Fish Lake

Fish Lake earns an A — water clarity, phosphorus, and chlorophyll-a all rate among the best monitored waters in Le Sueur County. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

A TSI near 44 places Fish Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. The lake's 55 ft maximum depth is in the upper tier for Minnesota — deep enough for cold-water fish to find refuge in summer. Fish Lake is small — 77 acres alongside 1.8 miles of shoreline — which makes it sensitive to even modest changes in watershed runoff or recreational pressure. Within Le Sueur County's 14 graded waters, Fish Lake sits at rank 1, near the top of the local distribution.

Fish Lake has no invasive species recorded in Minnesota state databases as of 2022, though prevention practices still apply at all access points. The fishery is bass-led, with 14 documented species across the lake's records. A documented public access point at Fish Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.