Aaron Lake

Aaron Lake sits at a C on the grading scale — not impaired, not pristine, with summer measurements that vary year to year. Sub-grades cluster within a single letter of each other, which usually means the lake is in stable trophic balance rather than fighting one specific stressor.

A TSI near 49 places Aaron Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. Aaron Lake reaches 16 ft at its deepest point — typical for Minnesota mid-sized lakes, with seasonal stratification but limited cold-water refuge. The lake's 610 acres and 4.9 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 Douglas County's 51 graded lakes, Aaron Lake ranks 38 — below the local median, though not at the bottom.

Zebra mussels have been documented at Aaron Lake, which alters the filter-feeding balance and can paradoxically increase water clarity while disrupting the food web. Walleye are documented at Aaron Lake, one of 15 fish species on record for the lake. A documented public access point at Aaron Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. The lake has a partial ice record — 8 observed ice-outs, centered near Apr 25. 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.