King County Major Lakes Monitoring Program Water Quality Monitoring on Lakes Washington, Union, and Sammamish Site Links Major Lakes Monitoring Home Monitoring Program History Lake Washington Lake Union Lake Sammamish Graphs and Data Trophic State Index Algae Bloom Reports Swimming Beach Monitoring Lake Washington elevation Lake Sammamish elevation Related Links Other Lakes Web Sites Lake Washington Hydrograph RUSS Buoy Page Streams Monitoring Lakes Stewardship Program Aquatic Plants The Lakes Monitoring Program is part of the King County Department of Natural Resources, Water and Land Resources Division. We are committed to monitoring the water quality of the County's lakes to ensure their continued health, as well as the health of the public who utilize the lake's many resources. We invite you to learn more about our program by looking through the pages listed below. This site contains detailed graphs of water quality data, photographs of water sampling, and general information about the water quality of King County's lakes. Magnuson Park Boat Launch Closure Magnuson Park Motorized Boat Launch Closed for Opening Day of Boating Season. Boat Ramp will Re-Open on May 15 The Sweep - 6th Annual Lake Union and Porage Bay Cleanup Volunteers in kayaks & other small boats pick up & transfer trash to larger craft for transport to shore. Shore cleanup will be done around the lake involving non-boaters. Lakes Presentations View presenations on lake topics by King County staff on the Science Seminar Web site. Graphs and Data King County conducts routine monitoring on the three major lakes in the county. Browse a map of the sites that are currently monitored in the program, view information about the lakes and watersheds, view data graphs, and download data. Lakes Monitoring Program History The Major Lakes Monitoring Program is designed to protect the significant investment in water quality improvement and protection made by the people of King County. Learn more about the purpose and history of the Lakes Monitoring program, what parameters are analyzed and how samples are collected. Lake Washington Lake Washington is the largest lake in King County and the second largest natural lake in Washington State. It is also one of the best examples of lake clean up by the diversion of sewage. Learn more about the history, hydrology, bathymetry, and physical characteristics of Lake Washington and its watershed. Lake Union Lake Union is the most urbanized of the three major lakes in King County. It is also unique in that is has direct access to Puget Sound via the Hiram Chittenden locks. Learn more about the hydrology, bathymetry, and physical characteristics of Lake Union and its watershed. Lake Sammamish Lake Sammamish is the sixth largest lake in Washington and the second largest in King County and is one of the major recreational lakes with high use by fishermen, boaters, water skiers, swimmers, and picnickers. Learn more about the hydrology, bathymetry, water quality goals, and physical characteristics of Lake Sammamish and its watershed. Algae Blooms Green algae and cyanobacteria (blue-green algae) blooms periodically occur in King County lakes. Learn more about this phenomenon and the organisms and factors that cause it. Read about the current cyanobacteria bloom in Lake Washington (11/21/2007). Trophic State Index One way to characterize the health of lakes is by the numerical Trophic State Index (TSI). Learn about theTSI and what roles chlorophyll-a, Secchi depth, and phosphorus play in determining lake health.

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