Wisconsin Statutes Fences (Ch. 90) § 90.13. Partition fence on newly enclosed land

(1) When any previously unenclosed land is enclosed, the owner or occupant of the newly enclosed land shall pay for 50 percent of each partition fence standing upon the line between that owner's or occupant's land and the enclosure of any other owner or occupant, unless the line has been previously divided. If the line has been previously divided, the owner or occupant of the newly enclosed land shall pay the value of the fence on the part of the line previously assigned to that owner or occupant. In either case, the value of the fence at the time shall be ascertained on the application of either adjoining owner or occupant as provided in s. 90.11, if the parties do not agree.

(2) If the responsible owner or occupant fails to pay the value for 60 days after the value has been ascertained and demand made, the proprietor of the fence may recover the value with the fence viewers' fees and costs.