Knife Lake

On the LakeGrade rubric, Knife Lake pulls an A: clarity at 20.0 ft and phosphorus readings still being added 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.

A TSI value of 34 puts Knife Lake in the oligotrophic range, where biological productivity stays low and the water column remains clear. The lake's maximum depth is not yet documented in state morphometric records — context for its physical structure remains limited. Knife Lake covers 105 acres alongside 2.5 miles of shoreline — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Within Lake County's 142 graded waters, Knife Lake sits at rank 6, near the top of the local distribution.

Knife Lake has no invasive species recorded in Minnesota state databases as of 2024, though prevention practices still apply at all access points. The state fisheries records do not list documented species for Knife Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. No formal public access is documented at Knife Lake — most use is by shoreline residents and their guests. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.