$name - King County

Lake Wilderness Beach O717SB

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
08/15/2019	24.0	75.2	Yes	22	79
08/12/2019	24.0	75.2	Yes	141	223
08/05/2019	26.0	78.8	Yes	165	139
07/29/2019	23.0	73.4	Yes	480	62
07/25/2019	23.0	73.4	Yes	34	53
07/22/2019	24.0	75.2	Yes	15	162
07/18/2019			Yes	306	359
07/15/2019	23.0	73.4	Yes	931	239
07/08/2019	21.0	69.8	Yes	163	65
07/02/2019	22.0	71.6	Yes	90	51
07/01/2019	23.0	73.4	Yes	19	81
06/26/2019	21.0	69.8	Yes	82	176
06/24/2019	24.0	75.2	Yes	349	281
06/17/2019	21.0	69.8	Yes	193	116
06/10/2019	22.0	71.6	Yes	331	64
06/03/2019	22.0	71.6	Yes	25	38
05/28/2019	20.0	68.0	Yes	33	40
05/20/2019	18.0	64.4	Yes	68
05/13/2019	20.0	68.0	Yes	30

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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NOTE: Lake Wilderness is monitored through a contract with the City of Maple Valley and may have a different sampling frequency. ALGAL TOXIN samples are only collected during bloom events and submitted through the Washington State Toxic Algae Program. For more information visit the Washington State Toxic Algae Program database website.
Washington State Toxic Algae Program database