Ml-Nw Lake

Ml-Nw Lake comes in at a B on the grading rubric — a respectable showing for a Minnesota lake of its size and depth. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

The lake sits in the mesotrophic zone — the band where most well-managed Minnesota lakes fall. The lake bottoms out at 42 ft — a moderate depth that supports a warm-water fishery without the year-round cold refuge a deeper basin provides. At 128,250 acres, Ml-Nw Lake is one of the larger lakes in Aitkin County, with 105.5 miles of shoreline supporting multiple distinct use patterns. Within Aitkin County's 53 graded waters, Ml-Nw Lake sits at rank 10, near the top of the local distribution.

Ml-Nw 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. Ml-Nw Lake's fishery is anchored by muskellunge, with 21 documented species in total — a destination water for muskie anglers. Public access is available — the lake is on the Minnesota PCA public-access list. Ice-out has been logged at Ml-Nw Lake more than two dozen times, putting the median around Apr 25 — a useful baseline for tracking climate trends. Multiple sampling years from Minnesota PCA volunteers and partner agencies back the grade, so the letter should hold steady absent a major watershed shift.