Wis. Stat. § 82.29

Any part of a highway lying wholly within state park lands may be discontinued or relocated by the state agency having jurisdiction over the state park by filing written notice of the discontinuance or relocation with the clerk of the municipality that has jurisdiction over the highway and upon approval by the municipality after holding a hearing as provided in s. 82.10. No discontinuance or relocation under this section may deprive a landowner of all highway access. This section does not apply to state trunk highways or connecting highways.