T-dock measurements on 4/20/2025: Secchi Depth 2.4 meters (7.9 ft), Temperature 14.0 C (57.2 F)
Secchi depth (pronounced sek-ee) is a water transparency measurement. Monitors use a black and white Secchi disk, noting how dep the disc can be submerged in water and still be visible. Volunteers monitor the clarity and temperature of the lake weekly. Learn more about how we monitor and treat the water.
Weekly water clarity and temperature data are posted on the King County Lakes website (click on Geen-1 and Green-2).
FOGL Chair, Rob Zisette, winner of the 2023 Secchi Disk Award
2023 Secchi Disk Award recognizes Rob Zisette for outstanding leadership and passion for lake protection
Washington State Lake Protection Association
Swimming Safety Tips
Routine water testing has ended for 2024 and will resume in mid-May 2025. Check back next summer to find a healthy beach!
Rainy Season Safety
- Swim safely during the rainy season! Stay out of the water for 24 hours after heavy rainfall. When it rains, poop and germs get washed from land into the water.
- Keep an eye out for harmful algae blooms, which can make people and animals sick. Some types of harmful algae can grow more in the fall. Learn more about how to stay safe around harmful algae blooms by watching this video from the CDC: You can find the most recent data for toxic algae in Washington at nwtoxicalgae.org. And the table and map below will continue to show any beaches or lakes that are closed due to toxic algae.
- Also check the Combined Sewer Overflow website, to see if a combined sewer overflow is occurring before going swimming, wading, fishing or boating. Stay out of the water near an overflow for 48 hours after a sewage and stormwater overflow.
- Water recreation links:
Source: King County Water Recreation