Photographer's notes: "Evening aerial view of the dam and bridge. Twelve tub (box) girders spanned the central pier caps of the bridge forming part of the substructure for the roadbed. Note: This photo was taken well after sunset and was only possible because of the state of digital technology in 2010." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "Roadway on Nevada side bridge approach, Hoover Dam Bypass, April 29, 2009."

Photographer's notes: "With the bridge complete and open, the bridge, dam and lake now share the Black Canyon." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "Afternoon aerial view of the river, bridge, dam and Lake Mead, January 14, 2011. Note: The structural relationship between the bridge and the small bridge over the Arizona spillway can be easily seen." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "Evening view of the Arizona arch segment. Temporary pylons supported cable stays, which in turn supported the arch segments during their construction." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "Aerial view by early morning light shows the relationship between the respective arches of the dam and bridge, September 10, 2009." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "A view of the bridge, dam and Lake Mead at dusk. Pier and pier cap construction can be seen along the length of the arch." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge