Iowa Code § 589.30
Effective January 1, 1993, the establishment of a county road pursuant to proceedings by a board of supervisors, in which the proceedings, plans, or plats were on file or recorded with the county auditor or county recorder prior to January 1, 1920, are not ineffectual because of the failure of the board of supervisors to comply with any of the steps necessary for the establishment of the road, and these proceedings are legalized and valid as if the record showed that the law had been complied with, unless the adjacent property owner, or an attorney, agent, guardian, conservator, trustee, or parent of a minor adjacent property owner, files in the office of the county recorder in the county where the property is located, a statement in writing, which is duly acknowledged, and which specifically describes the property involved, the nature and extent of the right of the interest claimed, and the nature of the alleged failure to comply with any of the steps necessary for the establishment of the road, on or before December 31, 1992.
Iowa Code § 589.30
92 Acts, ch 1169, §1