Sibley Lake

The LakeGrade rubric puts Sibley Lake at a C: clarity at 4.9 ft, 26 µg/L of phosphorus, and a TSI of 53 signal an intermediate trophic state. Secchi readings are the weakest of the three parameters, suggesting suspended sediment or algal biomass dominates the optical signal.

Eutrophic conditions are the baseline here: clarity drops noticeably in late summer, and dissolved oxygen near the bottom can become a concern. Sibley Lake reaches 40 ft at its deepest point — typical for Minnesota mid-sized lakes, with seasonal stratification but limited cold-water refuge. At 444 acres, Sibley Lake fits the Minnesota median for monitored lakes, with 9.1 miles of shoreline. Within the 120 graded lakes of Crow Wing County, Sibley Lake sits at rank 109, near the bottom of the county list.

Sibley 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 Sibley Lake, one of 16 fish species on record for the lake. A documented public access point at Sibley Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. The lake has a partial ice record — 10 observed ice-outs, centered near Apr 17. 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.