For questions about the King County  Swimming Beach Monitoring Program, please contact Dean Wilson, Program Manager

For questions about the Swimming Beach Web site, please contact Daniel Smith

Hidden Lake

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Sample DateFecal ColiformTemperature (C)Temperature (F)
9/15/20093313.055.0
9/8/20099913.055.0
8/31/20091,30014.057.0
8/24/20093813.055.0
8/18/20093413.055.0
8/11/20094,10014.057.0
8/4/20099415.059.0
7/28/200926016.061.0
7/21/20098814.057.0
7/14/200918013.056.0
7/7/20096714.057.0
6/29/20093813.055.0
6/23/20091413.055.0
6/15/20091214.057.0
6/9/20092214.057.0
6/2/2009214.057.0
5/26/20095714.056.0
5/18/20092213.055.0
5/12/200923  
Fecal Coliform Geometric Mean
89
233
230
167
197
276
121
101
56
38
25
12
13
15
17
-99
-99
-99
-99

Table Legend

Cell Color Fecal Coliform Value Concern Level
Individual value < 200 CFU/100 ml Low Concern
Individual value > 200 & < 1000 CFU/100 ml Moderate Concern
Individual value > 1000 CFU/100 ml
or geometric mean > 200 CFU/100 ml		 High Concern


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Updated: 9/22/2009