Counties Impacted
Route Impacted
Work Type
Bridge Rehabilitation
In Progress


The Missouri Department of Transportation, along with consultants from Burns and McDonnell are designing a project to rehabilitate both the north and southbound Buchanan County Interstate 229 bridges at 6th and Atchison streets. The bridges, built in 1979, are in poor condition and in need of updates and repairs which include the bridge deck, superstructure and railings. 

Project Timeline

Planning and Design Phase

MoDOT, and consultants from Burns and McDonald, are working to design a bridge rehabilitation project of the north and southbound I-229 bridges at 6th and Atchison streets in St. Joseph.  

Contract Letting, Award & Notice to Proceed

This project was included in MoDOT's December 2022 letting, when contractors submit competitive bids on the project. The Missouri Highways and Transportation Commission awarded the project to Comanche Construction, Inc. 


The Notice to Proceed date, the earliest the contractor may begin work, will be March 2023.


When the contract is awarded, the contractor will work with MoDOT to determine the exact construction schedule. 


Closure Information: 

By contract, the contractor will have a total of 180 working days to complete the project. This includes a 55-day full closure of the southbound bridge and a separate 45-day full closure of the northbound bridge. Other stages of construction will take place under single-lane closures, with the exception of intermittent closures of 6th Street. 

The exact date of the road closures and the planned reopening will be established after the contract is awarded. This project is expected to begin in 2023 and could extend two construction seasons into 2024.



Project News:

Frequently Asked Questions: 

Q: Why are you closing I-229? 

A: The project team evaluated various options with the goal to limit the overall impact to motorists.

A full closure during the bridge deck and superstructure rehabilitation portions of the project is necessary, as it requires work across both lanes of traffic. By completing this portion of construction under a full closure, crews will be able to work more efficiently reducing the overall project construction time and impact to motorists. 


Q: What is the current proposed detour? 

A: Motorists will be directed along signed detours utilizing I-29 and U.S. Route 36 during the closure of each north and southbound bridge. 


Click the link to the right to view the detour plans. In these plans, Phase 1 notates when the southbound bridge will be closed and Phase 2 notates when the northbound bridge will be closed. 


Q: Who can I contact if I have further questions? 

A: Please call 888 ASK MODOT (888-275-6636) and ask to speak with Project Manager Richard Orr in the Northwest District.


Q: How can I stay updated on the project's progress? 

A: Keep visiting this page and our Traveler Information Map at: for updates. 



Buchanan County I-229 Bridges at 6th Street

Need more information?

We're here to help. If you need additional information regarding this, or other Northwest District projects contact our communications team at: