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US-91 Diverging Diamond Interchange – Brigham City, UT

Original Contract Amount:  $7,248,476.37

Awards:  AGC Rural Highway Project of the Year

 

The 1100 South project is an A + B bid project, with 330 days being bid. It consists of replacing the existing structure over I-15, and reconfiguring the interchange into a “Diverging Diamond Interchange”. To accommodate the wider foot print, fill had to be placed early to start a 6 month settlement period. The structure was built in 2 phases in order to maintain traffic. This required building a temporary sheet pile wall to hold up fill at the phase line. Geofoam was utilized in the fill at the structure to eliminate settlement issues. This had to be designed and approved before installation. Precast walls were placed around the fill at the structure. Closures of I-15 were allowed for both girder sets and for bridge demolition. A 56 hour full closure of 1100 South (SR- 91) was allowed in order to place bonded wearing course, final striping, barrier, curbs and signals needed to make the interchange functional.

Overall, project went well. We had a good team of RLW people on site, and quality subcontractors. Project was finished early with 14 days of bonus. UDOT and the public are very pleased with the final project.

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