HELENA, Mont. – The Montana Department of Transportation (MDT) and Jeffery Contracting Inc. have completed construction on crossovers on Interstate 15 (I-15) north of the Sieben Interchange (Exit 216). Traffic is now crossed over with both north and southbound traffic traveling on the southbound side of the interstate.
Traffic is expected to remain in this configuration for a majority of the summer, returning to normal configuration in the fall. Motorists traveling through the work zone should expect one lane open in each direction with north and southbound traffic travelling on the same side of I-15 at reduced speeds.
Motorists attempting to travel through the project area between 4 and 6 a.m. may encounter brief interstate closures if wide-load escorts are needed. A 12-foot width restriction is in place on this project, and any loads wider than 12 feet need to be staged and escorted. To avoid delays, travel through the corridor prior to or after this timeframe.
“Wide-load escorting on this project is less consistent than on the I-15 Wolf Creek North and South project,” said Matt Widhalm, MDT Engineering Project Manager. “The escort times are generally shorter, and there is no guarantee that we will have wide loads to escort on any given day. However, if you must avoid delays, it is best to travel through the project area before 4 a.m. or after 6 a.m.”
In 2026, crews will be removing and replacing more than a foot of degraded roadway material on the northbound lanes of I-15. Resurfacing the southbound lanes is expected to take place in 2027.
Other planned improvements include adding concrete barrier delineation (high-visibility reflective strips) on inside curves, replacing right-of-way fencing and cattle guards as needed, resurfacing the Spring Creek Interchange (Exit 219) ramps, adding new pavement markings, applying a seal and cover (chip seal), and upgrading concrete barrier rails, metal guardrail, and signage. Additionally, MDT is rerouting drainage through a new storm drainpipe on the eastern side of Spring Creek Interchange (Exit 219).
The purpose of this project is to extend the service life of the roadway, improve the ride of the existing pavement, and enhance safety features. The project will also reduce issues that require regular and costly maintenance along this section of interstate.
Visit 511mt.net for the most up-to-date information about oversized load restrictions and road conditions across Montana.
For more information about this project, visit the project website at mdt.mt.gov/pubinvolve/i15sieben. If you have questions or would like to sign up for email updates, contact Tyler at Tyler@rbci.net or call 406-333-7215.
To sign up for text message updates, text SIEBEN to 866-434-0866 (toll free)*.
*Texting alerts are not managed by MDT and may have different privacy and security policies. For more information read the SimpleTexting Privacy Policy by visiting: simpletexting.com/privacy-policy.
MDT is a workforce of over 2,000 people across Montana determined to do all we can so that you arrive at your destination safely. Our mission is to build, operate, and maintain a safe and resilient transportation system. For more information, visit mdt.mt.gov.
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