Photographer's notes: "Aerial view of the Black Canyon and Colorado River downstream from both the dam and bridge, February 3, 2010."

Photographer's notes: "Aerial view of the winding original road descending to the dam on the Arizona side with the new bypass road under construction in the upper right, February 3, 2010." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "Aerial view showing the twelve central girders installed as support for the eventual bridge deck and the Nevada side hairpin turn, February 3, 2010." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "Aerial view showing the twelve central girders installed as support for the eventual bridge deck, February 3, 2010. Lake Mead marina at the top." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "Evening aerial view of the dam and bridge. Twelve tub (box) girders spanned the central pier caps of the bridge forming part of the substructure for the roadbed. Note: This photo was taken well after sunset and was only possible because of the state of digital technology in 2010." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "A solitary ladder extends from the arch to a walkway between tub girders below the road deck, April 13, 2010." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "View from the river up to the Arizona side. Deck construction was still in progress. Note: This was the only time I was given access to this particular point of view on the Arizona side beneath the bridge." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge