Site preparation-- general view of rock cleanup
1937-04-29 | Grand Coulee Dam
Columbia Basin Project, Grand Coulee Dam. Exposed bedrock in the center section looking west toward block 40. Derrick equipment mounted on the steel shell on the left and another which is to be mounted on the timber  located on the rock, are to be used for cleanup of rock and placing concrete.
Site preparation-- removing surface rock
1937-4 | Grand Coulee Dam
Columbia Basin Project, Grand Coulee Dam. Bedrock in the old river channel, showing the natural water-worn rock surface as it is found under a bed of clay and boulders left in the canyon during the last ice age, and the operation of removing surface rock to provide for a firm and watertight connection between bedrock and the dam.
Site preparation--removal of overburden
1933-12-14 | Grand Coulee Dam
Before designs for the structure could be completed contract for the removal of two million yards of overburden was let to David H. Ryan. A slide along the left bank increased the amount of material to be handled to three million yards. Grand Coulee Dam, Columbia Basin Project, Washington
Spillway and drum gate construction--spillway section from left bank
1944-08-16 | Grand Coulee Dam
General view of the spillway section of Grand Coulee Dam, taken from the west bank for the Columbia River. On this date, approximately 80,000 cubic feet of water per second was plunged nearly 350 feet vertically down the face of the dam, creating a waterfall more than twice the height of Niagara. An additional 25,000 cubic feet of water per second is passing through the hydro-turbine installed in the west powerhouse.
Spillway and drum gate construction--transition form for inlet
1940-06-12 | Grand Coulee Dam
Transition form for inlet to 57-inch supply pipe for drum gate control. One of these water supply inlets is in each pier for a total of 11. A 57"" butterfly valve will be connected to this inlet for control of water supply.
Spillway and drum gate construction--west side downstream view of
1941-08-21 | Grand Coulee Dam
View of a portion of the spillway section showing formwork and falsework for construction of spillway bridge spans. The construction trestle appears below the formwork. Eight of the 102-inch outlet tubes are shown in use for diversion of the river flow (right)