Inguadona Lake

Inguadona Lake sits at the top of the Minnesota PCA grading rubric with an A, a mark reached by the cleanest lakes in Minnesota. With clarity and phosphorus scored, the sub-grades cluster within a letter of each other, pointing to stable conditions rather than one specific stressor.

Mesotrophic conditions dominate at Inguadona Lake: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. The lake's 79 ft maximum depth is in the upper tier for Minnesota — deep enough for cold-water fish to find refuge in summer. Inguadona Lake covers 1,133 acres alongside 11.0 miles of shoreline, large enough that conditions can vary meaningfully between bays. Among the 132 graded lakes in Cass County, Inguadona Lake sits at rank 63, above the county median.

Inguadona Lake is on the Minnesota infested-waters list for zebra mussels — boaters should follow clean-drain-dry protocols when moving gear to or from the lake. Muskie are on the species list at Inguadona Lake, among the lake's 20 documented fish. Public access is available — the lake is on the Minnesota PCA public-access list. Ice-out has been recorded 12 times at Inguadona Lake, with a median around Apr 22. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.