Fremont Lake

On the scoring rubric Fremont Lake grades a D: clarity at 3.0 ft and 64 µg/L of phosphorus keep it in the lower bracket for Sherburne County. 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 63, Fremont Lake reads as eutrophic — nutrient-rich enough that summer algal growth and reduced clarity are expected, not unusual. Fremont Lake is a shallow lake at 8 ft maximum depth, which means it warms quickly, mixes constantly, and amplifies nutrient inputs. Fremont Lake covers 493 acres alongside 5.3 miles of shoreline — a mid-sized water that supports a working fishery without being so large that conditions diverge between basins. Fremont Lake sits at rank 17 of 24 in Sherburne County, in the lower half of the local distribution.

Fremont 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 Fremont Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. Public access is available — the lake is on the Minnesota PCA public-access list. Ice-out has been recorded 13 times at Fremont Lake, with a median around Apr 2. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.