Utah Demonstration Project: Route 6 Spanish Fork Bridge Deck Replacement
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Utah Demonstration Project: Route 6 Spanish Fork Bridge Deck Replacement

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    Final Technical Brief
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    As a part of the HfL initiative, the FHWA provided a $500,000 grant to the Utah Department of Transportation (UDOT) to replace a structurally deficient deck of bridge C-679 that carries US-6 over the D&RGW railroad line near the US-6 and I15 interchange south of the Provo area. The railroad carried approximately 8 to 25 trains every day. The existing US-6 bridge is located just west of the US-6/US-89 intersection (Moark Junction) at approximately milepost (MP) 177.88. This portion of US-6 serves as a gateway between the Wasatch Front, recreational areas, and transportation corridors like I-70. The C-679 bridge, located at the mouth of Spanish Fork Canyon and spanning two sets of Union Pacific railroad tracks, provided connectivity to I‐15 for recreational vehicles, commuters, and commerce. Ultra-high-performance fiber-reinforced concrete (UHPC) was the primary innovation on this project, which faced some design challenges that resulted from the bridge skew of approximately 46 degrees and the bridge reverse superelevation because of its location at the intersection of two reverse horizontal curves. The large skew, varying superelevation, and three-span configuration made this bridge a good candidate for the use of ultra-high-performance fiber-reinforced concrete (UHPC) at the joints and closure pours between precast deck panels to provide a new deck for the bridge. The project involved 2 construction phases, Phase I and Phase II, wherein existing bridge decks, asphalt overlay, and parapets were removed, and new precast concrete parapet and deck panels placed. There were no worker injuries reported during the construction period. Thus, the contractor exceeded the HfL goal for worker safety (incident rate of less than 4.0 based on the OSHA 300 rate). There was one work zone related crash/motorist injury during construction. However, the crash was unrelated to the work zone features or the work done during construction. The total funding on this project was $3,059,468, and project expenditures totaled $2,891,688.
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