Minnesota · ranked from DNR surveys
Best largemouth bass lakes in Mahnomen County
The DNR has surveyed largemouth bass in 12 lakes in Mahnomen County. The 7 ranked below are the ones that earn a grade on this site. Grades come from survey catch rates, fish size and trophy history, scored the same way for every lake on the live map.
Roy Lake is first at A−. The DNR caught 53.7 largemouth bass per hour of electrofishing in the 2023 survey, and the biggest was 17 inches. South Twin Lake is second at A−, with 46.6 largemouth bass per hour of electrofishing in the 2024 survey, and 10% of its largemouth bass measured over 15 inches. North Twin Lake is third at B+, and its biggest largemouth bass was 19 inches.
| # | Lake | Grade | Acres | Survey catch rate | Over 15" | Biggest Surveyed | Avg wt | Surveyed |
|---|---|---|---|---|---|---|---|---|
| 1 | Roy Lake | A− | 695 | 53.7/hr in electrofishing | 30% | 17" | 1.3 lb | 2023 |
| 2 | South Twin Lake | A− | 1,127 | 46.6/hr in electrofishing | 10% | 18" | 0.9 lb | 2024 |
| 3 | North Twin Lake | B+ | 966 | 27.3/hr in electrofishing | 15% | 19" | 1 lb | 2024 |
| 4 | Little Vanose Lake | C+ | 143 | — | 0% | 11" | 0.8 lb | 2017 |
| 5 | Island Lake | C+ | 616 | 14.4/hr in electrofishing | 50% | 18" | 2 lb | 2025 |
| 6 | Tulaby Lake | C | 832 | 10.1/hr in electrofishing | 19% | 19" | 1 lb | 2025 |
| 7 | Snider Lake | C− | 634 | 9.9/hr in electrofishing | 25% | 17" | 1 lb | 2023 |
Also ranked in Mahnomen County: Walleye · Northern pike · Crappie · Bluegill · Yellow perch
All of Minnesota: Best largemouth bass lakes in Minnesota
Grades are based on Minnesota DNR survey data: how many fish the DNR caught (scaled by lake size), how many reached quality size, and the biggest fish measured. Each lake's page has the numbers behind its grade. The table shows each lake's most recent survey year.