Archival objects in this container: Rock formations in Colorado River area: photographic print, approximately 1930 to 1935 Canyons and cliffs in Colorado River area: photographic print, approximately 1930 to 1935 Broken rock in Colorado River area: photographic print, approximately 1930 to 1935 Proposed dam site in Black Canyon: photographic print and slide , approximately 1930 to 1932 Gauging station on Arizona side of dam site: photographic print, approximately 1930 to 1932 Arizona side, gauging station for river depth: photographic print, approximately 1930 to 1932 Cutting a road about three miles above dam site: photographic print and negative, approximately 1930 to 1932 Blowing dynamite to cut road about three miles from dam site: photographic print, approximately 1930 to 1932 Cutting a road about three miles above dam site with squatter's camp, Ragtown, Nevada, in the background: photographic print, approximately 1930 to 1932 R.G. LeTourneau contractors cutting road to dam with a carryall "earth mover": photographic print, approximately 1930 to 1932 Power shovel building road to the dam site: photographic print, approximately 1930 to 1932 R.G. LeTourneau equipment building the road to the dam site: photographic print and negative, approximately 1930 to 1932 Power shovel cutting lowest road to the diversion tunnels: photographic print and negative, approximately 1930 to 1932 Close up of power shovel cutting lowest road to the diversion tunnels: photographic print and negative, approximately 1930 to 1932 Gravel washing plant on Nevada side: photographic print, approximately 1930 to 1932 Close up of gravel washing plant: photographic print, approximately 1930 to 1932 Bridge across the Colorado river to gravel pit, Nevada to Arizona side, approximately ten miles up from the dam: photographic print, negative, and slide , approximately 1930 to 1932 Looking down at mixing plant location near dam site: photographic print, approximately 1930 to 1932 Building one of the cement upper mixing plants: photographic print and negative , approximately 1930 to 1932 Water tanks for upper batch cement plant: photographic print, approximately 1930 to 1932 Water pumps for upper batch cement plant: photographic print, approximately 1930 to 1932 Pump used to get water to upper batch plant: photographic print and negative, approximately 1930 to 1932 Extension of water pipe to upper batch plant: photographic print and negative, approximately 1930 to 1932 Lower cement mixing plant: photographic print and negative, approximately 1930 to 1932 Pump station at lower batch plant: photographic print and negative, approximately 1930 to 1932 Load More