Tucson, Arizona

Diamondback Bridge (Pima County, Arizona)
Opened to the public on May 23, 2002, this pedestrian bridge resembles a diamondback rattlesnake.
Girder bridge over East Broadway Boulevard on Pedestrian traffic
Open to pedestrians

UP - 6th Avenue Overpass (Pima County, Arizona)
Built 1930
Steel I-beam stringer bridge over 6th Ave on Union Pacific Railroad (formerly Southern Pacfic Railroad)
Open to traffic

UP - Fourth Avenue Underpass (Pima County, Arizona)
Built 1916; replaced by new bridge 2009
Lost concrete deck girder bridge over 4th Avenue on Union Pacific Railroad (formerly Southern Pacfic Railroad)
Replaced by a new bridge

UP - Stone Avenue Overpass (Pima County, Arizona)
Built 1936
Concrete rigid frame bridge over Stone Avenue on Union Pacific Railroad (formerly Southern Pacfic Railroad)
Open to traffic