This project included the conceptual, preliminary, and final design of the I-25 Viaduct, spanning Broadway, Light Rail Transit (LRT), and UPRR rail tracks on Colorado’s busiest transportation corridor. As part of this project, the GM2 Complex Bridge team also developed standards for CDOT precast U-girders, enhancing the project’s overall efficiency and consistency.

The viaduct carries ten lanes of traffic, along with shoulders and an exit ramp. The total structure length is approximately 1,700’ with typical spans of 140’.

To ensure uninterrupted six-lane Interstate traffic during construction, the viaduct was built in three phases, progressing from south to north, with each phase measuring approximately 58’ in width. Each phase of the viaduct is supported by a 70’ long post-tensioned integral pier cap, set at a 45-degree angle with a single column to optimize the space beneath. The foundations consist of drilled shafts.