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Water recreation
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.