Volunteer monitoring began at Grass Lake in 2002 and continued through 2008, after which it was discontinued. The data suggested that this lake was moderately colored and high in primary productivity (eutrophic) with fair water quality. However, over the last few years the lake became so shallow during summer that the sample station could not be reached, so monitoring only occurred in late spring through early summer.
Grass Lake has no public access boat ramp, but residents should monitor aquatic plants growing nearshore to catch early infestations of Eurasian watermilfoil, Brazilian elodea or other noxious aquatic weeds.
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The average of these three TSI indicators during the growing season can be used to place lakes in one of three broad categories: <40 = oligotrophic (low productivity), 40 to 50 = mesotrophic (moderate productivity) >50 = eutrophic (highly productive).
