Vallecito Dam Construction Project
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Dumped riprap on upstream face of embankment in the vicinity of station 20+00.
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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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Dumping riprap from bottom dump Euclid near the top of existing embankment.
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Looking along axis towards centerline of spillway from an elevated position over the right bank.
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Eighteen yard Euclid bottom dump truck in operation hauling No. 1 material. Note that tires are on surface during full load conditions. Truck at 23+40 on extreme upstream edge of fill.
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Material seen in foreground shows the type of material that is being placed in the 18-inch filter blanket at downstream toe of dam. Cobbles are in the cobble-fill section.
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Excavating and loading rock at borrow pit for dumped riprap on upstream slope of embankment.
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Excavating clay in Borrow Pit No. 1, station 121+50/61+75. Cut is about 9 feet.
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Excavating in bedrock at upstream right hand corner of trashrack structure.
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Excavating rock for foundation for the trashrack structure.
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Excavating sand for concrete. Borrow pit is about one mile upstream from dam.
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Excavation for outlet conduit, looking downstream from station 6+00. Bulldozer in foreground is cleaning off bedrock.
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Excavation to bedrock for placing lean mass concrete foundation under spillway inlet wall at left side, station 5+30 and 5+84. End of embankment cut-off wall placed in 1938 is seen in foreground. Refer to Pine R - 310.
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Looking toward right abutment from axis sta. 7+75. Le Tourneaus are seen excavating additional cut-off trench in center of picture, and placing the material directly into the fill in the old river channel in the foreground.
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Looking toward left abutment from sta. 20+00. Additional cut-off trench excavation in foreground. Refer to Pine R - 167.
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Excavating additional cut-off trench. Looking toward left abutment from axis at sta. 20+00. Refer to Pine R - 167 and 171.
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Excavating additional cut-off trench through embankment placed in 1938. Taken from point 25 feet upstream from dam axis at station 17+00.
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Excavation for additional cut-off trench, looking toward left abutment from axis sta. 14+90. Excavation is practically complete. Junction with secondary cut-off is at rear end of shovel. Refer to Pine R - 183.
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Excavation of additional cut-off trench looking toward right abutment from axis sta. 16+50. Right side of cut is in primary cut-off trench placed in 1938. Shovel is working in original foundation material. Refer to Pine R - 182.
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Excavation for additional cut-off trench, looking toward right abutment from axis station 16+75. Excavation is complete and bottom of trench is a minimum of 6 ft. into glacial till. Refer to Pine R - 188.
