Matthews Beach Park

address

The Watershed | All about the Thornton Creek Watershed (thorntoncreekalliance.info) Thornton Creek drains a 7,402-acre (11.6 sq. mile) urban watershed in northwestern King County. The Thornton Creek watershed extends roughly between Puget Sound and Lake Washington, extending from NE 190th St. in the City of Shoreline to NE 80th St in the City of Seattle. Thornton Creek enters Lake Washington at Matthews Beach Park, and Lake Washington drains by way of the Lake Washington Ship Canal to Puget Sound.