French Lake

On the LakeGrade rubric French Lake fails the cutoffs — a TSI of 72 and persistent algal pressure put it in the bottom tier. 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.

The hypereutrophic status — TSI 72 — reflects sustained heavy nutrient loading from the surrounding watershed and frequent algal pressure. The lake's 56 ft maximum depth is in the upper tier for Minnesota — deep enough for cold-water fish to find refuge in summer. At 876 acres, French Lake fits the Minnesota median for monitored lakes, with 4.8 miles of shoreline. Within the 17 graded lakes of Rice County, French Lake sits at rank 13, near the bottom of the county list.

Eurasian watermilfoil is established at French Lake, which can dampen recreational access and pressure the native plant community. French Lake's fishery is anchored by muskellunge, with 16 documented species in total — a destination water for muskie anglers. Public access is available — the lake is on the Minnesota PCA public-access list. Ice-out has been recorded 16 times at French Lake, with a median around Mar 31. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.