Ml-Thains Lake

On the LakeGrade rubric, Ml-Thains Lake pulls an A: clarity at 16.1 ft and 26 µg/L of phosphorus put it in the top bracket for Minnesota. Sub-grades cluster within a single letter of each other, which usually means the lake is in stable trophic balance rather than fighting one specific stressor.

The lake sits in the mesotrophic zone — the band where most well-managed Minnesota lakes fall. A maximum depth of 42 ft puts Ml-Thains Lake in the middle of Minnesota's depth distribution. With 128,250 acres of surface and 105.5 miles of shoreline, Ml-Thains Lake is a large water by Minnesota standards — recreational pressure is spread across a long shoreline. Ml-Thains Lake ranks 1 of 11 in Mille Lacs County, putting it in the upper tier of locally monitored lakes.

Ml-Thains 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 Ml-Thains Lake, alongside the lake's 21 other documented fish. A documented public access point at Ml-Thains Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. The lake has a long ice-out record — 105 observations on file, with a median ice-out around Apr 25. Multiple sampling years from Minnesota PCA volunteers and partner agencies back the grade, so the letter should hold steady absent a major watershed shift.