Vallecito Dam Construction Project
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Contractor's haul road from Borrow Pit No. 2 to embankment looking upstream from borrow pit station 33+50/11+60. Sprinkler truck seen going away from camera has just sprinkled near side of road.
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Counterforts for left wall of spillway inlet and gate structure. Wall in foreground is at station 5+00.
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Downstream face of cut for additional cut-off trench at station 18+00, showing cross-section of embankment placed during 1938, and the source of each type of material.
64) Cut-off trench
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Cut-off trench extending up right side of spillway cut at sta. 5+84. Refer to Pine R - 312.
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Cut-off trench excavation from sta. 20+00 to the river. A small section of embankment is shown in the immediate foreground. The remainder of the trench is being prepared to receive embankment.
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Cut-off trench, looking toward right abutment from sta. 33+50.
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Demonstration of Oshkosh-Southwest earth mover dumping.
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Demonstration of Oshkosh-Southwest earth mover loading in the earth borrow pit.
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Dome of gate chamber and base of stair shaft after forms were stripped.
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Downstream end of the earth borrow pit. Dam is in background.
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Downstream side of additional cut-off trench showing sand pocket. Taken from axis at station 15+75.
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Looking downstream in the river channel just prior to closing the temporary cofferdam. The box culvert seen at right center carried the flow of the river while the dam was completed.
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Looking downstream in Pine River showing new channel excavated by contractor to divert the river away from the spillway stilling basin. At extreme right, a portion of the power shovel can be seen excavating in the stilling basin.
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Looking downstream at entrance to diversion channel. Unsuitable material from spillway excavation is being wasted at left side of channel to be used for constructing the temporary cofferdam.
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Looking downstream at left gate pier form before nose form was placed.
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Looking downstream in spillway gate structure at left gate pier. Refer to Pine R - 361.
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Looking downstream at left gate pier form after reinforcement was installed, but before nose form was placed. Refer to Pine R - 347.
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Looking downstream along partially refilled temporary diversion channel from dam axis station 22+00, 95 ft. downstream from axis. Toe of cobble fill in foreground.
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Looking downstream at temporary cofferdam about 30 minutes before gate in box culvert was closed. The gate can be seen just below the dragline bucket.
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Dressing slopes of cobble fill on downstream face of dam with dragline.
