Vallecito Reservoir, Colorado
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Placing forms for outlet works gate chamber, air shaft, and spiral stairway shaft.
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Inside forms and reinforcement in place for outlet works gate chamber and spiral stairway addition
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Looking downstream in outlet works. Placing inside forms for gate chamber. Hand-tamping embankment over conduit seen in foreground.
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Looking toward left abutment in bottom of cut-off trench from point opposite axis sta. 9+00. Note drainage system at left side of trench has been covered with tar paper preparatory to placing embankment. Grout pipes can be seen extending up the side of the trench for grouting the system.
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Looking toward river channel in bottom of cut-off trench on left abutment, showing foundation drainage installation. Drains will carry water to a corrugated metal pipe sump set in a concrete box. Water is being pumped from temporary sump at extreme left during installation.
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Same view as Pine R - 157 after placing of embankment had started. Note mechanical tamping operations along contact at left side and around pump sump.
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Looking toward left abutment in cut-off trench from axis at sta. 9+00. End of concrete cut-off wall is seen in center.
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Looking toward left abutment from axis sta. 20+00. Le Tourneaus are starting excavation for the additional cut-off trench in the foreground.
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Foundation drainage system. Note grout risers at right side of trench for grouting system after embankment has been placed.
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Looking upstream at sump for foundation system from station 8+00.
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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.
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Placing embankment in additional cut-off trench. Looking toward right abutment from axis station 15+75.
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End of completed additional cut-off trench at axis station 19+50, taken from station 18+25. Refer to Pine R - 190.
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Downstream side of additional cut-off trench showing sand pocket. Taken from axis at station 15+75.
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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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Looking downstream in inlet channel to outlet works from outlet works station 4+50, note 3 to 1 slope directly behind trashrack which will be riprapped.
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Looking downstream in outlet conduit from sta. 6+75. showing placing of compacted embankment over conduit. Refer to Pine R - 134.
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Placing forms and reinforcement for gate chamber and addition to spiral stairway shaft.
