I-15 CORE Project Summary
Utah made an important investment to restore and expand I-15 to support economic development and improve transportation throughout the state. I-15 CORE renovated I-15 in Utah County to meet transportation demands through the year 2030. The project:
- Added two lanes in both directions from Lehi Main Street to Spanish Fork Main Street
- Extended the express lane in both directions from University Parkway in Orem to Spanish Fork
- Rebuild and reconfigured 10 freeway interchanges and replace 63 aging bridges
- Used 40-year concrete pavement along the entire corridor.
Click on the headings below to view and download interactive maps, videos, brochures and other documents related to the work in each area.
Winter 2012 Progress Report
I-15 CORE has entered its final year of construction. With a total construction schedule of only 35 months to complete 24 miles of freeway, 10 interchanges and 63 bridges, I-15 CORE has the fastest construction schedule for a billion-dollar public highway project in U.S. history. Learn more about the progress to date and the upcoming construction activities.
AAHSTO Innovation in Motion Video
A new Transportation TV video by the American Association of State Highway and Transportation Officials showcases UDOT's cutting-edge solutions to deliver I-15 CORE faster, safer and cheaper.
I-15 Lane Shifts Video
Lane shifts occur often throughout the corridor, allowing travel lanes to remain open while construction continues. Many of these changes are moving traffic onto new concrete pavement.
2011 Summer Progress Update Brochure
I-15 CORE is nearing its halfway mark and crews are busier than ever. View the quick summary of progress to date.
American Fork 500 East DDI Video
The two-month, phased closure of 500 East will allow crews to continue construction of the new Diverging Diamond Interchange. When complete, the interchange will provide better traffic flow and increased capacity.
American Fork 500 East Navigation Map
A new diverging diamond interchange (DDI) is being constructed at American Fork 500 East. The The interchange will be similar to the new American Fork Main Street interchange. The DDI will ease traffic flow by eliminating left-hand turns against oncoming traffic.
Sam White Bridge Move
The night of March 26, crews moved the Sam White bridge into place over I-15 in American Fork. The bridge, at 354 feet long, is the longest two-span bridge ever to be moved in the western hemisphere.
Orem Interchange Construction and Closures
Reconstruction of the Orem interchanges is underway and will require several long-term closures. The closures will take place from late April through early September. Only one interchange will be restricted at a time. Construction Video and Closures Map and Information
University Parkway and Sandhill Road CFI Illustration
View an artist's rendering of the new CFI to be constructed at the University Parkway and Sandhill Road intersection.
University Parkway and Sandhill Road CFI Navigation Video
To reduce congestion and improve pedestrian and traffic flow at the intersection of University Parkway and Sandhill Road, I-15 CORE is building the first Continuous Flow Intersection (CFI) in Utah County. Watch the video to learn how the CFI works and how to navigate it.
University Parkway and Sandhill Road CFI Navigation Map
The redesigned intersection at Sandhill Road and University Parkway in Orem will be the first Continuous Flow Intersection (CFI) in Utah County. The new design will improve traffic flow for drivers accessing Utah Valley University, homes and businesses in the area.
Provo-Spanish Fork Area
Provo Center Street Interchange Navigation Map
The redesign for the I-15 Interchange at Provo Center Street creates a whole new type of interchange. This new configuration not only increases capacity, but also improves access to downtown Provo. Navigation of the interchange will work differently than drivers are used to. Explore the navigation of the new interchange.
Provo Center Street Animation
Take a preview drive of the new Provo Center Street interchange. This driver's-seat-view animation follows traffic as it navigates the different movements of the interchange. Full-Length Animation, Part 1: EB Center Street to Downtown Provo, Part 2: SB I-15 to EB Center Street, Part 3: WB Center Street to SB I-15
Provo Center Street Pedestrian Walkway
A new pedestrian walkway will be completed as part of the interchange reconstruction. The new walkway will be separated from traffic and will direct users to signalized crosswalks at the interchange.
U.S. 6 / Spanish Fork Main Interchange Construction Video
During the next several weeks, construction crews are scheduled to close various on- and off-ramps at the Spanish Fork interchange, as well as Spanish Fork Main Street, as construction moves forward at the new interchange.
U.S. 6 and Spanish Fork Main Street Interchange Illustration
View an artist's rendering of the new interchange configuration at U.S. 6 and Spanish Fork Main Street.
U.S. 6 / Main Street Interchange Animation
The I-15 interchange with U.S. 6 and Spanish Fork Main Street is being reconstructed in a new alignment, including a new signalized intersection. Watch the video to learn how it works.
U.S. 6 / Spanish Fork Main Street Interchange FAQs
I-15 CORE is reconstructing the U.S. 6 and Spanish Fork Main Street interchanges, allowing the two to work smoothly as one. Browse answers to frequently asked questions about the new interchange.
Spanish Fork Main Street/U.S. 6 Interchanges Navigation Map
Several modifications are being made to improve traffic movement at the interchanges of Spanish Fork Main Street and U.S. 6. Some of these modifications will change how motorists access U.S. 6 and I-15 in Spanish Fork.
UDOT selected Provo River Constructors (PRC), a consortium of expert local, regional and national contractors and engineers to design and build I-15 CORE. In a competitive bidding process, PRC proposed the greatest value solution within the fixed budget. PRC team members are listed below.
|Provo River Constructors|
Construction Terms and Vocabulary
The elements of a bridge all fit together like the pieces of an elaborate puzzle. Though bridges may be pre-fabricated, built in sections or built on site, each component of a bridge works together with other components to ensure that the bridge is stable and reliable upon completion. As each element plays a specific role in the creation and overall performance of a bridge, the following terms and definitions will help you understand what each element is and why it is important to the overall bridge structure.
The bridge puzzle is assembled this way: pilings provide the stability under the bridge, giving the structure underlying support. Above the pilings is the footing, which serves as the supporting base for the bridge. On top of this base are the columns, abutments and bent caps, which all provide support for the girders. The girders carry the weight of the bridge deck and thus support the weight of the vehicles traveling on the bridge.
The wing walls and retaining walls both serve as transition points, providing the stability necessary to transition from road to bridge seamlessly. The approach slab is also set into place to create a smooth transition between the road and the bridge by reducing the settlement of the ground surrounding the bridge. Parapets are put into place on the outside edge of the bridge deck to serve as a safety wall.
Definitions of Terms
- Click a term for its definition. -
An alternative course of travel taken by a driver to avoid a construction area. An alternate route is taken voluntarily, while a detour is mandated with construction barrels, signs or traffic control personnel.
All project design, construction and permit aspects are consolidated under one contractor, which accelerates the project schedule and reduces travel delays.
Clear & grub
The process of preparing ground for the construction of a roadway, including clearing away weeds and grading the corridor.
Rerouting of traffic around a construction area. A detour is mandated with construction barrels, signs or traffic control personnel; but an alternate route is taken voluntarily by the driver.
Diverging Diamond Interchange
A freeway interchange in which lanes and signals are streamlined for increased safety and better traffic flow. Click here to see a rendering.
In order for transportation improvements to be built, proper environmental clearances must be obtained. There are various levels of environmental studies: Categorical Exclusions (CATEX), Environmental Assessments (EA) and Environmental Impact Statements (EIS). Study type varies with the type of transportation improvement proposed. In the case of I-15 CORE, UDOT completed an EIS in 2008.
Scientifically processed dirt of varying sizes and grades that is used as surcharge (see "surcharge" definition below).
An interchange exists where two intersected roads are separated by a bridge to allow for more efficient traffic flow, such as the point at which a freeway intersects with surface roads. An intersection is where two roads intersect at the same level (elevation).
A concrete wall constructed to provide privacy to property owners along a roadway. A privacy fence is typically shorter than a sound wall. Privacy fence heights along Pioneer Crossing will vary, but will typically be about 8-feet tall.
Sound Wall (or noise wall)
A concrete wall constructed to reduce the impact of roadway noise on nearby residents. Sound wall heights along I-15 CORE will vary, but will typically be at least six feet tall.
Large piles of fill (see above) used to help compress the ground in a process called "settlement." This has to take place before a roadway or a bridge can be built.
Services such as water, sewer, power, communication and storm drain lines. Utility lines often parallel, intersect with or are placed underneath roadways. Construction crews must work on these lines, occasionally moving them so they won't be damaged when roadwork begins.