Graham Lake

Graham Lake carries a solid B grade — strong on most parameters, with measurements that hold up well across the summer season. With clarity and phosphorus scored, the sub-grades cluster within a letter of each other, pointing to stable conditions rather than one specific stressor.

The lake sits in the mesotrophic zone — the band where most well-managed Minnesota lakes fall. Graham Lake reaches 34 ft at its deepest point — typical for Minnesota mid-sized lakes, with seasonal stratification but limited cold-water refuge. At 217 acres, Graham Lake fits the Minnesota median for monitored lakes, with 2.9 miles of shoreline. Graham Lake ranks 77 of 97 in Otter Tail County — at the lower end of the locally monitored distribution.

Graham Lake has no invasive species recorded in Minnesota state databases as of 2023, though prevention practices still apply at all access points. Walleye are documented at Graham Lake, one of 16 fish species on record for the lake. The lake lacks a documented public access point, so visitor use is limited. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.