Photographer's notes: "On the end of the Nevada arch segment, ironworkers prepared formwork prior to pouring the next concrete section, July 1, 2009." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "On the end of the Nevada arch segment, ironworkers prepared formwork prior to pouring the next concrete section, July 1, 2009." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "Night time from the top of the Arizona side temporary pylons looking down through the cable stays to the Arizona bridge deck. Notes: This is one of the few hand held night time photographs from the project. This was the only evening I was allowed on top of the temporary pylons to shoot." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "Nighttime view from the top of the temporary pylons down to the Arizona bridge deck, July 1, 2009." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "View from the dam sidewalk downstream toward the bridge, before dawn, July 2, 2009." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "A small temporary bridge is built in the gap between the Arizona and Nevada sections of the arch. Someone was the first person to walk from one side to the other. July 2, 2009." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge

Photographer's notes: "Final concrete pour, which formed the keystone of the arch and completed its structure. Photographed from the Arizona side north or the bridge. August 10, 2009." Site Name: Mike O'Callaghan-Pat Tillman Memorial Bridge