Cattyman Lake

The LakeGrade rubric puts Cattyman Lake at a C: clarity at 7.0 ft, phosphorus readings still being added, and a TSI of 49 signal an intermediate trophic state.

A TSI near 49 places Cattyman Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. Cattyman Lake is a shallow lake at 9 ft maximum depth, which means it warms quickly, mixes constantly, and amplifies nutrient inputs. Cattyman Lake is small — 17 acres alongside 0.9 miles of shoreline — which makes it sensitive to even modest changes in watershed runoff or recreational pressure. Cattyman Lake sits at rank 103 of 142 in Lake County, in the lower half of the local distribution.

Cattyman Lake has no invasive species recorded in Minnesota state databases as of 2023, though prevention practices still apply at all access points. The state fisheries records do not list documented species for Cattyman Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. No formal public access is documented at Cattyman 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.