Archival objects in this container: Water pump and power shovel: photographic print and negative, approximately 1932 Bottom of Black Canyon before construction of dam: photographic print, approximately 1932 Looking upstream from dam site, water running through diversion tunnels: photographic print, approximately 1932 Black Canyon basin: photographic print, approximately 1932 Bedrock base of Black Canyon and first forms poured for dam: photographic print and negative, approximately 1932 Load of men lowered into the canyon: photographic print, approximately 1933 Man riding cable hook to Colorado River basin: photographic print and negative, 1933 Welding shop on Arizona side of Colorado River: photographic print, approximately 1933 Welding shop at the end of diversional tunnel: photographic print, approximately 1933 High scalers on the canyon walls: photographic print, approximately 1933 Hauling high scalers up their work stations: photographic print, approximately 1933 Close up of high scalers: photographic print, approximately 1933 Constructing pilot tunnel: photographic print and negative, approximately 1931 to 1932 View of the pilot tunnel: photographic print, approximately 1931 to 1932 Wood tunnel done by Lewis Construction Company in canyon wall toward dam site: photographic print, 1931 View of canyon wall during construction of the diversion tunnel: photographic print, approximately 1931 to 1932 Truck hauling debris out of diversion tunnel: photographic print, approximately 1931 to 1932 Construction of diversion tunnel from the inside: photographic print and negative, approximately 1931 to 1932 Area where water broke through on small cofferdam by diversion tunnel during a flood: photographic print, approximately 1931 to 1933 Diversion tunnel after a flood: photographic print, approximately 1931 to 1933 Close up diversion tunnel after a flood: photographic print, approximately 1931 to 1933 Men pumping water out of diversion tunnel after a flood: photographic print, approximately 1931 to 1933 Bulldozing after a flood: photographic print, approximately 1931 to 1933 Interior tunnel no. 4: photographic print, 1931 Looking into diversion tunnel: photographic print, 1932