Milfoil
Post-Treatment Laboratory Results
You can find the most up-to-date information here.
2008
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.
2007
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
