"1364 The open cut excavation for the Arizona spillway. The top-heading for the spillway raise has been holed through and can be seen on the spillway face. July 20th, 1932.
1312 Electric shovels used for tunnel excavation are being used in handling muck in the spillway open cut. July 14th, 1932.
1377 Another view of the Arizona spillway open-cut excavation. Trucks, shovel and other equipment are being withdrawn for a blast on the bench in the background. July 21, 1932."