Wisconsin Statutes Public Lands, Waters and Natural Resources (Ch. 23 to 33) § 27.14. Police protection

(1) Every city may exercise police supervision over all parks, parkways, boulevards and pleasure drives managed and controlled by its common council or by its board of park commissioners.

(2) The board of park commissioners shall recommend to the common council the enactment of such ordinances as it deems necessary to protect and preserve the parks, parkways, boulevards and pleasure drives under its charge, or to secure the free and reasonable use and enjoyment thereof by the public; and the common council shall enact such proposed ordinances or such other ordinances as will be suitable for the purposes stated.

(3) The city attorney shall prosecute in a court or courts of competent jurisdiction all violations of said ordinances.

(4) Each member of a board of park commissioners and its superintendent are vested with the powers of police officers for the enforcement of all rules and regulations of the board and the ordinances aforesaid.