Every fall after the water quality monitoring activities end for the year (see “2016 Water Quality Monitoring Season Concludes“) I make a point of updating the Transparency and Total Phosphorus charts for Clary Lake, posting them on the website, and writing about them. I also share them with the Maine VLMP and the Maine DEP. These graphs now depict 41 years worth of data collected by certified water quality monitors from 1975 through the end of the just-ended 2016 season. Both graphs continue to show alarming trends, toward higher phosphorus levels and lower secchi disk readings. These trends are familiar to us, and go hand in hand: phosphorus feeds algae whose rapid growth reduces transparency. When transparency drops below 2 meters, you’ve got a bloom. As phosphorus levels trend up, transparency trends down. The trend lines of both graphs are clearly influenced by data from the last 10 years, and in particular, from the last 5. And we all know what’s been happening to Clary Lake over the last 5 years.
As mentioned, secchi disk readings below 2 meters (6.6′) signify an algae bloom in progress. As you can see from the above chart, prior to 2009 we didn’t record any secchi disk readings below 2 meters. In 2009 we experienced a severe algae bloom- Clary’s first- with secchi disk readings of 1.60m on 8/28/09 and 1.25m on 9/11/09. I don’t have any record of lake levels for that summer, but it was an exceedingly wet summer season with 22.9″ of rain recorded in Augusta for the 4 month period May, June, July, and August. That’s over half the average yearly rainfall, received in just 4 months. This would have resulted in significant runoff and undoubtedly played a major role in the algae bloom that summer. Continue reading








207-346-4640. You can also email the 
I don’t need to tell anybody that we need rain. For some time now we’ve been experiencing SEVERE drought conditions around Clary Lake and SEVERE to EXTREME drought conditions in and around New England, depending on locale. I found this neat CGI script at the 
