Mosomo Lake

The LakeGrade rubric puts Mosomo Lake at a C: clarity at 4.5 ft, phosphorus readings still being added, and a TSI of 56 signal an intermediate trophic state. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

At a TSI of 56, Mosomo Lake reads as eutrophic — nutrient-rich enough that summer algal growth and reduced clarity are expected, not unusual. Mosomo Lake reaches 30 ft at its deepest point — typical for Minnesota mid-sized lakes, with seasonal stratification but limited cold-water refuge. The lake is compact at 48 acres, with 1.1 miles of shoreline and little volume to buffer nutrient inputs. Within the 141 graded lakes of Itasca County, Mosomo Lake sits at rank 123, near the bottom of the county list.

No invasive species are currently listed at Mosomo Lake — the lake remains off the Minnesota infested-waters roster. The state fisheries records do not list documented species for Mosomo Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. Public access is available — the lake is on the Minnesota PCA public-access list. 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.