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 bridge, dam and Lake Mead." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "Aerial view of a motor boat on Lake Mead near the mineral deposit banding that revealed the lower level of the Lake Mead reservoir, June 30, 2009." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "Aerial view of bridge and the hairpin turn of the old Nevada road, June 30, 2009." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

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: "View upstream of the bridge and dam. The position of the green boom indicates a concrete pour for the arch was in progress. Note: This is one of the few photographs where I supplemented existing light by adding a flash to give the hill on the left detail." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "Sunrise, looking across the canyon to Nevada. The arch was nearly complete with temporary pylons and cable stays supporting each segment. The highline crane system prepared to lower a rebar section into position." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge