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I-15 CORE
Design Map

Current Progress

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.

Project Documents

Click on the headings below to view and download interactive maps, videos, brochures and other documents related to the work in each area.

Project Documents Archive

Design-Build Team

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
Fluor Corporation. Ames Construction Company, Inc. Ralph L. Wadsworth Construction Company, Inc. Wadsworth Brothers Construction Company, Inc. Fluor/HDR Global Design Consultants, LLC Michael Baker Jr., Inc. Jacobs Engineering Group, Inc. H.W. Lochner, Inc. Kleinfelder West, Inc	Intermountain GeoEnvironmental Services, Inc. CRS Consulting Engineers, Inc. Raba-Kistner Consultants, Inc. TransCore IP, Ltd. Stillwell & Associates, PLLC Applied Research Associates, Inc. Fehr & Peers Transportation Consultants Psomas CME Transportation Group

Construction Terms and Vocabulary

Bridge Elements

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. -

Alternate Route
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.

Design-Build
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.

Detour
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.

Environmental Study
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.

Fill
Scientifically processed dirt of varying sizes and grades that is used as surcharge (see "surcharge" definition below).

Interchange/Intersection
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).

Privacy Fence
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.

Surcharge
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.

Utilities
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.