Turtle Lake

Turtle Lake carries a solid B grade — strong on most parameters, with measurements that hold up well across the summer season.

The lake sits in the mesotrophic zone — the band where most well-managed Minnesota lakes fall. Turtle Lake reaches 21 ft at its deepest point — typical for Minnesota mid-sized lakes, with seasonal stratification but limited cold-water refuge. The lake's 218 acres and 3.1 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, Turtle Lake ranks 26 — below the local median, though not at the bottom.

Zebra mussel presence at Turtle Lake means the lake's clarity numbers carry an asterisk — filtered water is not the same as nutrient-poor water. The fishery includes walleye among the lake's 12 documented species — a notable draw for Minnesota anglers. Public access is available — the lake is on the Minnesota PCA public-access list. 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.