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.

Mesotrophic conditions dominate at Ace Lake: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. At only 8 ft deep, Ace Lake is shallow — wind keeps the water column mixed and sediment resuspension drives phosphorus levels harder to manage. At 318 acres, Ace Lake fits the Minnesota median for monitored lakes, with 5.5 miles of shoreline. Ace Lake sits at rank 120 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. The lake lacks a documented public access point, so visitor use is limited. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.