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Water recreation

Find information about King County lakes and swimming beaches, King County's Olympic-sized swimming pool, Weyerhaeuser Aquatic Center, and safety for swimmers and boaters.

Weyerhaeuser Aquatic Center

Look up class schedules and find out how to register, and learn about current projects at the aquatic center.

Lake swimming beach bacteria and temperature

Look up swimming conditions at more than two dozen popular swimming beaches at King County lakes during the season from mid-May to mid-September.

Small lakes water quality monitoring data

Use maps to find charts of water temperature, dissolved oxygen, pH, conductivity, nitrogen, phosphorus, chlorophyll, secchi depth, fecal coliform count, and E. coli count in small lakes around King County.

Major lakes water quality monitoring data

Look up charts of water quality metrics for sampling sites on Lake Washington and Lake Sammamish.

Lake buoy data - water column

Look up data for the water column at buoy locations on Lake Washington and Lake Sammamish.

Water safety

Info and advice for boaters and swimmers including a list of local swimming areas with lifeguards, affordable life jackets and tips for safety on rivers and in pools and spas.