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Two-Span UDOT Bridge Rolled into Place Overnight
Posted by Tasha Weiss on April 14, 2011 at 9:13 AM.

The Utah Department of Transportation and contractor Provo River Constructors (PRC) made history overnight on March 26-27 with the successful move of the Sam White Bridge over Interstate 15 in American Fork, Utah. Working with the longest two-span bridge ever moved by Self-Propelled Modular Transporters (SPMTs) in the Western Hemisphere, crews set the new bridge into place at approximately 4 a.m. on March 27 and reopened the freeway at 7 a.m., three hours ahead of schedule. The move was part of UDOT’s $1.725 billion Utah County I-15 Corridor Expansion (I-15 CORE) freeway reconstruction project.



PRC, the consortium of expert local, regional and national contractors and engineers acting as the project’s design-build contractor, constructed the 354-ft, 1,900-ton structure on falsework in a “bridge farm” along the east side of I-15. A steel-plate girder design was chosen for the Sam White Bridge due to its relatively light weight and its ability to follow the profile grade line. AISC / NSBA member Utah Pacific Bridge & Steel Corporation, Lindon, Utah, fabricated the steel for the bridge, which was designed by the Moon Township, Pa.-based Michael Baker Jr., a member of the PRC consortium.


Moving the bridge perched 21 ft in the air involved precise coordination. The two-span structure was raised off the falsework, then moved simultaneously using four lines of SPMTs, which are hydraulic jacks on wheels, controlled by a single joystick.


After raising the structure off its falsework, crews moved the bridge approximately 500 ft across eight freeway lanes—which included rotating it to the crossing’s final 48-degree skew—and lowered into place. To see a two-minute preview and animated simulation of the move sequence, go to UDOT’s five-minute time lapse video of the actual move is also available at


Located 30 miles south of Salt Lake City, the Sam White Bridge is one of 59 new, modified or rebuilt structures on the 24-mile Interstate reconstruction project. The state-funded project is reconstructing the highway from Lehi to Spanish Fork which connects the northern and southern halves of the state. The I-15 CORE project is scheduled for completion by December 2012. To learn more about the bridge-related aspects of the project, visit

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