South San Francisco, California

Caltrain - Airport Blvd Bridge (San Mateo County, California)
Built 1927
Steel stringer bridge over Airport Blvd on Caltrain
Open to traffic

SSF Centennial Trail - Cut Stone Bridge (San Mateo County, California)
Built 1863
Stone culvert bridge over Runoff Channel on Centrnnial Trail (Former Southern Pacific Railroad)
Open to pedestrians