2013 WATER QUALITY REPORT by Jim Martel
Last year was a tough one on lake water quality. The above average rainfall throughout
the summer caused much more runoff to enter the lake carrying with it more sediment and
phosphorus. The sediment lowered the transparency and the phosphorus caused more algae to
grow. The average Secchi disk sighting went from about 12 feet in depth in 2012 to just 10 feet
For the first time in the 10 years I've been involved in monitoring lake water quality, I
saw two blue-green algae or cyanobacteria blooms last year, both in late August. The good thing
is now I know what they look like. I would describe them as not blue-green in color but more
like a lime green (see pictures ). This bloom was only about a foot wide and occurred along the
shore in calm conditions. I scooped up a sample and brought it to DES for analysis. They found
approximately 1 million cyanobacteria/milliliter, which is quite high. If you see something like
this give me a call (632-7594) and don't swim in it or allow your pets to drink it. Cyanobacteria
can produce a toxin which becomes concentrated during a bloom.
Don't confuse a pine pollen "bloom"with a blue green algae bloom. Although similar in
color, the pine pollen bloom usually occurs in June and the pine pollen is dispersed on land as
well as water. The green dust on your car is pine pollen.
One way to reduce or eliminate algae blooms is to reduce the amount of phosphorus in the lake.
Much of the phosphorus is carried into the lake with the sediment and overland runoff. We can
help to reduce this input by intercepting all overland flow and forcing it to filter through the
ground, where physical, biological and chemical processes capture and hold the phosphorus. See
8.pdf) for information on how you can control runoff from your property.
One piece of good news; Scotts no longer has phosphorus in its lawn fertilizer. Other
fertilizer manufacturers are expected to follow suit. This should be a great help in reducing
phosphorus in lakes. Time will tell.
I'm hoping that the spring snowmelt will be slow this year, for water quality's sake.