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Sump from cofferdam with outlet pipes and spillway. North end of block 40 at the left, and cluster "G" to the right.
1937-04-01
2024-11-25 |
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Steel piling of cell cluster under part of which was leak in cofferdam, March 17, 1937.
1937-05-28
2024-11-25 |
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Shovel, bulldozers, and buggies removing overburden in east tailrace area. Riprapped tailrace slope shown in upper right, and excavation conveyor in foreground. East tower of aggregate suspension-bridge in upper part of photograph.
1937-03-12
2024-11-25 |
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5-yard shovel removing overburden in river channel east of block 40.
1937-03-17
2024-11-25 |
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View of the east face of block 40, with a rock drilling crew in the foreground. Inspection and grouting galleries appear on extreme left.
1937-03-17
2024-11-25 |
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The east abutment, showing rock prepared for concrete, and several blocks which have been poured along the upstream side of the dam.
1937-03-26
2024-11-25 |
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Drill holes are blown out with compressed air, which accounts for the haze of dust surrounding these drillers.
1937-03-26
2024-11-25 |
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Excavation of rock and common in river channel near downstream cross-river cofferdam. Draglines cleaning out crevice, and jackhammers drilling holes for blasting. Tripod for 36-inch Calyx hole to left of center in foreground. Conveyor in left center.
1937-04-02
2024-11-25 |
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Exposed bedrock in the center section, looking west toward block 40. Derrick equipment mounted on the steel cell on the left, and other equipment to be mounted on the timber crib located on the rock, are to be used for cleanup of rock, and for...
1937-04-29
2024-11-25 |
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Removing weathered and unsound surface rock in the bottom of the Columbia River channel.
2024-04-25
2024-11-25 |
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4-yard shovel, 12-yard truck, and powder crew on rock cleanup in east tailrace area.
1937-06-04
2024-11-25 |
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Drilling weathered rock at top of foundation, east end of dam.
2024-04-25
2024-11-25 |
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Drilling on high points of granite in foundation bedrock on east end of tailbay.
1937-06-04
2024-11-25 |
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Deep crevice being cleaned out by shovels prior to extending elevation 1024 trestle.
1937-06-23
2024-11-25 |
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Placing concrete footings for bents of high trestle in crevice on the east side.
1937-07-09
2024-11-25 |
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Deep crevice crossing dam foundation in blocks 68 and 69. Note steel footing for trestle bent in upper left corner.
1937-07-23
2024-11-25 |
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Jackhammer drills operating in foundation, east end of dam.
1937-07-23
2024-11-25 |
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Deep crevice on east end - location of frozen arch dam was across spill of dark-colored flow near upper left corner.
2024-11-25
2024-11-25 |
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Frozen dam across slide moving into deep crevice at about block 66.
1937-10-01
2024-11-25 |
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Top of "ice dam" showing hose connecting refrigerating points, 3-inch pipe.
1937-11-01
2024-11-25 |
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"Ice Dam" and refrigerating plant, located upstream from block 66.
1937-11-01
2024-11-25 |
