Low: Mpca Co-Located Site Four Mile Bay Lake

The LakeGrade rubric puts Low: Mpca Co-Located Site Four Mile Bay Lake at a C: clarity at 3.7 ft, 22 µg/L of phosphorus, and a TSI of 53 signal an intermediate trophic state. The lake's weakest score is on Secchi depth — the water looks more turbid than its phosphorus number alone would predict.

Eutrophic conditions are the baseline here: clarity drops noticeably in late summer, and dissolved oxygen near the bottom can become a concern. The lake's maximum depth is not yet documented in state morphometric records — context for its physical structure remains limited. The lake's surface area is not consistently recorded across state datasets — physical context remains partial. Low: Mpca Co-Located Site Four Mile Bay Lake sits at rank 7 of 11 in Lake of the Woods County, in the lower half of the local distribution.

Zebra mussels have been documented at Low: Mpca Co-Located Site Four Mile Bay Lake, which alters the filter-feeding balance and can paradoxically increase water clarity while disrupting the food web. The state fisheries records do not list documented species for Low: Mpca Co-Located Site Four Mile Bay Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. Public access is available — the lake is on the Minnesota PCA public-access list. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.