Skokomish River, Washington State. Photo courtesy of Glenn Merritt, Environmental Assessment Program, WA Department of Ecology.

Attainment Monitoring Data

In January 2005, Mason Conservation District began monitoring in the Skokomish valley. The data will be used to:

We identified four main sampling locations from the 2000 water quality study. These are the places where bacteria concentrations need to be reduced – Weaver, Purdy, and Ten Acre Creeks, and at the Highway 106 Bridge. The Conservation District will monitor each of these stations, plus one “background” station (called mid-Skokomish) that is located above most of the development in the lower valley. Monitoring is planned every two weeks through November 2006, totaling 46 sampling events. The Conservation District will monitor according to a Quality Assurance Project Plan developed by the Department of Ecology. We will post results on this page monthly.

For each of the four main locations, the 2000 water quality study determined bacteria concentrations needed to protect commercial shellfish harvest in Annas Bay (‘’target concentrations”). Concentrations must meet two different targets for a sampling location to be considered “in compliance”:

In the data table, you will see the target concentrations for each location below the station name. For instance, Weaver Creek (17.5/100 ) indicates that the target GMV concentration for Weaver Creek is 17.5, and the target 90th percentile concentration is 100. No targets were established for the mid-Skokomish station because it is the background station.

Please review the data with the following in mind:

We will issue a final report on this monitoring effort by summer 2007. We will post it on this website.

 

Mason County:

Date 106 Bridge
(18.5/67.7)
Weaver Creek
(17.5/100)
Purdy Creek
(25.7/69.4)
10 Acre Creek
(25.6/100)
Mid-Skokomish
01/11/05 11 95 17 4.5 2
01/18/05 1/18 & 26/05 Mason Co autoclave failure. Have analysis only from Manchester.
01/26/05 1/18 & 26/05 Mason Co autoclave failure. Have analysis only from Manchester.
01/31/05 <1.8 2 4.5 6.1 <1.8
02/14/05 <1.8 <1.8 4.5 17 1.8
03/20/05 6.8 6.8 14 7.8 2
04/11/05 4.5 79 23 95 2
04/25/05 17 13 13 11 7.8
05/09/05 7.8 79 22 23 7.8
05/23/05 23 13 22 23 2
06/06/05 11 23 21 33 4
06/21/05 4.5 7.8 4.5 7.8 <1.8
07/05/05 11 33 33 4.5 4
07/18/05 49 23 31 4.5 2
08/01/05 33 23 23 7.8/13 13
08/15/05 13 13 23 23 2
08/29/05 79 33 46 11 33
09/12/05 17 13 49 7.8 no sample
09/26/05 23 79 23 7.8 dry
10/11/05 23 11 23 79 13
10/24/05 33 17 2 4.5 23
11/07/05 17 4.5 17 49 4.5
11/21/05 2 17 17 1.8 4.5
12/05/05 4.5 7.8 6.8 2 <1.8
12/19/05 33 79 49 240 2
01/03/06 <1.8 11 7.8 46 2
01/17/06 17 22 flooding flooding flooding
01/30/06 110 70 flooding flooding flooding
02/13/06 <1.8 2 <1.8 4.5 2
02/27/06 33 4.5 23 23 7.8
03/13/06 2 <1.8 3.7 <1.8 <1.8
03/27/06 2 <1.8 7.8 2 <1.8
04/10/06 6.8 2 6.8 14 <1.8
05/09/06 17  79 7.8 13 4.5
05/23/06 110 920 220 130 49
06/05/06     110 170 110 49 23
07/05/06 49 27 33 79 4.5
07/17/06 22 17 23 2 6.8
 07/31/06 33 7.8 79 46 4.5
 08/14/06 49 34 23 17 4.5
 08/28/06 26 23 46 23 no water
09/11/06 49 49 23 6.8 no water
09/25/06 70 13 33 2 no water

      

Manchester:

Date 106 Bridge
(18.5/67.7)
Weaver Creek
(17.5/100)
Purdy Creek
(25.7/69.4)
10 Acre Creek
(25.6/100)
Mid-Skokomish
01/11/05 7.8 350 13 6.8 2
01/18/05 70 330 no access 23 no access
01/26/05 4.5 1.8 2 4.5 2
01/31/05 1.8 1.8 2 7.8 4.5
02/14/05 2 13 1.8 6.8 1.8
02/28/05 1.8 7.8 33 1.8 1.8
03/14/05 1.8 3.7 1.8 23 4.5
03/20/05 N/A
04/25/05 6.8 13 49 23 4.5
05/23/05 11 23 33 13 1.8
06/20/05 7.8 4 13 13 7.8

 

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Last updated December 2014