July 9, 2026
The Montana Department of Transportation (MDT) and Jeffery Contracting Inc. will be closing the Spring Creek Interchange (Exit 219) northbound off-ramp from Tuesday, July 14 to Thursday, July 16, weather and other factors permitting.
Crews will remove and replace the existing pavement on the ramp. During this work, MDT recommends using Exit 226 in Wolf Creek to access Recreation Road. The ramp will reopen to normal traffic after the work is complete.
The southbound Exit 219 on-ramp will remain open.
What to expect during construction:
- Traffic will be reduced to one lane in each direction.
- Both north and southbound traffic will travel on the same side of I-15.
- Crossover traffic patterns will be in place throughout construction.
- Speed limits will be reduced.
- A 12-foot width restriction is in place. Loads wider than 12 feet must be staged and escorted. (visit 511mt.net for the most up-to-date information).
Motorists traveling through the project area between 4 and 6 a.m. may encounter brief interstate closures if wide-load escorts are needed.
July 2, 2026
Over the past two months, the Montana Department of Transportation (MDT) and Jeffery Contracting Inc. have been removing degraded roadway and laying new gravel base material on the northbound lanes of Interstate 15 (I-15) between the Sieben Interchange (Exit 216) and the Lyon's Creek I-15 Eastbound Rest Area south of Wolf Creek.
Progress has been steady and MDT anticipates completion of the northbound lanes this fall.
In the near future, crews plan to temporarily close the Spring Creek Interchange (Exit 219) ramps for resurfacing work. MDT will notify the public prior to this closure. To receive notifications, sign up for email or text message updates. For email updates, contact
A 12-foot width restriction remains in place, and any loads wider than 12 feet need to be staged and escorted. Motorists traveling through the project area between 4 and 6 a.m. may encounter brief interstate closures if wide-load escorts are needed.
What to expect during construction:
- Traffic will be reduced to one lane in each direction.
- Both north and southbound traffic will travel on the same side of I-15.
- Crossover traffic patterns will be in place throughout construction.
- Speed limits will be reduced.
- A 12-foot width restriction will be in place (visit 511mt.net for the most up-to-date information).
Work will pause by noon on Thursday, July 2, with no work taking place July 3 to 5, in observance of the Independence Day holiday. Crews will resume work on Monday, July 6.
April 30, 2026
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.
What to expect during construction:
- Traffic will be reduced to one lane in each direction.
- Both north and southbound traffic will travel on the same side of I-15.
- Crossover traffic patterns will be in place throughout construction.
- Speed limits will be reduced.
- A 12-foot width restriction will be in place (visit 511mt.net for the most up-to-date information).
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.
April 16, 2026
The Montana Department of Transportation (MDT) and Jeffery Contracting LLC have begun work to rehabilitate approximately 4 miles of Interstate 15 (I-15) north of the Sieben Interchange (Exit 216). This project will significantly rehabilitate both the north and southbound lanes of I-15 over two construction seasons. In 2026, crews will be rehabilitating the northbound lanes of the project area.
Work on this project began this week (April 13), with crews beginning to build crossovers so that north and southbound traffic can travel on the southbound side of the interstate during construction this year. During this first week crews have been preparing the southbound side of the interstate for crossover traffic by paving in rumble strips, adding temporary guardrail, and removing existing road striping.
Next week, motorists will encounter lane closures on both north and southbound I-15 as crews continue preparing for crossover traffic by moving additional barrier rail, setting up the crossover locations, and painting temporary roadway markings.
Rehabilitation of the northbound lanes of I-15 is anticipated to take the entire 2026 construction season to complete, with crews planning to rehabilitate the southbound lanes in 2027.
What to expect during construction:
- Traffic will be reduced to one lane in each direction.
- Both north and southbound traffic will travel on the same side of I-15.
- Crossover traffic patterns will be in place throughout construction.
- Speed limits will be reduced.
- A 12-foot width restriction will be in place (visit 511mt.net for the most up-to-date information).