Washington State Department of EcologyNHD_MajorStreams are a subset of the largest linear stream/river features selected from the High Resolution NHD dataset for Washington State. This subset includes only NHDflowlines that have GNIS Names that include "River", or have a Stream Order greater than 7, or have a GNIS Name that includes "Creek" and is longer than 24 km. 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. Some GNIS names in this data are offensive so the word "Negro" has been replaced with "historical name" while the process of reviewing and changing the names is ongoing through official channels.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/1deded9ca468406c802bfd5190be602b_13engState of Washington Geospatial Open Data PortalPublicHydrography - Major Streams [Washington (State)]Web servicesWashington (State)Last Modified: 2025-08-14