Mount Vernon Viaduct

San Bernardino, CA.   •   $107 million value   •   2020 – 2024

As sponsoring partner of the Traylor-Granite Joint Venture and in partnership with COWI, Traylor is executing the Mount Vernon Viaduct Design-Build Project for the San Bernardino County Transportation Authority. The original Mount Vernon Avenue Viaduct is a 1,016-foot bridge built in 1934 that 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’s considered an obsolete and deficient structure by Caltrans and has been closed several times due to structural cracking.

Replacing the bridge will be extremely challenging because the bridge spans over 20 railroad tracks, including five passenger rail tracks servicing the San Bernardino Station (three Metrolink train lines, plus Amtrak), three transcontinental freight tracks out of the LA/Long Beach Port complex, six storage tracks and six intermodal yard tracks.

The 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.