The Iowa Department of Transportation is seeking public comments on a proposed bridge replacement project along Iowa 146 that will require acquiring a quarter-acre of land from Robertson’s Access, a 42-acre public recreation area featuring a primitive campground in southern Poweshiek County. The project, which involves replacing the existing bridge spanning the North Skunk River, carries an April 6 public comment deadline for stakeholders wishing to weigh in on the proposal.
The Iowa DOT plans to acquire approximately 0.25 acres of permanent right-of-way from Robertson’s Access to accommodate the new bridge structure. The area slated for acquisition consists of forested green space, and construction may require clearing a few trees. Additional impacts will include grading and ditching along the Iowa 146 corridor, though the department has stated no other amenities at the recreation area will be affected by the work.
Robertson’s Access encompasses 42 acres split between two county conservation boards with distinct management responsibilities. The southern 35 acres fall under the oversight of the Mahaska County Conservation Board and feature a primitive campground, nature trail, restrooms, picnic tables, and direct river access to the North Skunk River. These amenities make the property a destination for outdoor recreation enthusiasts seeking rustic camping experiences along the waterway.
The northern 8 acres of the property are managed by the Poweshiek County Conservation Board and consist primarily of river bottom timber. This section lacks recreational amenities or designated access points from either Iowa 146 or 540th Avenue, representing undeveloped natural space within the larger recreation area footprint.
Robertson’s Access carries classification as a Section 4(f) resource under the U.S. Department of Transportation Act of 1966, which was enacted to protect publicly owned parks, recreation areas, wildlife and waterfowl refuges, and historic sites of local, state, or national significance from conversion to transportation uses. This federal protection requires the Iowa DOT to carefully evaluate project impacts on the recreation area before proceeding.
The Iowa DOT has determined that the bridge replacement will have a de minimis impact on the property. Under federal guidelines, de minimis impacts are defined as those that, after consideration of measures to minimize harm such as avoidance, minimization, mitigation, or enhancement measures, do not adversely affect the activities, features, and attributes of the Section 4(f) resource. This determination allows the project to move forward while acknowledging the property’s protected status.
Section 4(f) protections apply to publicly owned parks, recreation areas, and similar resources across the country. Protected status typically ensures long-term preservation of natural features at public recreation sites, including river access, trail systems, and forested landscapes. The de minimis impact standard provides a framework for transportation projects to proceed when impacts to protected resources are minimal.
The split-management structure at Robertson’s Access, with its developed southern acreage under Mahaska County Conservation Board oversight and undeveloped northern acreage managed by Poweshiek County Conservation Board, illustrates the varied management approaches found across public recreation lands in Iowa.
The land acquisition from Robertson’s Access represents one component of the broader Iowa 146 bridge replacement project. The Iowa DOT has not released detailed design specifications or a construction timeline in the current project announcement.
The primitive campground managed by Mahaska County Conservation Board and other recreational amenities at Robertson’s Access will remain accessible, according to the department’s project documentation. Only the 0.25-acre acquisition area consisting of forested green space will be permanently converted to transportation use.
Stakeholders with questions or comments about the proposed bridge replacement project can submit feedback through the public comment process. The comment period remains open until April 6 for those seeking to provide input on the proposal and its impacts to Robertson’s Access.
The Iowa DOT’s project announcement invites public participation as part of the agency’s standard review process for transportation improvements affecting protected recreation resources.