This underpass provides a tunnel under the railroad for the traffic on the highway. It is constructed of concrete and includes a stylized deck railing above the tunnel along the tracks. Pilasters rise at the openings of the tunnel. The underpass extends northward as a retaining wall on which the tracks sit. At the north end of the underpass wall is a pedestrian tunnel.

Statement of Significance: This underpass was constructed in 1936-1937 by the Parker-Schram contracting firm. The project, funded in part by federal relief funds available during the Great Depression, was intended to improve the old Pacific Highway by providing a safe crossing of the railroad by going under the tracks through a tunnel. Because the highway curved at that spot, the tunnel is also curved. To make room for the improved highway and the underpass, 28 feet of the bluff was cut back. The design is somewhat stylized, using elements that are associated with the then-popular Art Deco style. The total cost of the project was $289,000. The underpass is virtually intact and is an excellent example of a public works transportation project taken on by the federal relief programs in the 1930s. As such, it should be considered eligible as a contributing resource in a historic district .