Minn. Stat. § 103G.601: ICE-CUTTING FENCES AND GUARDS.

Subdivision 1. Fence and guard requirement.

A person cutting ice in or on waters entirely or partly in the state to remove ice must surround the cuttings and openings with fences or guards sufficient to warn persons of the cutting before the cutting is started. The fence or guard must be maintained until the ice has formed in the openings to the thickness of at least six inches.

Subd. 2. Penalty.

A person who fails to comply with this section is guilty of a misdemeanor.