16th Street and 17th Street intersections at U.S. 65/South Federal Avenue in Mason City will be closed to traffic starting on Monday, Aug. 11

MASON CITY, Iowa – Aug. 5, 2025 – The 16th Street and 17th Street intersections with U.S. 65/South Federal Avenue in Mason City will be closed to traffic beginning on Monday, Aug.11, weather permitting, according to the Iowa Department of Transportation’s Mason City construction office. This will mark the start of the final phase of the U.S. 65 reconstruction project in Mason City for 2025.

Currently, U.S. 65/South Federal Avenue is closed between 10th Street and 16th Street with the 16th Street intersection remaining open. On Monday, Aug. 11, that will change as the 16th Street and 17th Street intersections will close. Access to businesses in the old Sears/Target/Southport shopping area will be from 15th Street SW. 

US 65 detour map for closure in Mason City.

U.S. 65/South Federal Avenue in Mason City is currently closed to through traffic between 6th Street and 19th Street. The roadway between 6th and 10th streets has been opened to local traffic and other sections will open in the coming weeks as the reconstruction continues. The Iowa DOT appreciates your patience and understanding as crews continue to finish work in these locations to prepare the roadway for traffic. 

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.

The latest traveler information is available anytime 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 project, contact Jason Ruter, Iowa DOT Mason City construction office, at 641-430-2367 or jason.ruter@iowadot.us.