From the Minnesota DNR website, Lakefinder:
Fishing Regulations:
General »
Inland Waters »
Special Fishing Regulations: This lake has special fishing regulations that differ from statewide or border water regulations for those species identified below and take precedence. Regulations listed below are currently in place. Vist the fishing regulations page for links to upcoming regulations for specific lakes.
Including Sullivan Bay and Ash River to Ash River Falls
Walleye and Sauger: Combined possession limit six, only four may be walleye. All walleye from 18-26″ must be immediately released. One over 26″ allowed in possession.