Damage to any county trunk or town highway or city or village street caused by reason of its use as a detour designated by the department or for hauling materials incident to the maintenance, repair or construction by the department of any state trunk highway or street over which a state trunk highway is routed, shall be repaired by the department. Such highway or street shall also be maintained by the department during such use. Subject to s. 86.255, the cost of such repairs and maintenance shall be paid from funds appropriated and available to the department for the maintenance and improvement of state trunk highways and connecting highways under s. 20.395(3).
Wis. Stat. § 84.20