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

Thornton Creek

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Sample DateFecal ColiformTemperature (C)Temperature (F)
9/22/200928015.059.0
9/15/20091,30016.061.0
9/8/200969015.059.0
8/31/200946016.061.0
8/25/20091,30015.059.0
8/18/200920016.061.0
8/11/200928,00017.063.0
8/4/200952017.063.0
7/28/200927018.064.0
7/21/200932016.061.0
7/14/200946015.059.0
7/7/200939014.057.0
6/29/200932014.057.0
6/23/200924013.055.0
6/15/200914015.059.0
6/9/200918016.061.0
6/2/200926015.059.0
5/26/200912014.056.0
5/18/200920015.059.0
5/12/20094410.050.0
Fecal Coliform Geometric Mean
684
640
1182
1117
1004
759
896
381
346
338
286
237
219
180
174
138
-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

We suggest you avoid contact with this creek due to high bacteria levels
Seattle Parks Department

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Updated: 9/22/2009