Ace Lake

The LakeGrade rubric puts Ace Lake at a C: clarity at 7.5 ft, phosphorus readings still being added, and a TSI of 48 signal an intermediate trophic state. 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 48 places Ace Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. Ace Lake is a shallow lake at 8 ft maximum depth, which means it warms quickly, mixes constantly, and amplifies nutrient inputs. The lake's 318 acres and 5.5 miles of shoreline put it in the mid-range bucket — large enough for varied use, small enough that watershed inputs reach the whole basin. Ace Lake sits at rank 121 of 187 in St. Louis County, in the lower half of the local distribution.

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