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A rock crew working on the pumping plant foundation. A general program of blasting and excavating a successive series of benches, the back wall of which was trimmed to the specified slope of 1/4 to 1, was followed.
1938-07-26
2024-11-24 |
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Drilling completed for a round of blasting in a pumping plant discharge tunnel. This is the horizontal section of the tunnel and is 21 feet in diameter.
1938-07-26
2024-11-24 |
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Excavation in progress on the pumping plant foundations and in nine of the twelve pumping plant discharge tunnels.
1938-08-24
2024-11-24 |
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Excavation in progress on the rock point known as "Dragon's Tooth" which was removed to provide space for a future parking area.
1938-06-30
2024-11-24 |
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Blockouts completed for the elevation 934 outlet works conduit gates by the Mason-Walsh-Atkinson-Kier Company. They are 26'-10" x 30' in size, with floor elevation at 917.5 and the top at elevation 975. Due to the inability of the Hardie-Tynes...
1937-01-24
2024-11-24 |
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Completed blockouts for the el. 934 outlet works conduit gates. Due to the fact that the ring follower and paradox conduit gates could not be delivered until late in 1937, the blockouts were provided for their future installation. Consolidated...
2024-11-24
2024-11-24 |
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The 1938 high water of the Columbia River tops the upstream spillway blocks and floods the blockouts left for the outlet works gate installations at el. 934. The maximum flow for 1938 was 361,680 second feet.
1938-05-28
2024-11-24 |
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A gate body casting for the elevation 934 outlet works, ready for shipment to the dam. This casting weighs approximately 19-1/2 tons, and was manufactured by the Hardie-Tynes Co. Birmingham, Alabama.
1938-04-11
2024-11-24 |
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A gate leaf for a Paradox service gate in the elevation 934 outlet works installation. This unit weighs 26-1/2 tons.
1938-10-21
2024-11-24 |
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A gate body casting for the elevation 934 outlet works is lowered into a blockout. The 102-inch ring seal gates will be installed.
2024-11-24
2024-11-24 |
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The downstream of one of the el. 934 conduits showing condition of concrete prior to refinishing. The circular blockouts at the contraction joints are also visible. Upon completion of concrete cooling and contraction joint grouting in this area...
1938-01-01
2024-11-24 |
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Construction is started on the trashrack structures for the main unit penstocks. The steel falsework supports the wooden forms.
1938-09-27
2024-11-24 |
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Upstream penstock liner section number 1-2 is lowered to its final resting place in the dam.
1938-10-14
2024-11-24 |
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The first 18 ft. diameter penstock liner sections are installed at Grand Coulee Dam. These are the upstream bulkhead sections No. 1-2.
1938-10-26
2024-11-24 |
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A main unit penstock inlet transition form is lowered into position upstream and adjoining the steel penstock inner section No. 1-2.
1938-11-09
2024-11-24 |
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A main unit penstock inlet transition form is lowered to line and grade. This form will be embedded in concrete; it can be used only once, and after the concrete hardens, it will be completely dismantled.
1938-11-09
2024-11-24 |
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The masked workman is cleaning up hardened concrete in preparation for pouring new concrete. He is operating a wet sandblast "gun" and when the high velocity sand has cut away the laitance and surface coating of cement, a water jet will be used to...
2024-11-24
2024-11-24 |
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The improved type of sandblast gun developed by Consolidated Builders. Compressed air and sand flow through the large hose and water through the smaller hose to be discharged together at a high velocity. The valve permits the operator to control...
2024-10-24
2024-11-24 |
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Workmen compact newly poured concrete with electrically powered vibrators.
1938-09-30
2024-11-24 |
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A workman wearing wooden "snowshoes" sets a "hairpin" anchor wire in the new concrete. When the concrete hardens, a form tie rod can be fastened to the "hairpin";
1938-09-23
2024-11-24 |
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Typical appearance of mass concrete upon completion of pour.
2024-11-24
2024-11-24 |
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Workman operating a chipping hammer. Defective concrete areas on the downstream face of the dam and elsewhere are chipped out, and the void filled with new concrete.
1938-08-25
2024-11-24 |
