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351 - 375 of 2123 Items << < 10 11 12 13 14 15 16 17 18 19 > >>
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miles wide, with a drop of over 400 feet. By way of comparison, Niagara Falls, one mile wide and with a drop of only 165 feet, would have been dwarfed by Dry Falls. The power at this point of the Ice Age diverted Columbia River was at least that...
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The acreages under existing developments served from the main stem of the Columbia are shown, by counties, in the following tabulation:
Land irrigable under existing works—Main stem of
Columbia River
Acres
Location
Total
Irrigated...
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Crane hooking on to the 24-foot intermediate shaft of generating unit L-1. Hinged fixtures facilitate bringing the shaft into a vertical position, with the fixture at the left uppermost.
1942-01-29
2024-04-26 |
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A slide occurs adjacent to the U.S. Construction highway and upstream from the dam. Later in the year, another slide occurred in this same area to damage the highway and the rubble masonry retaining wall. See CB 4932
1940-06-11
2024-04-26 |
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Waiting for foundations for bents to join high trestle ends, across deep crevice. Whirley and cantilever cranes on section of trestle to the right. Cross-river cofferdam in upper part of photograph.
1937-06-24
2024-04-26 |
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The road to the dam disappears under fog. Frequently, in winter, fog lies in the canyon, obscuring the river.
1942-01-22
2024-04-26 |
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Bucking rivets on Shasta #1 (unit A) scroll case with a moveable mechanical device.
1942-07-28
2024-04-26 |
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Stator of Westinghouse 108,000-kw. generator L-1 being set in place over finished steel blocks and anchor bolts embedded in concrete, concentric with the axis of the turbine.
1942-01-16
2024-04-26 |
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Floating crane removing falsework used to construct arch-type bridges over the spillway section of the dam.
1941-11-22
2024-04-26 |
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This is a night scene as viewed from above the west abutment. As the width of the dam narrowed toward the top the work became more and more concentrated, and the scene lost much of its immensity, but thus while it lost in illusory fancy it gained...
2024-04-26
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In order to fit together the sections of the plate-steel scroll cases of the Allis-Chalmers turbines built for the Shasta plant, bolts, tightened with impact wrenches, were placed in all the rivet holes through shells and butt straps.
1942-07-25
2024-04-26 |
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Control cable tunnel, two-thirds of a mile long and 12 feet in diameter, for carrying the electrical lines that will someday join the dam's two powerhouses into a common network. Conduits have been embedded in the concrete floor, and cable trays,...
1941-11-17
2024-04-26 |
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Hydraulic jacks in position, preparatory to the lowering of a drum gate in the spillway section of the dam. The gates were assembled in their raised position.
1941-05-23
2024-04-26 |
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Construction in progress on the el. 1180 mix plant, the incline aggregate conveyors, and the el. 1180 construction trestle. The workmen in the foreground are pouring footing piers for a warehouse and shop building.
1938-07-26
2024-04-26 |
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Here is shown the river at flood stage during the spring of 1936. The east cofferdam area has been deliberately flooded to save the temporary wooden cofferdam. Work on the east end of the MWAK high trestle has been suspended, but erection of the...
2024-04-26
2024-04-26 |
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Workmen removing pins in a steel span of Marcus Bridge at Coulee Dam. The salvaged steel was used in buildings, principally in the assembly building.
1942-02-25
2024-04-26 |
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Workmen stringing cable for a 115,000-volt line from the west powerhouse to the switchyard.
1942-04-01
2024-04-26 |
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Erection of the scroll case of Shasta turbine L-8. This view shows men using sledge and flatter to lay up a butt strap, after heating.
1942-07-25
2024-04-26 |
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The east powerhouse from the mixing plant.
1942-09-28
2024-04-26 |
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Excavation activity at west tailrace slide area. The West Vista House formerly stood to the left, in front of the shaft cribbing which shows above the end of the dragline boom.
1941-04-18
2024-04-26 |
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Reinforcing around 24-ft. diameter octagonal penstock blockouts, units E1 and E2. Elevation 1024 trestle in upper in upper part.
1937-04-23
2024-04-26 |
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Selected material from volume three of: "A History of the Columbia Basin Project: Volume III"
2024-04-26 |
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Typical blocks of concrete in the dam. Bents in upper part support high placing trestle.
1936-05-01
2024-04-26 |
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Riggers working on the aggregate conveyor suspension bridge high above the river.
2024-04-26
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The concrete is being placed on the east side in some of the deep crevices in the bedrock Table of Concrete Strengths. 6"x12' test cylinders, 28 day. Low - heat cement - 4,928 cylinders averaged 4,195 lbs. per sq. in. - Modified cement - 5,180...
2024-04-26
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