Project Overview

The Utah Department of Transportation (UDOT) plans to construct a 13-mile-long northbound climbing lane on I-15 from the Kanarraville rest stop to the South Cedar Interchange, milepost 43 to 56. The project will widen I-15 through this area from two to three northbound lanes. The project will also reconstruct the northbound side of the Hamilton Fort interchange with a roundabout constructed on the east side of I-15 at Exit 51.

Construction is expected to require two construction seasons, beginning is Spring 2025 and ending by December 2026. Construction schedules are subject to change due to weather conditions and material availability.

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Exit 51 Roundabout  

The images below show the concept design for the new roundabout that will be built off the northbound Hamilton Fort interchange. These images are only renderings and may be subject to change.  

Before

Aerial view of a highway interchange with multiple lanes of traffic, on- and off-ramps, and an overpass in a rural landscape. R4.18224

After

Aerial view of a rural highway interchange with a conceptual roundabout overlaid on the image, showing proposed lane configurations and connections to on- and off-ramps on the east side of a freeway overpass. R4.18224

Schedule

Work Hours: 6 a.m. - 5 p.m.

Work Days: Monday through Friday

There may be intermittent one-lane closures during nighttime work hours of 5 p.m.- 7 a.m.

live
live
Construction: Winter 2025/2026

Construction began in Spring 2025. 

Traffic is shifted on northbound I-15 during daytime work hours as crews build a third passing lane between mileposts 43 and 56. 

Earthwork is underway on the east side of I-15 near the Hamilton Fort Interchange to prepare for a new roundabout. 

Schedules are subject to change due to weather conditions and material availability.

planned
planned
Construction: Spring 2026 - Fall 2026

The bridge replacement at the northbound I-15 Hamilton Fort Interchange will begin in February 2026. 

Construction for a roundabout at Exit 51 will begin in spring 2026. 

Late Fall 2026 - Project Completion

complete
complete
Complete

Project design was completed in Winter 2024.

Contact Information

To contact the public information team with questions or concerns:

Hotline: 435-254-3305

Email: i15hamiltonfort@utah.gov

Stay Informed

To receive project updates, please contact the public information team at the email address above and enter "Project Updates" in the subject line.