Vallecito Dam, Durango, Colorado
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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.
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Inlet channel to outlet conduit, looking downstream. Structure seen in center is the concrete mixing plant.
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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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Looking downstream in outlet conduit from sta. 6+75. The conduit is being covered with 3 feet of loose earth to protect it from freezing. The earth is being placed by the contractor and will be removed in the spring, at his own expense. Refer to Pine R - 97.
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Looking downstream in outlet conduit from station 6+75. Note backfilling operations. Refer to Pine R_ 61, 69, 74, 88, 97, 107, & 124.
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Looking along center-line of cut-off trench toward left abutment, from a point opposite sta. 27+50. The location and angel of view is approximately the same as to Pine R - 32, 39, and 55.
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Looking along left abutment cut-off trench toward right abutment from opposite station 3+00 (Dam axis). Note rock excavation for concrete wall footing in middle foreground and seepage near foot of slope on the right.
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Looking toward left abutment in bottom of cut-off trench from station 9+70. Note sand deposit on each side of trench.
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Placing embankment in cut-off trench at intersection with temporary diversion channel.
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Looking downstream in outlet conduit from sta. 6+25. Completed excavation for trashrack structure in foreground; grout mixer and pump near center; concrete chute at right.
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Looking downstream in outlet conduit from sta. 6+75. Concrete has been placed in the invert of the trashrack and transition.
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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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Rock excavation for trashrack structure. Taken from point on rim to left of structure.
