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Board approves DOT agreement for I‑380 bridge joint repairs; county to handle surface debris and snow removal
Summary
The board approved DOT agreement 2025‑CD‑008 for deck joint repair on the I‑380 overpass at 50 Fourth Street; DOT will fund and perform the repair and may close the bridge for several weeks, while the county will be responsible for debris and snow clearing on local road surfaces affected by detours.
The Benton County Board of Supervisors approved a preconstruction agreement with the Iowa Department of Transportation for deck joint repair on the I‑380 overpass at the 50 Fourth Street interchange.
The county engineer reported the DOT plans could require a full closure of the bridge deck while maintaining the on‑ and off‑ramps; detours would use the nearest north and south interchanges. The engineer said the DOT expects to cover construction costs and design work, while the county will be responsible for clearing debris and providing snow removal on county roads that are used as detour routes. The engineer estimated a possible project duration measured in weeks (five to seven weeks was cited as an example), though the DOT’s timeline could vary.
Board action: A supervisor moved to approve DOT Agreement 2025‑CD‑008 for deck joint repair of the I‑380 overpass at 50 Fourth Street; the motion passed by voice vote.
Why it matters: The project could temporarily limit direct east‑west travel across that overpass; local roads used as detours could experience added traffic and require additional county maintenance. County staff asked the DOT to participate in maintenance costs if detour traffic increases wear on county roads, and the engineer said the DOT has participated in similar arrangements in past projects.
Next steps: The board chair and auditor will sign the DOT preconstruction agreement; county staff will monitor DOT scheduling, coordinate detour communications and confirm any cost‑sharing arrangements if detour traffic necessitates additional county maintenance.
