Fawn Lake

Fawn Lake sits at the top of the Minnesota PCA grading rubric with an A, a mark reached by the cleanest lakes in Minnesota.

A TSI value of 34 puts Fawn Lake in the oligotrophic range, where biological productivity stays low and the water column remains clear. The lake bottoms out at 29 ft — a moderate depth that supports a warm-water fishery without the year-round cold refuge a deeper basin provides. At 46 acres, Fawn Lake sits below the Minnesota median: a small water where shoreline activity has an outsized effect on water quality. Fawn Lake ranks 31 of 132 in Cass County, putting it in the upper tier of locally monitored lakes.

No invasive species are currently listed at Fawn Lake — the lake remains off the Minnesota infested-waters roster. The state fisheries records do not list documented species for Fawn Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. The lake lacks a documented public access point, so visitor use is limited. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.