P.O. Box 133
 Cocolalla, ID  83813




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Milfoil Post-Treatment Laboratory Results


You can find the most up-to-date information here.



September 11, 2008 Survey Findings

On Thursday, September 11th, 2008 Dave Kluttz and Steve McClain of Lakeland Restoration Services performed the third survey on Cocolalla Lake in 2008. Eurasian Watermilfoil treatments were performed in 2006 and 2007.


A littoral survey consisting of 83 points were performed, including areas where Eurasian Watermilfoil has historically been found.  Secci readings were taken.  Dissolved oxygen readings were provided by Cary Poston.


Most submerged plants found were potamogeton species.  Coontail and Elodea were also discovered, as in the previous surveys.  Chara and Naid were also found.  These organisms exhibit annual growth in the Pacific Northwest.


An array of emerged and floating plants was noted as well.  Watershield and pondlillies were noted along the East and South end of the lake.


Potamogeton Crispus (Curly Leaf Pondweek) was noted in 5 locations.


Beaches were combed for evidence of Eurasian Watermilfoil.  None was found.


For full report, click here.



July 18, 2008 Survey Findings

On Friday, July 18th, Dave Kluttz and Steve McClain of Lakeland Restoration Services performed the second survey for Cocolalla Lake after milfoil treatments in 2006 and 2007.


74 points were surveyed in the littoral areas where Eurasian Watermilfoil (EWM) has been found historically.  Secci readings were taken.  Dissolved oxygen readings were provided by Cary Poston with the Cocolalla Homeowner's Association.


Most submerged plants discovered were potamogeton species with the exception of Coontail and Elodea.  Emerged plants found were yellow pondlily, watershield and bull rush.


Filamentous algae (green) was noted at the south end of the lake in the shallows.


During the survey, beaches were combed for evidence of EWM.


No EWM was noted during the survey.


For full report, click here.



June 6, 2008 Survey Findings

Lakeland Restoration Services conducted a spring aquatic plant survey of Cocolalla Lake.  Both random and predetermined points were sampled around the lake.  No Eurasian Watermilfoil was found.


Many potamogeton species (pondweeds) and dicots, such as yellow pond lilies, coontail, and elodea were collected and noted.  The plants were beginning their growth cycle due to abnormally cool weather and extremely high precipitation this winter and spring.


Secchi disk readings, dissolved oxygen and temperature readings were take near the inlet at the south end of the lake and near the outlet at the north end of the lake.  The Secchi reading at the south end of the lake was one meter and it was two meters at the north end.  Spring runoff was still high at the time the Secchi readings were taken.  The contrast may be due to silt entering the inlet streams and settling out before reaching the outlet.


The next survey is planned for middle to lake July.





July 12, 2007 Post Treatment

Click here to see post treatment laboratory results for the Cocolalla Lake Milfoil herbicide treatment which was completed on Tuesday, July 10, 2007.  These first water samples were taken Thursday morning.


The next laboratory tests will be taken on Monday morning, July 16th.  As soon as the results from the second set of samples are received they will be posted on the website.


Regarding these laboratory tests, Project Manager Sandy Daniel said, "The results (from Thursday's tests) were all too high to lift drinking water and irrigation restrictions for the weekend.  None were exceptionally high and I'm sure that Monday will be a different story.)


Tim Stein, Idaho Department of Agriculture, who observed the herbicide treatment in Cocolalla Lake, asked that the laboratory results be posted on the Association website. 



July 16, 2007 Post Treatment

For post Milfoil treatment laboratory results which were taken on 7-16-07, please click here.


The result for the area in which Diquat was applied was below EPA label levels for all use.

The residual levels for the areas which were treated with 2,4-d are coming down a little slower than anticipated.  The samples taken on the morning of the 16th were still above the EPA label amounts for drinking water and irrigation of plants that would be sensitive to 2,4-d.  There are no label restrictions on use of water from areas treated with 2,4-d for fishing, watering of livestock, or other domestic purposes.


Sandy Daniel, Project Manager, will continue taking samples in areas treated with 2,4-d until the results are below the EPA requirements for drinking water and irrigation. 



July 23, 2007 Post Treatment

Post treatment samples in Cocolalla Lake were taken on July 23. To see these test results click here.  The next samples will be taken on July 30.



July 29, 2007 Post Treatment

To review the final Cocolalla Lake post milfoil treatment water samples, click here.  All herbicide levels were well below the EPA drinking water standards and all restrictions have been lifted. 


Current observations indicate that the treatment was very successful.  A Post Treatment survey of the lake will conducted by the Idaho Department of Agriculture in September and the results will be posted here.


The CLA Milfoil Committee wishes to thank everyone in the community for their support in the important project for Cocolalla Lake.

Post Treatment Results

July 12, 2007

July 16, 2007

July 23, 2007

July 29, 2007


Last modified: 03/05/2010
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