Watersheds, rivers and streams
King County watershed map
Click on the map below to find information about specific watersheds, rivers and streams including news, reports, data, activities, grants, and stewardship organizations. For info spanning multiple watersheds, see King County's watershed information page.
A watershed in King County is the land area draining to a nearby river or lake, or directly into Puget Sound.
King County rivers and watersheds
- Vashon - Maury Island
- Sammamish Watershed
- Snoqualmie - Skykomish River Watershed
- Cedar River - Lake Washington Watershed
- Green River Watershed
- White River Watershed
City of Seattle watersheds
Seattle urban watersheds
Urban creek watersheds not only are home to fish and wildlife, but help to filter stormwater before it enters lakes, the Duwamish River and Puget Sound.
Seattle watersheds (drinking water)
Information about Seattle's Tolt River and Cedar River watersheds, where Seattle and much of King County gets its drinking water.
City of Bellevue
Bellevue drainage basins
Bellevue has 25 drainage basins – areas of land that each drain to a stream or lake. City staff have prepared fact sheets that offer a snapshot of the built and natural conditions in each drainage basin.