Minnewawa Lake

Minnewawa Lake pulls a D on the LakeGrade rubric — phosphorus loading and limited clarity hold it below the Minnesota average.

Eutrophic conditions are the baseline here: clarity drops noticeably in late summer, and dissolved oxygen near the bottom can become a concern. The lake bottoms out at 21 ft — a moderate depth that supports a warm-water fishery without the year-round cold refuge a deeper basin provides. With 2,351 acres of surface and 18.6 miles of shoreline, Minnewawa Lake is a large water by Minnesota standards — recreational pressure is spread across a long shoreline. Within the 53 graded lakes of Aitkin County, Minnewawa Lake sits at rank 40, near the bottom of the county list.

Minnewawa Lake has no invasive species recorded in Minnesota state databases as of 2020, though prevention practices still apply at all access points. The fishery includes walleye among the lake's 15 documented species — a notable draw for Minnesota anglers. Public access is available — the lake is on the Minnesota PCA public-access list. Ice-out has been logged at Minnewawa Lake more than two dozen times, putting the median around Apr 18 — a useful baseline for tracking climate trends. Monitoring depth is thin here: the LakeGrade rubric is applied to a small number of sample years, and the grade will be revised as more data accumulates.