Vallecito Reservoir, Colorado
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Looking along upstream face of embankment from right abutment. Slope is ready for riprap. Note trench at toe of slope to support the riprap.
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Looking toward right abutment along upstream face of embankment. Tractor is lowering loaded truck down the slope at station 9+00.
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Looking along upstream toe of embankment toward right abutment from station 7+35. Dragline is excavating a shoulder at toe of slope to support dumped riprap.
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Close-up of one awl of test pit excavated in No. 1 zone of embankment at station 22+25, 97 feet upstream from axis of dam. Purpose of pit was to determine percentage of plus 5-inch stones remaining in materials.
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Twelve yard Euclid bottom-dump truck dumping material on the upstream No. 2 section of the embankment at sta. 24+84. this material is approximately 1.5% below optimum moisture. Note the excellent condition of the embankment for truck travel.
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Sheeps-foot roller compacting upstream No. 2 material at station 20+25, 30 ft. upstream from dam axis. The moisture content of this material is approximately 1.5% below optimum moisture.
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Looking toward left abutment from top of stair shaft at 37+00, 20 ft. upstream from axis, showing different types of soil used in fill.
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Truck dumping riprap on upstream slope of dam near station 23+50.
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Looking along upstream face of dam toward left abutment from station 24+00. Bulldozer is being used to place riprap after being dumped from trucks. Note small average size of pieces compared with hat in foreground.
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Dumped riprap on upstream face of embankment in the vicinity of station 20+00.
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Dumping riprap from bottom dump Euclid near the top of existing embankment.
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Looking toward right abutment in cut-off trench from sta. 37+00. Embankment is being placed and hand-compacted on each side of the concrete wall.
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View of cut-off trench looking toward the right abutment of the dam from the upstream rim of the cut-off trench opposite station 33+50. Refer to Pine R - 71
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Cut-off trench, looking toward right abutment from sta. 33+50.
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Compacting embankment adjacent concrete cut-off wall, with air-operated sheet-piling hammers.
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Looking toward right abutment in cut-off trench. Part of footing for concrete wall is seen on slope. Wagon drill is working on 50-foot grout hole. Refer to Pine R - 66.
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Cut-off trench excavation looking toward left abutment from a point opposite sta. 27+50. Survey crew is seen working at deepest portion of trench, which was through the sand pocket at station 23+25.
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Placing concrete in cut-off wall opposite station 33+50, looking toward the right abutment. At left center concrete from the pump-crete pipe line is flowing into a hopper from which it is wheeled in buggies to the point of placement.
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Looking toward the right abutment along centerline of the cut-off trench from opposite dam axis sta. 30+50, cut-off wall is completed, and placing of hand-compacted embankment has been started.
