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Lake Sammamish
Lake Sammamish provides a habitat for a variety of fish, birds, and other wildlife. More than a million people in the region use it every year: fishing, swimming, boating, water skiing, or just enjoying the scenery.
Overview
The Lake Sammamish story
A high-level look at Lake Sammamish, its problems with phosphorus pollution, and factors affecting water quality in the lake.
Map of Lake Sammamish drainage area
Depicts the area that drains into Lake Sammamish; displays local streams and stream names along with parks, trails and natural areas.
Lake monitoring
Lake Sammamish monitoring overview
Overview of the lake including water quality graphs and data, and general metrics and statistics characterizing Lake Sammamish.
Water quality
Swimming beach data
Water temperature, bacteria, and algal toxins at King County beaches. Check Idylwood Beach and Lake Sammamish Beach for Sammamish readings.
Lake buoy data
*Regular measurements of water depth, temperature, specific conductance, dissolved oxygen, turbidity, pH, and fluorescence-derived chlorophyll (total algae) and blue green algae (BGA) concentrations.
*Three profiles per day in winter; six profiles per day in spring, summer, and fall.
Greening your shoreline
A tool for lakeshore property owners on Lake Washington and Lake Sammamish to improve shorelines for people and salmon.
Wildlife
Lake Sammamish kokanee
Learn about the dwindling population of genetically distinct kokanee in Lake Sammamish, and actions that King County and other agencies are taking to protect and restore them.
Lake Sammamish Urban Wildlife Refuge Partnership
An extensive effort to support conservation of fish and wildlife in the Sammamish Basin, and contribute to the quality of life for current residents and future generations.
Recreation
Swimming beaches
Idylwood Beach and Lake Sammamish Beach are the two swimming beaches on Lake Sammamish. Check our Lake Swimming Beach page for algae, bacteria, and temperature information.
East Lake Sammamish trail
Non-motorized transportation corridor and multi-use recreational trail along 11 miles of the former Burlington Northern Santa Fe railroad corridor on the east side of Lake Sammamish.