Northbound Interstate 15 traffic between the Northgate and Fort Hall interchanges (Exits 73 and 80) will shift into newly constructed lanes beginning Wednesday night, November 12. This change allows construction crews to start work on the east side of I-15 as part of a major widening project.
Motorists traveling through the area should expect temporary closures and reduced speeds. The project aims to expand the interstate to three lanes in each direction, with completion anticipated in 2027.
Key Takeaways
- Northbound I-15 traffic shifts to new median lanes on November 12.
- The Northgate Interchange (Exit 173) on-ramp will close temporarily Wednesday night.
- Reduced speeds and concrete barriers will be present in the work zone.
- The overall project will widen I-15 to three lanes in each direction.
- Construction is expected to finish in 2027.
Upcoming Traffic Changes and Impact
The Idaho Transportation Department (ITD) is implementing a significant traffic pattern change on Interstate 15. The northbound lanes will move into a newly built section in the median. This shift is critical for advancing the widening project.
During the transition on Wednesday night, November 12, the northbound on-ramp at the Northgate Interchange (Exit 173) will close for several hours. Drivers should plan for potential delays and consider alternative routes if traveling during this period.
Project at a Glance
- Location: I-15 between Northgate (Exit 73) and Fort Hall (Exit 80) interchanges.
- Funding: Governor Little’s Leading Idaho initiative.
- Goal: Three lanes in each direction on I-15.
- Estimated Completion: 2027.
What Drivers Can Expect Post-Shift
After the traffic shift is complete, two lanes will remain open in each direction on I-15 during daytime hours. A concrete barrier will separate opposing lanes of traffic, enhancing safety in the construction zone. Drivers are urged to observe reduced speed limits within the work area.
This phase of construction focuses on the east side of I-15. Once these new northbound lanes are fully completed, expected in late 2026, crews will then shift their attention to the southbound lanes on the west side of the interstate.
"The safety of motorists and construction crews is ITD’s top priority during construction. When driving through the work zone, please stay alert, follow work zone signage and drive the posted speed limit."
Project Details and Long-Term Goals
The I-15 Northgate to Fort Hall widening project is a major infrastructure undertaking. It is funded by Governor Little’s Leading Idaho initiative. The ultimate goal is to create three lanes in each direction, significantly improving traffic flow and capacity on this vital corridor.
The entire project is anticipated to conclude in 2027. This long-term investment aims to accommodate future traffic growth and enhance regional connectivity.
Why This Project Matters
Widening I-15 is crucial for supporting economic growth and improving travel reliability in the region. Increased lane capacity helps reduce congestion, especially during peak travel times, making daily commutes and long-distance journeys smoother for thousands of drivers.
Staying Informed on Travel Conditions
The Idaho Transportation Department advises motorists to plan for extra travel time when passing through the construction area. Up-to-date information on restrictions and potential delays is available through several channels.
Drivers can visit 511.idaho.gov or use the 511 mobile app for the latest updates. Additionally, those interested in receiving direct email or text notifications about the project can sign up by visiting itdprojects.idaho.gov/pages/i15northgatetoblackfoot or calling (208) 252-5553.
Adhering to posted speed limits and remaining vigilant in work zones is essential for everyone's safety. Construction zones present unique challenges, and driver awareness plays a critical role in preventing accidents.
- Check 511.idaho.gov for real-time updates.
- Download the 511 mobile app for on-the-go information.
- Sign up for email or text alerts for direct notifications.
- Always follow work zone signage and posted speed limits.
