South Farm Lake

On the scoring rubric South Farm Lake grades a D: clarity at 5.0 ft and phosphorus readings still being added keep it in the lower bracket for Lake County.

At a TSI of 54, South Farm Lake reads as eutrophic — nutrient-rich enough that summer algal growth and reduced clarity are expected, not unusual. South Farm Lake reaches 31 ft at its deepest point — typical for Minnesota mid-sized lakes, with seasonal stratification but limited cold-water refuge. The lake's 564 acres and 10.8 miles of shoreline put it in the mid-range bucket — large enough for varied use, small enough that watershed inputs reach the whole basin. South Farm Lake ranks 118 of 142 in Lake County — at the lower end of the locally monitored distribution.

South Farm Lake has no invasive species recorded in Minnesota state databases as of 2024, though prevention practices still apply at all access points. Walleye are documented at South Farm Lake, one of 11 fish species on record for the lake. The lake lacks a documented public access point, so visitor use is limited. 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.