Photographer's notes: "The final tub girder of the bridge's construction is brought into position, April 15, 2010. Note: I desired to switch my location for these final installation shots, but it would have been impossible to relocate to the top of another cliff in time to document the event. Nobody consults the photographer about the 'best time of day' to accomplish some tasks!" Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "With all of the tub girders installed for the bridge its functional structure was complete. Only the roadbed remained to complete. April 15, 2010." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "View of the Arizona side of the bridge with Sugarloaf in the background. With the bridge unlit at night, except along the pedestrian walkway (still under construction), evening illumination comes from the lighting of the dam and the moonlight. July 26, 2010." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "An aerial view of the structurally complete bridge in early morning light. The lower access road, which leads down to the dam's powerhouse, can be seen in the bottom of the image." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "Aerial view of the structurally complete bridge, Hoover Dam and Lake Mead, July 27, 2010. The highline crane has been disassembled and removed." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "Aerial view of the structurally complete bridge, Hoover Dam and Lake Mead, July 27, 2010. The highline crane has been disassembled and removed." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "Detail of highline crane system used as the main way to deliver materials for construction of the bridge, April 30, 2009." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge