Elm Island Lake

Elm Island Lake earns a D — measurements through 2024 show persistent nutrient pressure that limits clarity through the summer. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

Eutrophic conditions are the baseline here: clarity drops noticeably in late summer, and dissolved oxygen near the bottom can become a concern. Elm Island Lake reaches 25 ft at its deepest point — typical for Minnesota mid-sized lakes, with seasonal stratification but limited cold-water refuge. The lake's 520 acres and 7.9 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 53 graded lakes of Aitkin County, Elm Island Lake sits at rank 47, near the bottom of the county list.

Elm Island 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 Elm Island Lake, one of 15 fish species on record for the lake. A documented public access point at Elm Island Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. Ice-out has been recorded 16 times at Elm Island Lake, with a median around Apr 18. 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.