Green Prairie Fish Lake

Green Prairie Fish Lake sits at a C on the grading scale — not impaired, not pristine, with summer measurements that vary year to year. 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.

A TSI near 47 places Green Prairie Fish Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. A maximum depth of 22 ft puts Green Prairie Fish Lake in the middle of Minnesota's depth distribution. The lake's 182 acres and 2.5 miles of shoreline put it in the mid-range bucket — large enough for varied use, small enough that watershed inputs reach the whole basin. Within Morrison County's 16 graded lakes, Green Prairie Fish Lake ranks 12 — below the local median, though not at the bottom.

Green Prairie Fish Lake has no invasive species recorded in Minnesota state databases as of 2024, though prevention practices still apply at all access points. Walleye are documented at Green Prairie Fish Lake, one of 14 fish species on record for the lake. A documented public access point at Green Prairie Fish Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. Ice-out has been recorded 10 times at Green Prairie Fish Lake, with a median around Apr 16. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.