Minnesota · ranked from DNR surveys
Best walleye lakes in Mahnomen County
11 surveyed walleye lakes sit in Mahnomen County; the 8 ranked here cleared this site's grade rubric, which reads DNR survey catch rates, size structure and trophy history the same way the live map does for every lake.
Tulaby Lake leads at grade A, with 27.6 walleye per net in gill nets in its 2025 survey and a 28-inch fish the biggest measured. Little Vanose Lake is next at A−, 132 walleye per net in gill nets in its 2017 survey, 0% of the walleye netted over 20 inches. South Twin Lake rounds out the top three at B+, a 25-inch fish the biggest measured.
| # | Lake | Grade | Acres | Survey catch rate | Over 20" | Biggest Surveyed | Avg wt | Surveyed |
|---|---|---|---|---|---|---|---|---|
| 1 | Tulaby Lake | A | 832 | 27.6/net in gill nets | 12% | 28" | 1.2 lb | 2025 |
| 2 | Little Vanose Lake | A− | 143 | 132/net in gill nets | 0% | 14" | 0.4 lb | 2017 |
| 3 | South Twin Lake | B+ | 1,127 | 4.3/net in gill nets | 24% | 25" | 2 lb | 2024 |
| 4 | Roy Lake | B+ | 695 | 4.7/net in gill nets | 14% | 27" | 1.7 lb | 2023 |
| 5 | Island Lake | B+ | 616 | 3.8/net in gill nets | 47% | 27" | 2.8 lb | 2025 |
| 6 | Snider Lake | B | 634 | 3.2/net in gill nets | 20% | 30" | 2 lb | 2023 |
| 7 | Bass Lake | B− | 735 | 3.3/net in gill nets | 19% | 22" | 1.8 lb | 2022 |
| 8 | North Twin Lake | B− | 966 | 1.9/net in gill nets | 20% | 28" | 2.3 lb | 2024 |
Also ranked in Mahnomen County: Northern pike · Largemouth bass · Crappie · Bluegill · Yellow perch
All of Minnesota: Best walleye lakes in Minnesota
Grades are this site's rubric over Minnesota DNR survey data (catch per unit effort against DNR benchmarks, size structure, trophy history). See any lake's page for the underlying numbers. Survey years vary by lake; the table shows each lake's latest.