Swamp Lake

On the LakeGrade rubric, Swamp Lake pulls an A: clarity at 16.2 ft and phosphorus readings still being added put it in the top bracket for Minnesota. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

A TSI value of 37 puts Swamp Lake in the oligotrophic range, where biological productivity stays low and the water column remains clear. At 50 ft of maximum depth, Swamp Lake stratifies reliably through the summer — the hypolimnion stays cooler and clearer than the surface layer suggests. Swamp Lake covers 109 acres alongside 3.9 miles of shoreline — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Swamp Lake ranks 3 of 6 in Unknown County — solidly in the upper half of the local distribution.

Swamp Lake has no invasive species recorded in Minnesota state databases as of 2022, though prevention practices still apply at all access points. The state fisheries records do not list documented species for Swamp Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. The lake lacks a documented public access point, so visitor use is limited. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.