Aerial view showing the twelve central girders installed as support for the eventual bridge deck, February 3, 2010. 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: "Evening bridge deck construction. On the Nevada side, four girders remain to be installed, two of which are on the far bridge deck. The last four tub girders were installed on 15 April 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

Photographer's notes: "View up to the Nevada side from the Arizona side of the powerhouse with birds and jet, awaiting installation of the final four tub girders, April 15, 2010." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "View up to the Nevada side from the Arizona side of the powerhouse with the first of the final four tub girders installed, April 15, 2010. Note: Someone was the first person to walk across the span completed when this girder was installed. I never learned who that person was." 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