A fork in the Yonkers pressure tunnel. 1913.
The village of Shokan, which lies within the territory claimed for the west basin of the Ashokan Reservoir. 1906.
The town of West Hurley, which was included in the territory taken for the east basin of the Ashokan Reservoir. 1906.
The chosen site of the Olive Bridge Dam in Esopus Creek. 1906.
Piers are built in the bed of Esopus Creek to support pipes to carry the flow of water. 1907.
Esopus creek at the Olive Bridge dam site, showing coffer-dams and two lines of 8-foot steel pipes for carrying the flow of the creek. 1907.
Work in progress on the cut-off trench under the masonry portion of the Olive Bridge Dam. 1908.
The first concrete block is placed on the downstream face of the Olive Bridge dam. 1908.
The upstream stream face of the masonry portion of Olive Bridge dam with a temporary opening for the flow of Esopus creek. 1909.
Ashokan Reservoir workers in camp. 1910.
The downstream face of the Olive Bridge Dam under construction. 1910.
An earthen embankment is placed and compacted with a steamroller on the upstream face of the Olive Bridge Dam. 1910.
The downstream face of the Olive Bridge dam. 1911.
The Ashokan Reservoir’s upper gate-chamber from the East Inlet channel, with aqueducts for drawing water from the reservoir.
Earth is dumped into the reservoir on the upstream face of the Olive Bridge Dam. 1914.
The concrete core-wall of the Ashokan Reservoir’s middle dike. 1910.
Earth is dumped to form an embankment against the west dike of the Ashokan Reservoir. 1910.
The inlet and gate house between the two basins of the Ashokan Reservoir, with two arches of the Ashokan Bridge in progress. 1914.
The Ashokan Reservoir’s waste weir and spillway. 1914.
A train crosses the Glenford dike next to the east basin of the Ashokan Reservoir.
The Ashokan Reservoir’s waste weir and spillway leading to Esopus creek.
The excavation of the old Kensico Dam in preparation for the construction of a replacement.
The excavation for the foundation of the Kensico Dam in progress. 1912.
Travelling derricks place concrete blocks on the downstream face of the Kensico Dam. 1913.
Derricks maneuver concrete blocks into place on the Kensico Dam. 1914.
Inside the completed Kensico screen chamber. 1914.
The downstream face of the Kensico Dam. 1914.
A decorative granite facade is applied to the downstream face of the Kensico Dam. 1915.
The east pylon of the Kensico Reservoir, with its fountain and cascade basin. 1917.
Concrete lining is applied to the bottom of the Hillview Reservoir in Yonkers. 1914.
An aqueduct pipe under construction with a “cut-and-cover” method. 1910.
A work crew on a stretch of “cut-and-cover” aqueduct.
The Kensico Bypass Aqueduct. 1910.
The excavation of the Bonticou Tunnel in progress. 1911.
The Garrison Tunnel in the process of timbering and bench mucking. 1911.
Drills bore into the bed of the Hudson River at Storm King Mountain, where the Cats𝓀𝒾𝓁𝓁 Aqueduct crosses from the west side of the river to the east, 1,100 feet underground. 1907.
The top of Shaft 7 of the Moodna pressure tunnel, with the Hudson River in the background. 1910.
A surveyor takes cross-section measurements with a sunflower instrument in the City tunnel south of Shaft 16. 1913.
Inside the Rondout pressure tunnel. 1911.
A section of the Rondout pressure tunnel with finished concrete lining in place. 1910.
Pressure valves inside the Cats𝓀𝒾𝓁𝓁 Aqueduct.
Inside a completed 16-foot, 7-inch-diameter section of the Yonkers pressure tunnel. 1917.
The Ashokan screen chamber aerates the daily flow of 376 million gallons of water. 1917.