Thirty-One

A survey of water quality was conducted on 3/5/2026 to gauge the likelihood of a winterkill occurring on Thirty-One Lake. Winter dissolved oxygen levels were likely tolerable based on this survey with 6.6 ppm below the ice, 1.4 ppm at 12 feet, and 0.8 ppm near the bottom. Therefore, it seems unlikely for any significant winterkill to occur in spring 2026.

Minnesota DNR records list Walleye for Thirty-One, but none have a fishing-quality score yet — they may be recently stocked or have limited survey data. See the species list above.

We don't have a confirmed public access point on record for Thirty-One. Check the DNR LakeFinder page for current access details before you go.

No invasive species are on record for Thirty-One in Minnesota DNR data. Always clean, drain, and dry your equipment to help keep it that way.

No — Thirty-One has no lake-specific regulations in the 2026 Minnesota DNR regulations, so statewide Minnesota limits apply. The statewide walleye and sauger limit is: 6 combined, not more than one walleye over 20". Verify current rules with the Minnesota DNR before keeping fish.