Jasper Lake

On the LakeGrade scale Jasper Lake grades a B, with clarity at 12.0 ft and phosphorus readings still being added placing it above the Minnesota median.

A TSI near 41 places Jasper Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. Jasper Lake is unusually deep for Minnesota at 125 ft, which buffers the lake against summer warming and helps the deep water stay oxygenated. At 246 acres, Jasper Lake fits the Minnesota median for monitored lakes, with 6.6 miles of shoreline. Jasper Lake ranks 51 of 128 in Cook County — solidly in the upper half of the local distribution.

Jasper Lake has no invasive species recorded in Minnesota state databases as of 2021, though prevention practices still apply at all access points. The state fisheries records do not list documented species for Jasper Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. The lake lacks a documented public access point, so visitor use is limited. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.