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Watersheds, rivers, streams and lakes

Find water and land info and services by watershed area in King County including studies, data, activities, grants, and much more.
King County map of watersheds
Map of major watersheds in King County

Watersheds of King County

Basin Stewards

Basin Stewards work with residents to answer questions about best management practices

Central Puget Sound Watershed

Find info and services for land draining directly to Central Puget Sound including Vashon Island.

Cedar River - Lake Washington Watershed

Learn about the rivers, streams, lakes and the land area draining to the Cedar River, Lake Washington and flowing out the Hiram Chittenden Locks.

Sammamish Watershed

Learn about the land and waters that flow into Lake Sammamish and out the Sammamish River into Lake Washington.

Snoqualmie - Skykomish River Watershed

Learn about the King County rivers, streams, lakes and the land area draining to the Snoqualmie River, Skykomish River and flowing out the Snohomish River to Port Gardner Bay

Green - Duwamish River Watershed

Learn about the land and waters that flow into the Green River and out the Duwamish into Elliott Bay.

White River Watershed

Learn about the King County rivers, streams, lakes and the land area draining to the White River and out to the Puyallup and Commencement Bay.

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