Iowa Code § 306.27: Changes for safety, economy, and utility.

The state department of transportation as to primary roads and the boards of supervisors as to secondary roads on their own motion may change the course of any part of any road or stream, watercourse, or dry run and may pond water in order to avoid the construction and maintenance of bridges, or to avoid grades, or railroad crossings, or to straighten a road, or to cut off dangerous corners, turns, or intersections on the highway, or to widen a road above statutory width, or for the purpose of preventing the encroachment of a stream, watercourse, or dry run upon the highway. The department and the board of supervisors shall conduct their proceedings in the manner and form prescribed in chapter 6B, except that the board of supervisors may use the form prescribed in sections 306.28 through 306.37 for the condemnation of right-of-way that is contiguous to existing road right-of-way and necessary for the maintenance, safety improvement, or upgrade of the existing secondary road. Changes are subject to chapter 455B and chapter 459, subchapters II and III.