$name - King County

Mount Baker Beach 0820SB

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

This beach is currently closed

Sample Date	Temperature (°C)	Temperature (°F)	Included in Bacteria Geomean Calculation?	Daily Average Bacteria	Bacteria Geometric Mean – using the three most recent samples
08/04/2020	23.0	73.4	Yes	19	193
07/28/2020	23.0	73.4	Yes	3750	196
07/21/2020	22.0	71.6	Yes	101	18
07/14/2020	20.0	68.0	Yes	20	4
07/07/2020	18.0	64.4	Yes	3	2
06/30/2020	19.0	66.2	Yes	2	3
06/23/2020	20.0	68.0	Yes	4	3
06/16/2020	17.0	62.6	Yes	4	3
06/09/2020	16.0	60.8	Yes	2	2
06/02/2020	18.0	64.4	Yes	8	2
05/26/2020	16.0	60.8	Yes	1	3
05/19/2020	16.0	60.8	Yes	2
05/12/2020	15.0	59.0	Yes	11

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.

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Seattle Parks and Recreation