$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

Sample Date	Temperature (°C)	Temperature (°F)	Included in Bacteria Geomean Calculation?	Daily Average Bacteria
09/23/2019	19.0	66.2	No	not sampled
09/16/2019	21.0	69.8	No	not sampled
09/09/2019	22.0	71.6	No	not sampled
09/03/2019	22.0	71.6	No	not sampled
08/26/2019	23.0	73.4	No	not sampled
08/19/2019	23.0	73.4	No	not sampled
08/12/2019	24.0	75.2	No	not sampled
08/05/2019	25.0	77.0	No	not sampled
07/29/2019	24.0	75.2	No	not sampled
07/22/2019	23.0	73.4	No	not sampled
07/15/2019	22.0	71.6	No	not sampled
07/08/2019	21.0	69.8	No	not sampled
07/01/2019	22.0	71.6	No	not sampled
06/24/2019	21.0	69.8	No	not sampled
06/17/2019	22.0	71.6	No	not sampled
06/10/2019	21.0	69.8	No	not sampled
06/03/2019	20.0	68.0	No	not sampled
05/28/2019	17.0	62.6	No	not sampled
05/20/2019	17.0	62.6	No	not sampled
05/13/2019	17.0	62.6	No	not sampled

Table Legend

Cell Color	Bacteria 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 – probable closure. For more information see Beach Closure Protocol

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