Ottertrack Lake

Ottertrack Lake earns an A — water clarity, phosphorus, and chlorophyll-a all rate among the best monitored waters in Unknown County. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

A TSI value of 33 puts Ottertrack Lake in the oligotrophic range, where biological productivity stays low and the water column remains clear. At 116 ft of maximum depth, Ottertrack Lake stratifies reliably through the summer — the hypolimnion stays cooler and clearer than the surface layer suggests. Ottertrack Lake covers 1,134 acres alongside 38.9 miles of shoreline, large enough that conditions can vary meaningfully between bays. Ottertrack Lake ranks 2 of 6 in Unknown County — solidly in the upper half of the local distribution.

No invasive species are currently listed at Ottertrack Lake — the lake remains off the Minnesota infested-waters roster. The fishery includes walleye alongside the lake's other 9 documented species — a notable draw for Minnesota anglers. No formal public access is documented at Ottertrack Lake — most use is by shoreline residents and their guests. 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.