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Lakes

Lakes in King County, Washington

Find comprehensive services, data and information related to lakes in King County, Washington.

To offer a suggestion or report an error on the King County lakes website, please contact Fred Bentler, webmaster.

King County, Washington lakes

Lake Washington information
King County, Washington

Lake Washington shoreline

Lake Washington description and characterisitcs
Overview of the lake including water quality graphs and data, and general metrics and statistics characterizing Lake Washington.

Lake Washington story
The big picture story about Lake Washington, its problems with phosphorus pollution and factors that degrade the lake's water quality.

Quick facts on Lake Washington
Brief bullet points describing water quality and fish habitat.

Greening your shoreline
A tool for lakeshore property owners on Lake Washington and Lake Sammamish to improve shorelines for people and salmon.

Water quality data

Swimming beach bacteria and algal toxin levels, and water temperature
Contains a map depicting the locations of current swimming beach sampling stations in King County. To view the current bacteria and temperature data, either click on the map or select from the list of beaches. It also contains links to archived data.

Real-time combined sewer overflow status
Look up the status of sewer overflows along Lake Washington and other locations in the Seattle area.

Tributary stream water quality data

Parks, trails and recreation

Boating regulations fact sheet
Boating restrictions, equipment requirements, safety, aquatic weed, and other related information. (Washington State marine laws also affect King County boaters.)

Burke Gilman Trail
A paved, off-road facility over its entire length with the exception of an on-road segment in Ballard.Runs more than 18 miles from Shilshole Bay in the City of Seattle to the City of Bothell where it intersects the Sammamish River Trail.

Lake Washington aerial photo

Drainage basin information

Cedar River-Lake Washington watershed

Cedar River - Lake Washington watershed map
Drainage map displaying streams, lakes, drainage divides, major roads and cities in the area that drains to Lake Washington and out the Hiram M. Chittenden Locks, except for the Sammamish Watershed area. The map is in Acrobat format. File size is 445 Kb.

Sammamish watershed

Salmon and salmon recovery

Salmon in the greater Lake Washington watershed
Fish distribution and Salmon Watcher Site maps.

Salmon restoration in the greater Lake Washington watershed
Salmon plans, volunteer and funding opportunities, news and other information.

Salmon Watcher Program
Salmonid species information and illustrations of fish that you may see in your stream.

Studies/reports

Lake Washington Existing Conditions Report: A report on Lake Washington water quality
Water quality trends and conditions in Lake Washington from 1990 to 2001. Summarizes lake conditions and how Lake Washington has responded to human activities that have changed the watershed.

Sediment Quality Evaluation in Lake Sammamish, Lake Union, and Lake Washingon, Washington State
The Sediment Quality Triad (SQT) approach to sediment quality evaluation was used to characterize and assess the extent of altered benthic invertebrate assemblages, sediment contamination and toxicity.

Water Quality Monitoring of Five Mercer Island Drainage Basins from 2008 - 2010
Monitoring results of projects to minimize degraded runoff into Lake Washington, remove silt and control erosion.

Major Lakes Continuous Temperature Study: Interim Progress Report
Aquatic ecosystem responses to changing climate in the three major lakes routinely monitored by King County.

Highway 520 Bridge Storm Water Runoff Study
Part of a comprehensive evaluation of current and future water quality conditions in Lake Washington to support informed decision-making.

Lake Washington Shoreline Master Programs - by jurisdiction

For questions about Lake Washington, please contact Sally Abella, senior engineer, Lake Stewardship Program.

Related information

Related agencies

News and announcements

May 22, 2013
King County urges caution on lakes, rivers over the long Memorial Day weekend
Officials stress importance of using personal flotation devices when on open water

Jan. 7, 2013
External article, Seattle Times
Lake Washington sockeye topic of Tuesday meeting

Sept. 26, 2012
Executive Constantine applauds unanimous vote to adopt long-term pollution control plan

Aug. 6, 2012
External article, Seattle Times
Lake Washington chinook counts near 16-year average, and sockeye numbers are decreasing

Green Shorelines blog (external)
Lake Washington and Lake Sammamish

Jun. 14, 2012
External article, Seattle Times
Take a walk, or a canoe tour, in Lake Washington's largest wetland

Apr. 27, 2012
King County reminds boaters to steer clear of data buoys on lakes Washington, Sammamish

» Archived Lake Washington news