The original Mount Vernon Avenue Viaduct was built in 1934 and spans over the Burlington Northern Santa Fe Railroad (BNSF) Railway Intermodal Yard in the City of San Bernardino. The bridge provides access to rail and mass transit facilities at the San Bernardino Santa Fe Depot and is a connecting link for pedestrians and cyclists to economic centers within the city. The bridge had severely deteriorated to the point that some of the spans had to be supported with temporary shoring. It was deemed to be a deficient structure by Caltrans and has been closed several times due to potential structural failures.

The projects scope of work includes demolishing the Mount Vernon Avenue Viaduct; preparing the site for BNSF Railway and other construction prior to shoofly completion, without impacting the railroads; and constructing a replacement structure. The new structure will be twice as wide (80-feet) and utilize drilled shaft foundations, T-Wall approach walls, cast-in-place substructure, Caltrans precast girders, partial depth precast deck panels, and a cast-in-place deck.