Lake Menomin

Lake Menomin earns a D — measurements through 2025 show persistent nutrient pressure that limits clarity through the summer. With clarity and phosphorus scored, the sub-grades cluster within a letter of each other, pointing to stable conditions rather than one specific stressor.

Eutrophic conditions are the baseline here: clarity drops noticeably in late summer, and dissolved oxygen near the bottom can become a concern. A maximum depth of 34 ft puts Lake Menomin in the middle of Wisconsin's depth distribution. With 1,009 acres of surface and partial shoreline records, Lake Menomin is a large water by Wisconsin standards — recreational pressure is spread across a long shoreline. Lake Menomin sits at rank 2 of 3 in Dunn County, in the lower half of the local distribution.

Zebra mussel presence at Lake Menomin means the lake's clarity numbers carry an asterisk — filtered water is not the same as nutrient-poor water. Walleye are documented at Lake Menomin, one of 5 fish species on record for the lake. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.