MASON CITY, Iowa – Aug. 27, 2025 – The Iowa 122 reconstruction project between Pierce Avenue and Monroe Avenue in Mason City will be entering a new stage on Wednesday, Sept. 3, weather permitting, according to the Iowa Department of Transportation’s Mason City construction office.
This means the Iowa 122/Pierce Avenue intersection will be closed to all turning traffic except for northbound drivers wanting to turn east. Eastbound traffic attempting to access the hospital will be most impacted with this closure. Access to the hospital for eastbound traffic will now be gained via a detour that will begin at Winnebago Way and continue east on 1st Street NW. Traffic will then turn south on Taylor Avenue and continue to 3rd Street SW to access hospital and clinic parking. Westbound traffic will still have access to the hospital from Crescent Avenue.
This stage of construction will also require closing the east intersection of Willowbrook Drive and Iowa 122 to allow lane transitions for Iowa 122 through traffic. Iowa 122 through traffic will remain as it has been for most of the summer, with no left turns between Pierce and Monroe Avenues.
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 project, contact Jason Ruter, Iowa DOT Mason City construction office, at 641-430-2367 or jason.ruter@iowadot.us.
428 43rd St. SW
Mason City, IA 50401