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King County Swimming Beach Monitoring


If you have question on this site, please contact Debra Bouchard (206) 477-4650.

Lake Sammamish Beach 0615SB

Please select a site   and a year  

Sample Date Temperature
(°C)
Temperature
(°F)
Included in Fecal Geomean Calculation?Fecal ColiformFecal Coliform Geometric Mean
09/15/2014 Yes1140
09/08/2014 22.0 71.6 Yes32067
09/04/2014 21.0 69.8 Yes2669
09/02/2014 24.0 75.2 No0 
08/25/2014 25.0 77.0 Yes2281
08/18/2014 27.0 80.6 Yes5244
08/11/2014 27.0 80.6 Yes15064
08/04/2014 27.0 80.6 Yes36035
07/28/2014 26.0 78.8 Yes6017
07/21/2014 23.0 73.4 Yes015
07/14/2014 28.0 82.4 Yes35022
07/07/2014 23.0 73.4 Yes77
06/30/2014 24.0 75.2 Yes117
06/23/2014 24.0 75.2 Yes384
06/16/2014 18.0 64.4 Yes64
06/09/2014 23.0 73.4 Yes14
06/02/2014 22.0 71.6 Yes10 
05/27/2014 Yes1 
05/19/2014 16.0 60.8 Yes31 
05/12/2014 16.0 60.8 Yes6 

Table Legend

Cell Color Fecal Coliform Value Concern Level
symbol for low concern symbol for low concern Individual value < 200 CFU/100 ml Low Concern - safe for swimming
symbol for moderate concern Individual value >= 200 & < 1000 CFU/100 ml Moderate Concern – still safe for swimming
symbol for high concern Individual value >= 1000 CFU/100 ml
or geometric mean >= 200 CFU/100 ml
High Concern – flagged for resample. For more information see Beach Closure Protocol – Fecal coliform bacteria
NOTE: If the routine sample exceeds the standard, either a single sample that exceeds 1000 CFU/100ml or a geometric mean of the five most recent samples that exceeds 200 CFU/100ml, then re-sampling is triggered.



Sample DateMicrocystin (µg/L)Anatoxin-a (µg/L)
09/08/2014<MDL 
09/02/2014<MDL<MDL
08/25/2014<MDL 
08/18/2014<MDL<MDL
08/11/2014<MDL 
08/04/2014<MDL<MDL
07/28/2014<MDL 
07/21/2014<MDL<MDL
07/14/2014<MDL 
07/07/2014<MDL<MDL
06/30/2014<MDL 
06/23/2014<MDL<MDL
06/16/2014<MDL 
06/09/2014<MDL<MDL
06/02/2014<MDL 

Table Legend

Cell Color Algal Toxin Value Concern Level
symbol for low concern symbol for low concern Anatoxin < 1 µg/L and Microcystin < 6 µg/L below state recreation guideline
symbol for high concern Anatoxin >= 1 µg/L or Microcystin >= 6 µg/L value above state recreation guideline. See Swimming Beach Closure Protocol – Toxic Algae

Note: Additional toxic algae data is available on the NW Toxic Algae webpage.