King County, Washington : hydrological Water Resource Inventory Area (WRIA) boundaries
King County, Washington, Water Resource Inventory Areas as defined by the King County Department of Natural Resources and Parks, Water and Lands Resources Division. The highest level of hydrological boundaries. WRIA > WATERSHED > HYDROBASIN > CATCHMENT(DRNBASIN). Covers also Snohomish and Pierce counties, and portions of other surrounding counties.