SIOUX CITY, Iowa – December 9, 2025 – If you drive on the Iowa 175 bridge over I-29 west of Onawa at I-29 Exit 112 you need to be aware of an upcoming closure that may affect your trip, according to the Iowa Department of Transportation’s Sioux City construction office.
On Friday, December 12, weather permitting, crews will be closing the Iowa 175 bridge from approximately 9:00 a.m. to 3:00 p.m. so traffic control can be updated on the structure. There have been multiple hits to the structure with the last hit occurring on November 13, 2025. The bridge will remain one lane until a maintenance project can be completed in the spring of 2026.
Portable message signs will guide traffic while the Iowa 175 bridge is closed.
The Iowa DOT reminds motorists to drive with caution, obey the posted speed limit and other signs in the work area, and be aware that traffic fines for moving violations are at least double in work zones. As in all work zones, drivers should stay alert, allow ample space between vehicles, and wear seat belts.
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For general information about this closure, please contact Sarah Tracy, District 3 transportation planner, at 712-274-5831 or sarah.tracy@iowadot.us.