Description: 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