Wilson & Company was the lead designer for Ames-Wadsworth Joint Venture and was awarded the Utah Department of Transportation’s (UDOT) design-build project I-15 – Lehi Main Street to SR-92 Widening (known as the Tech Corridor). The I-15 Tech Corridor serves as the primary route between Provo and Salt Lake City. With only four lanes in each direction between Salt Lake County and Utah County, this corridor created a bottleneck resulting in traffic delays. The $278 million interstate widening and reconstruction project involved three interchanges, three braided ramps, 13 bridges and large culverts, more than 20 miles of storm drain system, the addition of a new detention pond and upsizing others, the relocation of irrigation canals, and water quality boxes.

Lehi City had considerable offsite flows that came to the eastside frontage road before crossing I-15. Additionally, an irrigation line crossed I-15 in the area. The existing Lehi storm drainage needed to be collected while the irrigation needed to remain active during construction. To accomplish this, a temporary siphon under I-15, along with using the existing storm drain system in the frontage road, was used until a completely new storm drain system could be constructed in the frontage road.

Minor widening of SR-92 was required as well. The storm drainage system, recently installed, was in good condition. Our team connected the new storm drain system to the existing system. This limited the need to cut up SR-92 and saved time and money by reusing the existing storm drain system.

This project was delivered on time and under budget, while providing an improved transportation system that alleviates traffic, accounts for the growth of the surrounding areas, and supports multimodal travel.