Vallecito Reservoir, Colorado
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Cut-off trench excavation looking toward left abutment from a point opposite sta. 24+00. The excavation is complete from the transit in foreground to the group standing in bottom of trench.
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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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Excavation for cut-off trench from point near station 21+00 looking toward right abutment.
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Rock excavation for concrete cut-off wall footing, looking toward left abutment from opposite station 3+75.
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Looking along centerline of cut-off trench toward the left abutment from opposite station 9+00.
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Placing concrete for cut-off wall footings at left abutment.
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Rock excavation for cut-off wall footing looking toward left abutment from point opposite axis at station 3+00.
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Looking toward right abutment from axis station 7+75 showing sump for upper drainage system seen in Pine R - 174.
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Installation of foundation drainage system on upper bench at upstream side of cut-off trench, left abutment.
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Looking toward right abutment in cut-off trench, showing mechanical tamping of embankment over foundation drainage system.
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Looking along center line of cut-off trench toward left abutment from opposite dam axis station 8+00. Note rock excavation for cut-off wall footing in center.
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Concrete cut-off wall on left abutment. Portion of cut-off trench in foreground has been refilled, covering the wall. Refer to Pine R - 160.
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Placing concrete for cut-off wall footings at left abutment.
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Looking toward left abutment from axis station 7+75 showing in foreground the installation of foundation drainage system at upstream side of cutoff trench. This installation is on the bench shown in upper left hand corner of Pine R - 157.
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Same view as Pine R - 158 after approximately 30 feet of embankment has been placed. Note grout risers and top of c.m.p. sump.
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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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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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Looking toward left abutment from sta. 20+00. Additional cut-off trench excavation in foreground. Refer to Pine R - 167.
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Embankment placing in old river channel, where operations are being concentrated at present. The No. 3 section is seen in foreground grading into the downstream No. 2 section near rock-rake and trucks.
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Placing embankment in additional cut-off trench. Looking toward right abutment from axis sta. 16+25. Refer to Pine R - 188 and 195.
