Trout Lake

On the LakeGrade rubric, Trout Lake pulls an A: clarity at 18.0 ft and 4 µg/L of phosphorus put it in the top bracket for Minnesota. 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 value of 29 puts Trout Lake in the oligotrophic range, where biological productivity stays low and the water column remains clear. Trout Lake is unusually deep for Minnesota at 157 ft, which buffers the lake against summer warming and helps the deep water stay oxygenated. At 1,743 acres, Trout Lake is one of the larger lakes in Itasca County, with 13.3 miles of shoreline supporting multiple distinct use patterns. Trout Lake ranks 7 of 141 in Itasca County, putting it in the upper tier of locally monitored lakes.

No invasive species are currently listed at Trout Lake — the lake remains off the Minnesota infested-waters roster. Walleye are documented at Trout Lake, one of 9 fish species on record for the lake. The lake lacks a documented public access point, so visitor use is limited. Ice-out has been logged at Trout Lake more than two dozen times, putting the median around Apr 26 — a useful baseline for tracking climate trends. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.