Since its completion, the $18.6-million Pecos Street Bridge Over I-70 Replacement Project has received national attention for its innovations. It was one of the first CM/GC projects at the Colorado Dept. of Transportation in both preconstruction and construction.

Photo courtesy of Kiewit Infrastructure Co.
The $18.6-million bridge replacement project had no recordable safety incidents.

Using accelerated bridge construction, the project team delivered a quality project sooner than would have been possible using traditional methods. The 159-ft-long, cast-in-place, post-tensioned concrete box girder superstructure was constructed off site in a nearby parking lot.

The substructure was built under the existing bridge. During a 50-hour closure of I-70, one of Colorado's busiest Interstates, crews demolished the bridge and used self-propelled modular transports to move the 2,400-ton, fully constructed superstructure onto I-70, then more than 700 ft along the freeway to its final location. This was the first time SPMTs had been used to transport a bridge in Colorado.

The project team implemented the first Kiewit-specific Speak Up, Listen Up (SULU) program. The SULU initiative encourages people on the jobsite to report any unsafe or potentially hazardous situation. In addition to SULU, Kiewit held weekly safety tours, recognized a safety crew each month and handed out Why I Work Safe badges as personal motivators. Work crews also held site-specific formal and informal training sessions for skills such as rigging, tie-offs and signaling. The project had no recordable safety incidents.

Pecos Street Bridge Over I-70 Replacement


Key Players

Owner Colorado Dept. of Transportation

Lead Design Firm Wilson & Co. Engineers & Architects

Structural/Civil Engineer Wilson & Co. Engineers & Architects

General Contractor Kiewit Infrastructure Co.

Heavy Transport Contractor Mammoet USA