The West Branch Reservoir, formed by impounding about one quarter of the West Branch of the Croton River, is located in Putnam County, New York, United States, in the towns of Kent, New York, and Carmel, New York, and is only about 45mi north of New York City's Central Park Reservoir.The West Branch is the second northernmost reservoir in the Croton Watershed, and is one of 12 reservoirs in the watershed. Its drainage basin is about 20 square miles (32 km²), and it can hold up to 8e9USgal of water at full capacity. The West Branch consists of two basins, separated by State Route 301. It was put into service in 1895 as part of New York City's Croton Water Supply System.The West Branch now functions primarily as part of the Delaware Water Supply System, serving as a supplementary settling basin for the water which arrives from the Rondout Reservoir, west of the Hudson River, via the Delaware Aqueduct. The West Branch Reservoir also receives water from its own small watershed and the Boyds Corner Reservoir. In addition, the West Branch is connected to adjacent Lake Gleneida, one of the three controlled lakes that are part of the City's water supply.Another function of the West Branch Reservoir is to receive water pumped in from the Hudson River during drought periods. This water enters the West Branch from the City's Chelsea Pumping Station in Dutchess County, 65mi up the Hudson from New York City. The West Branch was used very briefly for this purpose during May 1989 and during the 1965–66 and 1985 droughts.
