Watershed Updates by WRIA

Watershed Updates by Water Resource Inventory Areas (WRIA)

A "watershed" is an area draining into a river, lake, or other waterbody. Ecology and other state natural resources agencies have divided the state into 62 "Water Resource Inventory Areas" or "WRIAs" to delineate the state's major watersheds.(1)

Learn about your watershed

Select a WRIA of interest from the list in the left column or from the map below to view environmental information (both at Ecology and from outside sources) for the watershed. You also may select a watershed by Zip Code.

For more information . . .

. . . on why watersheds are important, what threatens watershed health, things you can do, local examples of watershed stewardship, contacts for more information on various watershed topics, and more, see Working for Washington's Future: Healthy Watersheds, Healthy People.

1  Federal agencies frequently use an alternative watershed system based on USGS Cataloging Units or "HUCs" (Hydrological Unit Code). The federal system is similar to the WRIA system except that the basin groupings differ and the units extend beyond the Washington state boundary into Canada, Oregon, and Idaho.









Puget Sound

Columbia River

Spokane River Basin


Instream flows

Toxics cleanup site information

Water Cleanup Plans (TMDLs)