Photographer's notes: "The second of the final four tub girders is flown into position via the highline crane, April 15, 2010." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "The final tub girder of the bridge's construction appears to be moving into position for installation, but it is really being brought into position for a photo opportunity by the ironworkers, April 15, 2010." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

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