Aerial photo looking upstream before coffer dam was started; diversion tunnels cut and suspension foot bridge completed. Lower catwalk was four feet wide for personnel traffic only. 600 ft. ladder at end went up canyon wall in 40 ft. sections. "First bridge built in the lower canyon. - W.A. Davis, 1992"

Blasting rock upstream of Dam site. Note suspension foot bridge and larger, small truck bridge. Note on back: "Two men were blown up at this spot the day Wint took this photo - James J. Hester, son-in-law of W. A. 'Wint' Davis."

Railroad workers at Hoover Dam site blasting rock in the background at noon-time; this was the site where cofferdam was built. Note on back: "High scalers setting off blasts on Nevada side. - W. A. Davis."

Blasting rock at noon-time, everyday, to put anchors in place. Note cameraman in foreground. Note on back: ""Photo by 'Six Companies' photographer named Frank."" - W. A. Davis, 1992

Blasting rock at noon-time, everyday, to put anchors in place. Note cameraman in foreground. Overhead cables used to transport materials and men from top of canyon to basin.

Colorado River; Black Canyon before Dam construction. This is the signal man for one of the hi-lines. He could see the whole scene. He signaled operator what to do. Note on back: "Man is standing on the observation point constructed by Six Companies. Location of Ma Kennedy's wedding was on the observation point. - W. A. Davis."

Downstream dumps for tunnel muck; carried from river to dump.