Washington State Department of EcologyA geodatabase of 387,237 points statistically chosen from the February 2005 version of the Washington DNR Hydrography layer representing stream site locations. For details, see the Design Documentation created by 3/18/2006 by Tony Olsen (U.S. EPA) and Janelle Black (NW Indian Fisheries Commission). The design document is available from the Washington State Department of Ecology at https://fortress.wa.gov/ecy/gispublic/DataDownload/documents/EPA_ENV_MasterSampleDesign.pdf.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/909ccf6288204e28af9c77ba41d9ad0d_1engState of Washington Geospatial Open Data PortalPublicMaster Sample Sites [Washington (State)]Web servicesWashington (State)Last Modified: 2025-12-29