Excessive Nutrients

Excess nutrients, primarily phosphorus and nitrogen, are a problem in Mona Lake. These nutrients provide a food source for many unwanted plants including aquatic milfoil, purple loosestrife, and algae. These nutrients can come from fertilizers, decomposing plant materials such as grass clippings and leaves, and manure. Our local Mona Lake Improvement Association currently chemically treats parts of Mona Lake in order to keep the plants and algae from restricting lake use. Below are pictures of some nuisance algae/plants in Mona Lake.

Nuisance Algae / Plants

Results of the work by Grand Valley State University's Annis Water Resources Institute indicate that 75% of the flow entering Mona Lake is from Black Creek. As a result, in order to get the most bang-for-the-buck, best management practices (BMPs) to reduce phosphorus to Black Creek would go a long way to improving the health of the lake.

Additional measures to reduce nutrients to the lake and creeks would include  people using phosphorus-free fertilizers on their lawn, and reducing the number of times annually that they fertilize. We have produced several newsletters with various tips on how citizens can do their part to reduce nutrients to the watershed.

An additional source of nutrients to Mona Lake is from internal lake loading. This sediment build-up on the lake bottom is the result of years of wastewater discharges to Little Black Creek.