Wall Lake

Wall Lake carries a solid B grade — strong on most parameters, with measurements that hold up well across the summer season. clarity and phosphorus rate similarly, so there is no obvious single lever to pull on watershed management.

The lake sits in the mesotrophic zone — the band where most well-managed Minnesota lakes fall. Wall Lake reaches 34 ft at its deepest point — typical for Minnesota mid-sized lakes, with seasonal stratification but limited cold-water refuge. The lake's 727 acres and 6.9 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 Otter Tail County's 97 graded lakes, Wall Lake ranks 71 — below the local median, though not at the bottom.

Zebra mussels have been documented at Wall Lake, which alters the filter-feeding balance and can paradoxically increase water clarity while disrupting the food web. Walleye are documented at Wall Lake, one of 19 fish species on record for the lake. A documented public access point at Wall Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. Ice-out has been recorded 13 times at Wall Lake, with a median around Apr 13. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.