King County Courthouse Third Avenue entrance closed until January 1, 2020. Please use alternative routes.  
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Lake Wilderness Beach O717SB

For algal toxin data please visit the State Toxic Algae web page and follow the “Find Lake” menu.

NOTE: Lake Wilderness is monitored through a contract with the City of Maple Valley and may have a different sampling frequency. ALGAL TOXIN samples are only collected during bloom events and submitted through the Washington State Toxic Algae Program. For more information visit the Washington State Toxic Algae Program database website.
Washington State Toxic Algae Program database