Hydrologic Unit Boundaries, 6th level (HUC6) - Washington

This shapefile is a subset of the original data, containing only those HUC6s which intersect significantly with Washington State borders. It has been clipped to the Washington State border. The HUC6 watersheds have been attributed with the study's analysis regions for summary. Original metadata follows:

This geospatial dataset is a hydrologic boundary layer containing nested hydrologic unit boundaries. The standard allows for mapping to the (16-digit) level. The dataset was developed by delineating the boundary lines on 1:24,000 base maps and digitizing the delineated lines. Digital Elevation Model data was used in part of the process to establish preliminary boundaries.

This data set consists of geo-referenced digital map data and associated attributes. The hydrologic unit code attached to each delineated polygon is linked to the attribute data, which can contain information on area in acres, non-contributing area, state(s) the HU falls within, name for 7th and 8th level HU, 5th and 6th level code for downstream hydrologic unit, and hydrologic unit modifications. Each line has attributes that describe the HU level (1-8), originating source for that line and a metadata ID number that links the line to its associated metadata file.