Little Horn Lake

On the LakeGrade rubric, Little Horn Lake pulls an A: clarity at 43.9 ft and 14 µg/L of phosphorus put it in the top bracket for Wisconsin. 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 Little Horn Lake in the oligotrophic range, where biological productivity stays low and the water column remains clear. Little Horn Lake reaches 25 ft at its deepest point — typical for Wisconsin mid-sized lakes, with seasonal stratification but limited cold-water refuge. Little Horn Lake is small — 25 acres alongside partial shoreline records — which makes it sensitive to even modest changes in watershed runoff or recreational pressure. Within Oconto County's 66 graded waters, Little Horn Lake sits at rank 13, near the top of the local distribution.

Little Horn Lake carries an invasive watermilfoil record — boat-launch decontamination and shoreline care matter more here than at uninfested lakes. The fishery is bass-led, with 3 documented species across the lake's records. 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.