Nibin Lake

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

At a TSI of 52, Nibin Lake reads as eutrophic — nutrient-rich enough that summer algal growth and reduced clarity are expected, not unusual. A maximum depth of 40 ft puts Nibin Lake in the middle of Minnesota's depth distribution. At 776 acres, Nibin Lake fits the Minnesota median for monitored lakes, with 11.3 miles of shoreline. Nibin Lake ranks 175 of 187 in St. Louis County — at the lower end of the locally monitored distribution.

No invasive species are currently listed at Nibin Lake — the lake remains off the Minnesota infested-waters roster. The fishery includes walleye alongside the lake's other 5 documented species — a notable draw for Minnesota anglers. No formal public access is documented at Nibin Lake — most use is by shoreline residents and their guests. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.