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: "With the bridge complete and open, the bridge, dam and lake now share the Black Canyon. January 14, 2011. Note: This is the uncropped version of this photograph. I chose to crop out the horizon for use in the book and exhibition." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "From the air, the structural and geographic relationships between the bridge and dam are revealed." 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: "With the bridge unlit at night, except along the pedestrian walkway, evening illumination comes from the dam and the Nevada hairpin turn of the original highway." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "Nevada side bridge construction showing the old highway and hairpin turn, April 28, 2009." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "Upstream view of the complete and open bridge at dusk, January 12, 2011." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge