Photographer's notes: "Workers arrive via highline crane and manbasket to start their shift on the structurally complete arch, morning, view from Arizona side, September 9, 2009." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "Aerial view of the completed 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: "Aerial view - The winding original road across the dam play off the arch of the new bridge. Note that the small bridge of the Arizona spillway echos the eventual form of the finished bridge, September 10, 2009." 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 Hoover Dam and Lake Mead from the bridge's pedestrian walkway. Before the bridge's construction, such a view would only have been possible in a helicopter. July 29, 2010." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "View of the bridge from the top of Sugarloaf on the Arizona side with Lake Mead in the background, July 30, 2010." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "View of the bridge, dam, and Lake Mead from the top of Sugarloaf on the Arizona side, July 30, 2010." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge