I-25 North Express Lanes Segments 5 & 6

Colorado Department of Transportation Region 4 | Longmont and Loveland, CO
highway construction

Benesch provided preconstruction and construction management services for this $300 million CM/GC project to widen approximately six miles of I-25 from four lanes to six. Due to funding constraint, several alternatives were developed to deliver a buildable project that fits within the revised budget. This involved looking at the corridor from a macro level and evaluating different typical sections or interchanges as well as on the micro level and refining specific locations or bridges. The I-25 bridge over the Great Western Railroad (GWRR) is a good example of this approach.

The original scope included constructing a new structure that clear spanned the ROW at the current vertical clearance requirements. To save money on the structure, as well as enable the project to potentially re-use the existing I-25 pavement as an overlay through this stretch, a concept was developed to jack and widen the existing structure. Benesch helped brainstorm this concept and ultimately present it to the GWRR for approval.

The project had two unique features: a 42-inch DIP high pressure waterline that needed to be relocated and two railroad overpass bridges that would be jacked and widened. Benesch led the coordinating of these efforts with the water districts and Great Western Railroad.