Clark Avenue Railroad Underpass, Railway bridge in West Las Vegas, United States.

The Clark Avenue Railroad Underpass is a concrete viaduct that carries Bonanza Road beneath Union Pacific Railroad tracks, displaying Art Deco design details from the 1930s. The structure sits at the intersection of Bonanza Road and the railroad lines and continues to serve vehicle and pedestrian traffic today.

The Clark Avenue Railroad Underpass was built in 1937 by the Works Progress Administration, a New Deal agency that put unemployed workers on public projects during the Great Depression. It replaced a dangerous crossing of the Union Pacific tracks, giving Las Vegas a safe route to settlements west of the city. A later widening of Bonanza Road altered the structure.

The structure shows how Las Vegas developed in the 1930s by connecting people on both sides of the railroad tracks. This crossing made it easier for western residents to reach the main city.

You can view the viaduct from Bonanza Road or the surrounding streets that pass beneath the railroad tracks. It is accessible during all hours and requires no special precautions to view the structure from outside.

The bridge takes its name from Clark Avenue, the street it crossed when built; that road was later renamed Bonanza Road, so the older name survives only in the structure's official title. It now carries Nevada State Route 579.