Question #7:
I read a report that said that in 2006 the Quarry Lake was inundated with sago pondweed. It was found in all parts of the lake, in very high density. The association members explored possibilities for eradication. The next three years however, there was virtually no sago pondweed to be found. Speculate on why 2006 might have been such a bad year for this submergent vegetation.
The map at the beginning of the thread was not taken in 2006
Clue above? 
