Lone Lake

Lone Lake earns an A — water clarity, phosphorus, and chlorophyll-a all rate among the best monitored waters in Aitkin County. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

A TSI value of 32 puts Lone Lake in the oligotrophic range, where biological productivity stays low and the water column remains clear. At 60 ft of maximum depth, Lone Lake stratifies reliably through the summer — the hypolimnion stays cooler and clearer than the surface layer suggests. Lone Lake covers 433 acres alongside 5.6 miles of shoreline — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Lone Lake ranks 4 of 53 in Aitkin County, putting it in the upper tier of locally monitored lakes.

No invasive species are currently listed at Lone Lake — the lake remains off the Minnesota infested-waters roster. Walleye are documented at Lone Lake, one of 14 fish species on record for the lake. Public access is available — the lake is on the Minnesota PCA public-access list. The lake has a long ice-out record — 45 observations on file, with a median ice-out around Apr 18. 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.