Photographer's notes: "The dirt road leading from the Lower Access Road to the Hoover Dam Police shooting range plays off of the arch formed by the bridge construction, June 30, 2009." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "Aerial view of Lake Mead, Hoover Dam, and the bridge under construction with reflection of the bridge in river below, June 30, 2009." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "Aerial view of the dam and completed bridge arch before construction of the piers (columns) began. From the air, the arch appeared delicate and fragile. September 10, 2009." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "From the air, the relationship of the Colorado River, bridge, dam and Lake Mead come into perspective." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "Piers (columns) near the Nevada hairpin turn, April 15, 2010." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "Tub girder, tool box and ironworker shadow on the Nevada side bridge deck, February 2, 2010." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "Ironworkers climb scaffolding around piers, November 10, 2009." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge