About the project

  • City of Montclair, CA
  • Location: Montclair, CA
The City of Montclair, in cooperation with SBCTA and Caltrans, recently constructed (2019) a grade separation project carrying Monte Vista Avenue over UPRR right-of-way consisting of two sub-divisions, Los Angeles and Alhambra with 6 mainline tracks by means of a two-span concrete structure. The project has resulted in safety improvements, as it eliminated the at-grade crossing conflict between vehicular traffic and rail traffic. In addition, this project has reduced the congestion and inconvenience caused by the previous at-grade facility.

Project Description

The new structure features precast prestressed and post-tensioned spliced girder bridge supported on Type I CIDH pile bents and short-seat type abutments supported on massive MSE wall embankments, and conventional retaining walls, extensive drainage improvements, two new bypass roads to reconnect State Street, major utility relocations (7) by undergrounding them due to creation of a new underground district during the design phase, traffic/electrical engineering, and extensive private property improvements. involving 23 private and business properties.

NCM was the prime consultant responsible for all facets of the project delivery. The spliced precast/prestressed and post-tensioned superstructure incorporated a variety of architectural treatments to enhance the project’s aesthetic value to the local community. Close coordination was required with SBCTA, who required a significant reduction in the original design schedule to meet funding deadlines.

NCM worked diligently with UPRR and CPUC to adhere to the railroad’s design guidelines, and standards. A construction and maintenance agreement (C&M) was successfully negotiated and executed to facilitate the temporary access and permanent improvements within railroad R/W. NCM was able to incorporate the City’s newly created utility underground district within the project limits, a district created during the design phase, by proactively and aggressively pursuing utility relocation designs and agreements.