One Pine Lake

One Pine Lake pulls a D on the LakeGrade rubric — phosphorus loading and limited clarity hold it below the Minnesota average.

A TSI in the eutrophic range signals a lake doing what nutrient-loaded waters do — supporting an active algal community at the cost of clear water. One Pine Lake is a shallow lake at 13 ft maximum depth, which means it warms quickly, mixes constantly, and amplifies nutrient inputs. The lake's 354 acres and 4.6 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 187 graded lakes of St. Louis County, One Pine Lake sits at rank 157, near the bottom of the county list.

No invasive species are currently listed at One Pine Lake — the lake remains off the Minnesota infested-waters roster. The fishery includes walleye among the lake's 13 documented species — a notable draw for Minnesota anglers. Public access is available — the lake is on the Minnesota PCA public-access list. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.