Vallecito Reservoir, Colorado
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Looking toward left abutment from end of secondary cut-off trench opposite station 16+50, showing embankment placing operations in old river channel.
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Placing the 12-inch diameter sewer-pipe toe drain. The boards were used to gauge the 6 inches of 3/4-inch to 1.5-inch gravel required to be placed about the pipe. The remainder of the trench was filled with small cobbles.
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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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Looking toward right abutment from axis.
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Looking toward right abutment from axis.
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Looking at downstream slope of embankment from a point in the old river channel about 600 ft. downstream from axis. Slope near the crest of the dam has not been graded. Note piezometer well cover at station 11+75 in center of picture.
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View of cut-off trench looking toward left abutment from opposite station 15+50, showing sand deposits being removed. Refer to Pine R - 121.
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Looking toward right abutment in bottom of cut-off trench from station in 10+50. Note sand deposit on left side.
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Close-up of sand deposit in cut-off trench on right bank of the river channel.
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Looking upstream at dam toward right abutment from a point about 500 feet downstream from axis at sta. 22+00. Note transition in slopes of cobble fill. Temporary diversion channel was in foreground and has been refilled.
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Using dragline to trim slopes of cobble fill on downstream face of embankment.
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View of dam looking downstream from a point on left side of reservoir, approximately 1/4 mile upstream.
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Panorama of dam looking downstream from a point on right side of reservoir about 1200 feet upstream from axis. (Photographic point No. 5). Downstream end of Borrow Pit No. 1 in foreground.
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Panorama of dam looking downstream from point on right side of reservoir, about 1200 feet upstream from axis - Photographic point No. 5 - Elevation of fill 7663.5.
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View of dam looking downstream from a point on left side of reservoir, approximately 1/4 mile upstream.
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View of dam looking upstream from a point approximately 3/4 mile away.
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Looking along axis toward left abutment from centerline of spillway. (Photographic point No. 1). Note portion of cut-off wall covered with canvas in foreground, and panel forms being set for another portion.
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Looking along axis toward left abutment from centerline of spillway. (Photographic point No. 1). Refilling of cut-off trench in foreground is nearly complete.
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Looking along axis toward left abutment from centerline of spillway. (Photographic point No. 1).
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Looking along axis toward left abutment from centerline of spillway. Excavation for cut-off trench is practically complete.
