Wis. Stat. § 88.91: Penalty for placing obstruction in ditches.

(1) Except as authorized by s. 88.93, no person shall place any kind of obstruction to the free flow of water, including any soil willfully deposited, in any drainage ditch, constructed under any drainage law of this state or lawfully constructed by any other person, without first obtaining the written consent of the drainage board or other person or authority in charge of such ditch.

(2) Any person violating this section may be fined not more than $100 and in addition is liable to the drainage district and to all persons whose ditches or lands are injured by such obstruction for all damages caused by the obstruction.