503-986-5297 Cell (Th-F): 503-580-3172 Fax: 503-378-4844

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