$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

Sample Date	Temperature (°C)	Temperature (°F)	Included in Bacteria Geomean Calculation?	Daily Average Bacteria	Bacteria Geometric Mean – using the three most recent samples
09/23/2019	19.0	66.2	No	not sampled
09/16/2019	21.0	69.8	Yes	47	14
09/09/2019	22.0	71.6	Yes	4	11
09/03/2019	24.0	75.2	Yes	15	16
08/26/2019	23.0	73.4	Yes	25	10
08/19/2019	23.0	73.4	Yes	11	10
08/12/2019	23.0	73.4	Yes	4	11
08/05/2019	24.0	75.2	Yes	24	12
07/29/2019	23.0	73.4	Yes	16	7
07/22/2019	22.0	71.6	Yes	5	15
07/15/2019	22.0	71.6	Yes	6	21
07/08/2019	21.0	69.8	Yes	123	11
07/01/2019	21.0	69.8	Yes	14	6
06/24/2019	19.0	66.2	Yes	1	15
06/17/2019	21.0	69.8	Yes	20	56
06/10/2019	21.0	69.8	Yes	203	49
06/03/2019	19.0	66.2	Yes	45	15
05/28/2019	15.0	59.0	Yes	13	5
05/20/2019	16.0	60.8	Yes	7
05/13/2019	16.0	60.8	Yes	2

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