Photographer's notes: "Tub girder and ironworker shadow on the Nevada side bridge deck, February 2, 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: "A return to the view of the bridge from the dam sidewalk first taken in April 2009. January 13, 2011." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "A return to the view of the bridge from the dam sidewalk first taken in April 2009. January 13, 2011." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "Ironworkers set a precast pier segment, November 10, 2009." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "Upstream view of the bridge and dam. The growing arch segments on the Nevada and Arizona sides of the canyon moved toward their rendezvous over the Colorado River." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "A view of the bridge, dam and Lake Mead at dusk. Pier and pier cap construction can be seen along the length of the arch." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge