Hattie Lake

Hattie Lake sits at the top of the Minnesota PCA grading rubric with an A, a mark reached by the cleanest lakes in Minnesota. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

The lake sits in the mesotrophic zone — the band where most well-managed Minnesota lakes fall. Hattie Lake reaches 39 ft at its deepest point — typical for Minnesota mid-sized lakes, with seasonal stratification but limited cold-water refuge. At 359 acres, Hattie Lake fits the Minnesota median for monitored lakes, with 4.7 miles of shoreline. Within Hubbard County's 77 graded lakes, Hattie Lake ranks 42 — below the local median, though not at the bottom.

Hattie 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 Hattie Lake, one of 15 fish species on record for the lake. A documented public access point at Hattie 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.