Mayo Lake

The LakeGrade rubric puts Mayo Lake at a C: clarity at 4.8 ft, 30 µg/L of phosphorus, and a TSI of 54 signal an intermediate trophic state. The lake's weakest score is on Secchi depth — the water looks more turbid than its phosphorus number alone would predict.

Eutrophic conditions are the baseline here: clarity drops noticeably in late summer, and dissolved oxygen near the bottom can become a concern. A maximum depth of 22 ft puts Mayo Lake in the middle of Minnesota's depth distribution. The lake's 164 acres and 3.5 miles of shoreline put it in the mid-range bucket — large enough for varied use, small enough that watershed inputs reach the whole basin. Within the 120 graded lakes of Crow Wing County, Mayo Lake sits at rank 110, near the bottom of the county list.

Mayo Lake has no invasive species recorded in Minnesota state databases as of 2024, though prevention practices still apply at all access points. The fishery is bass-led, with 12 documented species across the lake's records. No formal public access is documented at Mayo Lake — most use is by shoreline residents and their guests. 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.