(Onawa, Iowa) Suppose you drive on the Iowa 175 bridge over Interstate 29 west of Onawa. In that case, 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.
Beginning on Thursday, July 24, weather permitting, crews will close the Iowa 175 bridge for emergency repairs due to multiple hits to the structure, which have occurred since April 2025. The anticipated end date for the work is August 5, 2025.
When the Iowa 175 bridge is closed, you will follow a marked detour route (see map) as follows:
- Eastbound Iowa 175: At Exit 112 (Onawa/Iowa 175), head south on I-29 towards Council Bluffs to Exit 105 (Blencoe/Monona County Road E-60) where you will head east on Monona County Road E-60 to the northbound I-29 ramp, and then head northbound on I-29 back to Exit 112.
- Westbound Iowa 175: At Exit 112 (Onawa/Iowa 175), head north on I-29 towards Sioux City to Exit 120 (Whiting/Monona County Road E-24) where you will head west on Monona County Road E-24 to the southbound I-29 exit, and then head south on I-29 back to Exit 112.
Additionally, the following should be noted:
- The work may involve lane closures on I-29, depending on the specific project.
- Once the bridge repairs are completed, the lane closure that has been in place on the bridge will be removed.
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 remain alert, allow ample space between vehicles, and wear their seatbelts.
The latest traveler information is available at any time through our 511 system. Visit 511ia.org; call 511 (within Iowa) or 800-288-1047 (nationwide); stay connected with 511 on Facebook or X (find links at https://iowadot.gov/travel-tools/iowa-511/511-social-media-sites); or download the free app to your mobile device.
It’s easy to subscribe to Your 511 and sign up to receive email/text alerts. Visit https://new.511ia.org/#login to sign up. For instructions and help with this feature, visit https://www.511ia.org/help/section/how-to-create-and-manage-a-511-account.html.
For general information about this closure, don’t hesitate to get in touch with Sarah Tracy, District 3 transportation planner, at 712-274-5831 or sarah.tracy@iowadot.us.
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