Wis. Stat. § 88.13
Whenever necessary for any purpose connected with the organization of a district or the construction, maintenance or repair of drains and other works, members of the board, representatives of the department of agriculture, trade and consumer protection, and persons intending to bid on or to whom contracts have been let for the construction of the works within a district or on former district lands transferred under s. 88.83 and their respective agents and employees may go upon any lands proposed for inclusion or included within a district or on adjoining lands or on former district lands transferred under s. 88.83, and are not guilty of trespass therefor but are liable for unnecessary damage caused to crops or structures.
Wis. Stat. § 88.13