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Suncore Nears Finishing UDOT’s $91M I-15 Hamilton Fort Rebuild Project By Irwin Rapoport
CEG CORRESPONDENT
A Cat 374 excavator lifts a large rock.
Numerous cranes lift a bridge girder into place.
Suncore expects to deliver the Utah Department of Transportation’s (UDOT) $91.1 million Interstate 15 Hamilton Fort interchange and climbing lane project south of Cedar City in Iron County in late fall. The design-bid-build project, financed by state funds, began in spring 2025. Crews are adding a northbound climbing lane to an existing 13-m.-long two-lane road from the Kanarraville rest stop to the South Cedar Interchange (milepost 43 to 56) and reconstructing the northbound east side of the Hamilton Fort interchange (Exit 51) with a roundabout. “The project was needed to improve safety and traffic
operations on one of Utah’s most heavily traveled freight and tourism corridors,” Devin Squire, UDOT’s project manager, told Construction Equipment Guide. “Northbound I-15 climbs approximately 3,000 feet in elevation between St. George and Cedar City, where slow-moving trucks create bottlenecks and long vehicle platoons. The additional lane provides dedicated space for heavy vehicles while allowing passenger traffic to maintain more consistent speeds. The improvements to the interchange enhance access and reduce conflict points.” Crews are rebuilding the northbound side of the interchange bridge, including constructing a new bridge deck and making structural improvements, Squire said. That work also improves the bridge clearance and extends the structure’s service life. “This section of I-15 is one of the most critical transportation corridors in southern Utah, serving local, regional, interstate and international travel,” he said. “It is the primary north-south freeway connecting the rapidly growing communities of St. George, Cedar City and Iron County with the Wasatch Front, Nevada, Arizona and California. The corridor carries substantial freight traffic and provides access to major destinations.” A multidisciplinary consultant team headed by Avenue Consultants Inc. completed the design in 2024, which required tweaking. “A major high-pressure natural gas transmission line conflicted with the proposed improvements, requiring extensive coordination with the utility company to develop a relocation plan that aligned with the project’s schedule while minimizing delays,” Squire said. “In addition, an existing waterline had an uncertain location despite available records, requiring additional investigation, coordination and flexibility during design to reduce the risk of conflicts during construction. see HAMILTON page 6