Southbridge Interchange improvement project advances

The Iowa Department of Transportation notified Woodbury County that the Interchange Justification Report for a new Interstate 29 interchange south of the airport has been approved by the Federal Highway Administration.   The county is now working with the Iowa DOT to design the new interchange.   The project is listed in the five year construction program for both the Iowa DOT and the county.

This project has locally been known as the Southbridge Interchange and has been a priority project in the Siouxland Interstate Metropolitan Planning Council (SIMPCO) since 2005.   The preliminary design is for a diamond interchange with an overpass above the I-29 lanes.    Roads connecting the interchange and overpass to Port Neal Road and Old Highway 75 will be constructed as part of the project.     Survey and design work will begin later this year.  Construction is tentatively scheduled for Fiscal Year 2026.

New information will be posted on the county website as it becomes available.   Questions can be directed to the Woodbury County Engineers Office at 712-873-3215 or 712-279-6484 (for Sioux City phones).