Modjeski and Masters was tasked by the Southern Pacific Transportation Company to design a replacement structure to their existing railroad swing span bridge. A new bridge featuring a 288-Foot lift span was selected.
Construction commences on the new Napa River Bridge substructure on an alignment just South of the existing trestle. Shown here is construction progress on the new approach trestle as of November 1977.
Work starts on the new lift span at an adjacent project site. Superstructure construction would begin for the lift span towers and approach trestle. Shown here is the float-out operation for the old swing span and the float-in of the new lift span. This was completed on June 6, 1979.
The new Napa River Bridge is completed and open to rail traffic on October 20, 1979. The structure continues to serve the client (now Union Pacific) well to this day.