I-15 CORE
Design Map
Current Progress
I-15 CORE Construction Is Now Complete
The Utah County I-15 Corridor Expansion (I-15 CORE) is now complete. Construction on the project was finished in an unprecedented 35 months, making it the fastest billion-dollar public highway project ever built in the United States.
I-15 CORE reconstructed 24 miles of freeway from Lehi to Spanish Fork. The project widened the freeway by two lanes in each direction; replaced the original asphalt with new 40-year concrete pavement; extended the Express Lane from Lehi Main Street to Spanish Fork; and rebuilt or replaced 63 bridges and 10 freeway interchanges.
During construction, the I-15 CORE project achieved several notable milestones:
- Moved the Sam White Bridge — the longest two-span bridge to be moved by self-propelled modular transporters (SPMTs) in the Western Hemisphere — into place over I-15 in one night
- Constructed a new continuous flow intersection (CFI) — the first of its kind in Utah County — at University Parkway and Sandhill Road to reduce congestion at one of the busiest intersections in the county
- Constructed a new diverging diamond interchange (DDI) at 500 East in American Fork — the third DDI completed in Utah County
- Completed more than 90 percent of I-15 closures and restrictions during overnight hours to reduce inconvenience to the public
- Implemented lane splits to keep existing travel lanes open as much as possible while paving continued in the middle of the freeway
- Installed advanced traffic management system (ATMS) devices including 93 sensors, 36 cameras, 22 ramp meters and four permanent variable message signs to help UDOT engineers monitor traffic, respond to incidents and ensure the transportation system functions as efficiently as possible to keep traffic moving
Click here for more I-15 CORE facts.
