Vallecito Reservoir, Colorado Archive Search Results
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Looking across river channel toward right abutment from station 6+75. Timbering in test pit No. 11 is seen in partially excavated cut-off trench. Note sand deposits on each bank of the river.
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Panorama of river channel looking downstream from top of cofferdam at sta. 11+30. Cut-off trench excavation in foreground. Note sand deposits on each bank of river.
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Panorama of left abutment after clearing and stripping. Dragline is cleaning up preparatory to placing embankment in permanent cofferdam. Embankment seen in 82a is temporary cofferdam from waste material. Gravelly material on left bank is being used in inverted filter. Tripod supports sump pump. Taken from point 300 feet upstream from station 13+00.
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Looking across top of permanent cofferdam toward right abutment showing progress of filling the space between the two cofferdams. Refer to Pine R - 104.
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Bedrock in cutoff trench at right abutment as it looked when first exposed and before any rock excavations were done.
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Le Tourneau and bulldozer spreading waste material between temporary and permanent cofferdams.
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Panorama of river channel looking downstream from the top of the cofferdam, station 11+25, showing sand deposit to the right and left of river channel. Refer to Pine R - 120 a, b, & c.
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Close-up of sand deposits in cut-off trench on the left bank of the river channel.
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Looking upstream from top of embankment at sta. 1+00. The slope at left foreground is ready for riprap. Note shoulder at right where riprap abuts the road ramp constructed by the contractor, which will be left to form a blanket at the left abutment.
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Placing dumped riprap on upstream slope of embankment in vicinity of sta. 33+00. Dragline is being used to grade material to the required slope.
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Looking along upstream slope of dam from station 2+00 toward right abutment . Some hand placing is being done, to bring the riprap to grade. Note stockpile of riprap along crest of dam for use after parapet wall is placed.
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Looking downstream in river section from point on waste pipe on right side of river. End of left half of the permanent cofferdam is seen back of the tripod. Refer to Pine R - 83.
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Looking downstream in river section from point on waste pipe on right side of river. Foundation for a portion of the cofferdam is seen at extreme left.
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Looking toward left abutment from sta. 14+60 in cut-off trench. Excavation for trench across the river is complete and ready for refilling.
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Looking toward right abutment in bottom of cut-off trench from sta. 8+50. Dragline is removing timbers from Test Pit No. 11.
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View of cofferdam looking upstream from a point 115 feet downstream from axis at station 13+00.
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View from opposite station 16+00 looking toward left abutment. The partially excavated secondary cut-off trench is seen in the distance. The primary cut-off trench is in the middle background.
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Looking along the upstream face of the permanent cofferdam toward the right abutment. The trucks and Le Tourneaus are on top of the temporary cofferdam, wasting sand from embankment stripping to fill the spade between the two dams.
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Looking toward left abutment along alignment of secondary cut-off trench from axis station 16+00. The trench has been refilled with compacted embankment in foreground.
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Looking toward left abutment from station 16+50. Placing impervious embankment in old river channel.