2010 Top 10 Roads - No. 10

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PROJECT: I-15 Widening
LOCATION: Salt Lake City, Utah
COST: $115 million
LENGTH: 4.1 miles
DESIGNER: Parsons Transportation Group
CONTRACTORS: Kiewit Western Co./W.W. Clyde & Co.


This project consisted of widening the mainline highway with an express lane and three general-purpose lanes. Three bridges also were replaced, calling for the longest prestressed concrete girders set in the U.S. at 197 ft in length. Several structural innovations were used, including the tip-grouting of drilled shafts to increase vertical capacity. The I-15 bridge over Beck Street is the first UDOT operational seismic bridge design.

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