Watersheds
Find articles, maps, and other content tagged by any of the 21 watershed sub-basins in the Puget Sound area. The geospatial boundaries below represent the 4th level (8-digit) hydrologic unit boundaries of the Watershed Boundary Dataset (WBD) layer for Washington. Data source: The U.S. Department of Agriculture, Natural Resources Conservation Service.
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Puget Sound watershed hydrologic units
There are many ways of defining the boundaries of the Puget Sound watershed. Hydrologic unit codes (HUCs) are nationally standardized divisions that are often used by conservation agencies and national organizations.
Water Resource Inventory Areas in Puget Sound
The Washington State Department of Ecology and other state natural resources agencies have divided the Washington into 62 "Water Resource Inventory Areas" or "WRIAs" to delineate the state's major watersheds.