Minn. Stat. § 86B.111
The commissioner may require that a permit is obtained for the placement of a structure or device determined by the commissioner to constitute a hazard to navigation.
Except as authorized by the commissioner, a person may not obstruct, remove, damage, or destroy a buoy or structure placed in the waters of this state in accordance with this chapter or by authority of the United States.
A person may not place buoys or other waterway markers unless the markers conform with the uniform marking system established by the commissioner.
The marking of certain hazards to navigation on, in, or adjacent to the waters of this state by a governmental agency does not incur a duty to mark all navigational hazards by the agency or another agency.
Minn. Stat. § 86B.111
1990 c 391 art 9 s 5