$name - King County

Magnuson Beach Off Leash Area 0826OLA

For algal toxin data please visit the State Toxic Algae web page and follow the “Find Lake” menu.

Please select a site and a year

The last year this beach was monitored is 2022. Please select a year from the drop down menu.

Table Legend

Cell Color	Fecal Coliform Value	Concern Level
	Individual day <= 200 CFU/100 ml	Low Concern - safe for swimming
	Individual day > 200 & <= 1000 CFU/100 ml	Moderate Concern – still safe for swimming
	Individual day > 1000 CFU/100 ml or geometric mean > 200 CFU/100 ml	High Concern – flagged for resample. For more information see Beach Closure Protocol – Fecal coliform bacteria

NOTE: Beach closure and reopening decisions are made by Public Health – Seattle & King County. Decisions are based on these results plus additional information about beach conditions, and may not always match the concern levels shown here.

Redirecting to NWToxicAlgae site...

Magnuson off-leash area is not a swimming beach and has no lifeguard on duty. This site is no longer monitored for fecal coliform bacteria as elevated bacteria appeared to be associated with dog activity in the water. However, the site is still monitored for algal toxins as pets are at risk if there is a toxic algae bloom present. For more information about algal toxins in lake water check out the State Department of Health Cyanotoxin web page.

Seattle Parks Department