This web map contains datasets representing the National Hydrography Dataset (NHD) of Washington State, labels for NHD features, and the Watershed Boundary Dataset (WBD) basins for Hydrologic Unit Code (HUC) levels 4, 8, and 12. The NHD dataset has been adopted as the Washington State hydrography standard. The NHD is a national framework for assigning reach addresses to water-related entities, such as industrial discharges, drinking water supplies, fish habitat areas, wild and scenic rivers. Reach addresses establish the locations of these entities relative to one another within the NHD surface water drainage network, much like addresses on streets. Once linked to the NHD by their reach addresses, the upstream/downstream relationships of these water-related entities--and any associated information about them--can be analyzed using software tools ranging from spreadsheets to geographic information systems (GIS). GIS can also be used to combine NHD-based network analysis with other data layers, such as soils, land use and population, to help understand and display their respective effects upon one another. Furthermore, because the NHD provides a nationally consistent framework for addressing and analysis, water-related information linked to reach addresses by one organization (national, state, local) can be shared with other organizations and easily integrated into many different types of applications to the benefit of all.This high-resolution NHD, generally developed at 1:24,000/1:4,800 scale. Local resolution NHD is being developed where partners and data exist. The NHD contains reach codes for networked features, flow direction, names, and centerline representations for areal water bodies. The NHD also incorporates the National Spatial Data Infrastructure framework criteria established by the Federal Geographic Data Committee.This map contains a BETA version of WaterType attached to the Skagit River Basin NHDflowlines. This Beta version of the Watertype is the result of a pilot project and will be refined over the next six months. The field is for users of NHD who want access to Water Type and who are not under Forest Practices rules. The WaterType uses Shorelines Master Program type S streams and Fish Presence Data from both WA Dept Natural Resources and WA Dept Fish and Wildlife.

Regional map showing Lake Sammamish and Tributaries. Hydrography source data is from USGS (https://nhd.usgs.gov/).Feature layer generated from running the Find Existing Locations solutions for Washington State NHD Hydrography-NHD Rivers.Expression Washington State NHD Hydrography-NHD Rivers where GNIS_Name is 'Issaquah Creek' or Washington State NHD Hydrography-NHD Rivers where GNIS_Name is 'East Fork Issaquah Creek' or Washington State NHD Hydrography-NHD Rivers where GNIS_Name is 'Tibbetts Creek' or Washington State NHD Hydrography-NHD Rivers where Permanent_Identifier is '148889234' or Washington State NHD Hydrography-NHD Rivers where ReachCode is '17110012000339' or Washington State NHD Hydrography-NHD Rivers where ReachCode is '17110012001631' or Washington State NHD Hydrography-NHD Rivers where ReachCode is '17110012001600' or Washington State NHD Hydrography-NHD Rivers where ReachCode is '17110012004740' or Washington State NHD Hydrography-NHD Rivers where ReachCode is '17110012001568' or Washington State NHD Hydrography-NHD Rivers where ReachCode is '17110012001563' or Washington State NHD Hydrography-NHD Rivers where GNIS_Name is 'George Davis Creek' or Washington State NHD Hydrography-NHD Rivers where GNIS_Name is 'Ebright Creek' or Washington State NHD Hydrography-NHD Rivers where GNIS_Name is 'Pine Lake Creek' or Washington State NHD Hydrography-NHD Rivers where GNIS_Name is 'Zackuse Creek' or Washington State NHD Hydrography-NHD Rivers where Permanent_Identifier is '148888780' or Washington State NHD Hydrography-NHD Rivers where Permanent_Identifier is '148888783' or Washington State NHD Hydrography-NHD Rivers where Permanent_Identifier is '148888784' or Washington State NHD Hydrography-NHD Rivers where GNIS_Name is 'Lewis Creek' or Washington State NHD Hydrography-NHD Rivers where GNIS_Name is 'Squibbs Creek'

The WA State National Hydrography Dataset (NHD) is the standard hydrography for Washington. NHD Lines represent linear NHD hydrographic landmark features used for cartographic representation. Some of these are: Bridge, Dam, Flume, Gate, Levee, Sounding Datum Line. NHD Lines should not be confused with NHD Flowlines which are the major blue line data. NHD Line data for Washington are developed at a resolution of 1:4,800 to 1:24,000. This dataset was extracted from and projected into WA State Plane Coordinates South. The National Hydrography Dataset (NHD) is a feature-based database that as a whole interconnects and uniquely identifies the stream segments or reaches that make up the nation's surface water drainage system. This high-resolution NHD, generally is developed at 1:24,000/1:12,000 scale, but many areas of Washington State have been improved to 1:4800 scale. NHD data was originally developed at 1:100,000-scale and exists at that scale for the whole country. Local resolution NHD is being developed where partners and data exist. The NHD contains reach codes for networked features, flow direction, names, and centerline representations for areal water bodies. Reaches are also defined on waterbodies and the approximate shorelines of the Great Lakes, the Atlantic and Pacific Oceans and the Gulf of Mexico. The NHD also incorporates the National Spatial Data Infrastructure framework criteria established by the Federal Geographic Data Committee. A detailed data dictionary is available at https://nhd.usgs.gov/userguide.html?url=NHD_User_Guide/Feature_Catalog/NHD_Feature_Catalog.htm

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The WA State National Hydrography Dataset (NHD) is the standard hydrography for Washington. NHD Flowline contains linear watercourses representing streams, rivers, canals, ditches, coastline, pipelines, and artificial paths (centerlines through water polygon features such as lakes, estuaries, or double-banked streams). Flowline data for Washington are developed at a resolution of 1:4,800 to 1:24,000. This dataset was extracted and projected into WA State Plane Coordinates South. The coastline in the Puget Sound was updated in 2022 and references the Mean High Water (MHW) datum. Strahler Stream Order has been calculated and added using Esri ArcGIS Pro tools. A trace network was created from simplified flowlines and has also been added. The National Hydrography Dataset (NHD) is a feature-based database that interconnects and uniquely identifies the stream segments or reaches that make up the nation's surface water drainage system. This high-resolution NHD, generally is developed at 1:24,000/1:12,000 scale, but many areas of Washington State have been improved to 1:4800 scale. NHD data was originally developed at 1:100,000-scale and exists at that scale for the whole country. Local resolution NHD is being developed where partners and data exist. The NHD contains reach codes for networked features, flow direction, names, and centerline representations for areal water bodies. Reaches are also defined on waterbodies and the approximate shorelines of the Great Lakes, the Atlantic and Pacific Oceans and the Gulf of Mexico. The NHD also incorporates the National Spatial Data Infrastructure framework criteria established by the Federal Geographic Data Committee. Stream Orders in Washington State range from 1 to 10. The smallest headwater streams are a 1, and the Columbia River is a 10. A detailed data dictionary is available at https://nhd.usgs.gov/userguide.html?url=NHD_User_Guide/Feature_Catalog/NHD_Feature_Catalog.htm

NHDPointEventFC which contains points that are tied to a specific location on a stream network by a reachcode and measure and include Stream Gages, Dams, and NWIS Water Quality monitoring locations.NHDPointEventFC should not be confused with NHDPoint which contains points representing NHD hydrographic landmark features. Some of these are: Rapids, Waterfall, SpringSeep, Rock. Gate, Well.The National Hydrography Dataset (NHD) is a feature-based database that interconnects and uniquely identifies the stream segments or reaches that make up the nation's surface water drainage system. NHD data was originally developed at 1:100,000-scale and exists at that scale for the whole country. This high-resolution NHD, generally developed at 1:24,000/1:12,000 scale, adds detail to the original 1:100,000-scale NHD. (Data for Alaska, Puerto Rico and the Virgin Islands was developed at high-resolution, not 1:100,000 scale.) Local resolution NHD is being developed where partners and data exist. The NHD contains reach codes for networked features, flow direction, names, and centerline representations for areal water bodies. Reaches are also defined on waterbodies and the approximate shorelines of the Great Lakes, the Atlantic and Pacific Oceans and the Gulf of Mexico. The NHD also incorporates the National Spatial Data Infrastructure framework criteria established by the Federal Geographic Data Committee.A complete Data Catalog is available at: https://nhd.usgs.gov/userguide.html?url=NHD_User_Guide/Feature_Catalog/NHD_Feature_Catalog.htm

Spatial representation of surface water points of diversion locations as interpreted from water-right documents, including (but not limited to) water-right certificates, water-right permits, water-right applications, and water-right claims.http://www.ecy.wa.gov/programs/wr/rights/water-right-home.html

DATA LINKED FROM WDFW Rest ServicesSee the original layer hereSWIFD is the Statewide Washington Integrated Fish Distribution, presented as a linear featureclass based on WA single stream identifiers (LLID). The Statewide Washington Integrated Fish Distribution (SWIFD) dataset is a single National Hydrography Dataset (NHD) event layer for the state of Washington. Within the Treaty Tribes and Washington State co-management area, the Northwest Indian Fisheries (NWIFC) and Washington State Department of Fish and Wildlife (WDFW) collaborated to create a single data schema and to combine fish distribution data. The NWIFC and WDFW combined data area is within the boundaries of Washington State Water Resource Inventory Areas (WRIA) 01 -- 23. This is the western Washington region including the western Washington Cascades, the Puget Sound, the Hood Canal, the Strait of Juan de Fuca, and the Olympic peninsula from the Nooksack River in the north (WRIA 01) to the Chehallis River (WRIA 22/23) in the South. The data schema remains the same for Washington state fish distribution data outside of the co-management area, but all fish distribution data outside of the co-management area is supplied by WDFW. The foundational fish distribution dataset is an event table that contains attributes for each species of fish, anadromous and resident, that have previously been mapped by either NWIFC or WDFW. This event layer maps to the ROUTED 1:24,000-scale version of NHD for Washington state, using NHD ReachCodes as the route identifier, and relative 0-100 linear measures within each reach/route. SWIFD events are in the USGS Hydrologic Event Management (HEM, http://nhd.usgs.gov/tools.html#hem) table format and HEM is used to update and maintain the event tables. Each individual fsh species/run contains information on verification of the upper extent of fish distribution, life history, and habitat use. In the final dataset all the individual fish species/run distributions are stacked onto the NHD reaches, so a given stream reach with 6 unique species/runs will have 6 features associated with it. Usually a definition query is applied to this featureclass to display a single species at a time. The event table structure of the dataset does allow groups of species/runs to be integrated via the use of event overlays. Users should also pay attention to the DISTTYPE_DESC field to ensure they are displaying the appropriate records for their purposes. In particular, there are confirmed absence records for certain species that should not be displayed as occupied stream habitat. SWIFD is developed by dissolving the foundational NHD ReachCode event table SWIFD_2HEM_evts by the LLID and the specific fish record attributes: LLID;LLID_STRM_NAME;SPECRCODE;SPECIESRUN;SPECCODE;SPECIES;RUN_TIME;RUNTIME_DESC;DIST_TYPE;DISTTYPE_DESC;USE_TYPE;USETYPE_DESC;LIFE_HIST;LIFEHIST_DESC;

The NHD is a national framework for assigning reach addresses to water-related entities, such as industrial discharges, drinking water supplies, fish habitat areas, wild and scenic rivers. Reach addresses establish the locations of these entities relative to one another within the NHD surface water drainage network, much like addresses on streets. Once linked to the NHD by their reach addresses, the upstream/downstream relationships of these water-related entities--and any associated information about them--can be analyzed using software tools ranging from spreadsheets to geographic information systems (GIS). GIS can also be used to combine NHD-based network analysis with other data layers, such as soils, land use and population, to help understand and display their respective effects upon one another. Furthermore, because the NHD provides a nationally consistent framework for addressing and analysis, water-related information linked to reach addresses by one organization (national, state, local) can be shared with other organizations and easily integrated into many different types of applications to the benefit of all.The WA State National Hydrography Dataset (NHD) is the standard hydrography for Washington. NHD Waterbody along with WA NHD Area represent the polygon water features. NHD Flowline contains the linear watercourses. NHDWaterbody types and their corresponding FType Codes are Estuary(493), LakePond(390), SwampMarsh(466), Constructed Reservoir(436), Ice Mass(378), and Playa(361). The WA State National Hydrography Dataset (NHD) is the standard hydrography for Washington. NHD Lines represent linear NHD hydrographic landmark features used for cartographic representation. Some of these are: Bridge, Dam, Flume, Gate, Levee, Sounding Datum Line. NHD Lines should not be confused with NHD Flowlines which are the major blue line data. NHD Line data for Washington are developed at a resolution of 1:4,800 to 1:24,000. This dataset was extracted from and projected into WA State Plane Coordinates South. The National Hydrography Dataset (NHD) is a feature-based database that as a whole interconnects and uniquely identifies the stream segments or reaches that make up the nation's surface water drainage system. This high-resolution NHD, generally is developed at 1:24,000/1:12,000 scale, but many areas of Washington State have been improved to 1:4800 scale. NHD data was originally developed at 1:100,000-scale and exists at that scale for the whole country. Local resolution NHD is being developed where partners and data exist. The NHD contains reach codes for networked features, flow direction, names, and centerline representations for areal water bodies. Reaches are also defined on waterbodies and the approximate shorelines of the Great Lakes, the Atlantic and Pacific Oceans and the Gulf of Mexico. The NHD also incorporates the National Spatial Data Infrastructure framework criteria established by the Federal Geographic Data Committee. A detailed data dictionary is available at https://nhd.usgs.gov/userguide.html?url=NHD_User_Guide/Feature_Catalog/NHD_Feature_Catalog.htm

NHD Hydrologic Network Junctions contains points representing NHD hydrographic network junction point and segment extent features. These features can be used to participate within a geometric network or trace network with the NHDFlowline dataset.

NHD_MajorWaterbodies are a subset of the largest waterbody features selected from the High Resolution NHD dataset for Washington State. This subset includes only waterbodies that are classified as lake/ponds ,reservoirs, or estuaries and that are > 1 sqKm (10763900 sqft).The National Hydrography Dataset (NHD) is a feature-based database that interconnects and uniquely identifies the stream segments or reaches that make up the nation's surface water drainage system. This high-resolution NHD, generally developed at 1:12,000/1:24,000 scale, adds detail to the original 1:100,000-scale NHD Local resolution NHD is being developed where partners and data exist. The NHD contains reach codes for networked features, flow direction, names, and centerline representations for areal water bodies. Reaches are also defined on waterbodies and the approximate shorelines of the Great Lakes, the Atlantic and Pacific Oceans and the Gulf of Mexico. The NHD also incorporates the National Spatial Data Infrastructure framework criteria established by the Federal Geographic Data Committee.

The locations of approximately 23,000 current and historical U.S. Geological Survey (USGS) streamgages in the United States and Puerto Rico (with the exception of Alaska) have been snapped to the medium resolution National Hydrography Dataset (NHD). The NHD contains geospatial information about mapped surface-water features, such as streams, lakes, and reservoirs, etc., creating a hydrologic network that can be used to determine what is upstream or downstream from a point of interest on the NHD network. An automated snapping process made the initial determination of the NHD location of each streamgage. These initial NHD locations were comprehensively reviewed by local USGS personnel to ensure that streamgages were snapped to the correct NHD reaches. About 75 percent of the streamgages snapped to the appropriate NHD reach location initially and 25 percent required adjustment and relocation. This process resulted in approximately 23,000 gages being successfully snapped to the NHD.

 This dataset contains the latitude and longitude coordinates of the point on the NHD to which the streamgage is snapped and the location of the gage house for each streamgage. A process known as indexing may be used to create reference points (event tables) to the NHD reaches, expressed as a reach code and measure (distance along the reach). Indexing is dependent on the version of NHD to which the indexing is referenced. These data are well suited for use in indexing because nearly all the streamgage NHD locations have been reviewed and adjusted if necessary, to ensure they will index to the appropriate NHD reach.

Flow characteristics were computed from the daily streamflow data recorded at each streamgage for the period of record. The flow characteristics associated with each streamgage include:

First date (year, month, day) of streamflow data Last date (year, month, day) of streamflow data Number of days of streamflow data Number of days of non-zero streamflow data Minimum and maximum daily flow for the period of record (cubic feet per second) Percentiles (1, 5, 10, 20, 25, 50, 75, 80, 90, 95, 99) of daily flow for the period of record (cubic feet per second) Average and standard deviation of daily flow for the period of record (cubic feet per second) Mean annual base-flow index (BFI) computed for the period of record (fraction, ranging from 0 to 1) Year-to-year standard deviation of the annual base-flow index computed for the period of record (fraction) Number of years of data used to compute the base-flow index (years)

The streamflow data used to compute flow characteristics were copied from the NWIS-Web historical daily discharge archive (http://waterdata.usgs.gov/nwis/sw) on June 15, 2005.

Washington State's Current (2018) Water Quality Assessment (WQA) is produced in the Environmental Protection Agency's "Integrated Report" format. The WQA consists of both the 303(d) List and the 305(b) Report. The 303(d) List is comprised of only Category 5 listings. The 305(b) Report lists all waters and all categories. The 2018 WQA contains both freshwater and marine listings. EPA approved the 2018 WQA as fulfilling our 2014, 2016, 2018 WQA submittal requirements on August 26, 2022. The WQA is presented on the 1:24k National Hydrography Dataset (NHD).

Applicants for grant funding through Ecology's Water Quality Financial Assistance programs should use the information in this map as the default minimum riparian buffer that will be funded for best management practice (BMP) implementation in a TMDL or other water quality improvement project. The buffer width information presented in this map is based on the 2013 Distribution of Anadromous and ESA listed fish species, and the most recent published flowlines from the National Hydrography Dataset (NHD). Anadromous and ESA listed fish distribution data was compiled by the Northwest Indian Fish Commission (NWIFC) and the Washington Department of Fish and Wildlife (WDFW) and combined with the NHD flowlines so that minimum buffer widths could be associated with the different NHD FCodes and fish presence as outlined in Table L-1 of the 2015 Funding Guidelines (Ecology publication no. 13-10-041).Stream flowlines will only draw on the map at certain scales; if you don't see the blue and green stream lines (drawn over the basemap), then zoom in a little farther so they show up.

Input datasets: Washington State Department of Natural Resources: Transportation 2011 (roads only); Non-DNR Major Public Lands (2014) Washington State Department of Ecology: NHD 2014 (not pipeline, coastline, or Grays Harbor artificial path); HUC-12 Watersheds

Input datasets: Washington State Department of Natural Resources: Transportation 2011 (roads only); Non-DNR Major Public Lands (2014) Washington State Department of Ecology: NHD 2014 (not pipeline, coastline, or Grays Harbor artificial path); HUC-12 Watersheds

NHDPoint contains points representing NHD hydrographic landmark features. Some points may have reach codes. Some of these are: Rapids, Waterfall, SpringSeep, Rock. Gate, Well. NHDPoint should not be confused with NHDPointEventFC which contains points that are tied to a specific location on a stream network by a reachcode and measure and include Stream Gages, Dams, and NWIS Water Quality monitoring locations. The WA State National Hydrography Dataset (NHD) is the standard hydrography for Washington. NHD Lines represent linear NHD hydrographic landmark features used for cartographic representation. Some of these are: Bridge, Dam, Flume, Gate, Levee, Sounding Datum Line. NHD Lines should not be confused with NHD Flowlines which are the major blue line data. NHD Line data for Washington are developed at a resolution of 1:4,800 to 1:24,000. This dataset was extracted from and projected into WA State Plane Coordinates South. The National Hydrography Dataset (NHD) is a feature-based database that as a whole interconnects and uniquely identifies the stream segments or reaches that make up the nation's surface water drainage system. This high-resolution NHD, generally is developed at 1:24,000/1:12,000 scale, but many areas of Washington State have been improved to 1:4800 scale. NHD data was originally developed at 1:100,000-scale and exists at that scale for the whole country. Local resolution NHD is being developed where partners and data exist. The NHD contains reach codes for networked features, flow direction, names, and centerline representations for areal water bodies. Reaches are also defined on waterbodies and the approximate shorelines of the Great Lakes, the Atlantic and Pacific Oceans and the Gulf of Mexico. The NHD also incorporates the National Spatial Data Infrastructure framework criteria established by the Federal Geographic Data Committee. A detailed data dictionary is available at https://nhd.usgs.gov/userguide.html?url=NHD_User_Guide/Feature_Catalog/NHD_Feature_Catalog.htm

Input datasets: Washington State Department of Natural Resources: Transportation 2011 (roads only); Non-DNR Major Public Lands (2014) Washington State Department of Ecology: NHD 2014 (not pipeline, coastline, or Grays Harbor artificial path); HUC-12 Watersheds

The United States is divided and sub-divided into successively smaller hydrologic units which are classified into four levels: regions, sub-regions, accounting units, and cataloging units. The hydrologic units are arranged or nested within each other, from the largest geographic area (regions) to the smallest geographic area (cataloging units). Each hydrologic unit is identified by a unique hydrologic unit code (HUC) consisting of two to eight digits based on the four levels of classification in the hydrologic unit system. The second level of classification divides the 21 regions into 221 subregions. A subregion includes the area drained by a river system, a reach of a river and its tributaries in that reach, a closed basin(s), or a group of streams forming a coastal drainage area.Last Updated: March, 2018. GIS Metadata: https://fortress.wa.gov/ecy/gispublic/DataDownload/ECY_WAT_WBDWA.htmFor more information, contact Josh Greenberg, Washington State Department of Ecology, NHD Hydrography Data Steward, joshua.greenberg@ecy.wa.gov.

Input datasets: Washington State Department of Natural Resources: Transportation 2011 (roads only); Non-DNR Major Public Lands (2014) Washington State Department of Ecology: NHD 2014 (not pipeline, coastline, or Grays Harbor artificial path); HUC-12 Watersheds