Turtle Lake

Turtle Lake carries a solid B grade — strong on most parameters, with measurements that hold up well across the summer season. Clarity is the limiting factor — phosphorus is reasonable but suspended particles or algal cells keep water transparency below Minnesota norms.

A TSI near 43 places Turtle Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. The lake bottoms out at 45 ft — a moderate depth that supports a warm-water fishery without the year-round cold refuge a deeper basin provides. Turtle Lake covers 1,607 acres alongside 11.4 miles of shoreline, large enough that conditions can vary meaningfully between bays. Within Beltrami County's 86 graded lakes, Turtle Lake ranks 51 — below the local median, though not at the bottom.

Turtle Lake is on the watch list for starry stonewort, an invasive macroalga that is difficult to control once established. Walleye are documented at Turtle Lake, one of 16 fish species on record for the lake. A documented public access point at Turtle Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. Ice-out has been logged at Turtle Lake more than two dozen times, putting the median around Apr 23 — 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.