Located in Putnam County in the Town of Kent, almost 40 miles from New York City. Formed by damming the West Branch of the Croton River, which continues southeast to the West Branch Reservoir. Consists of one basin, 1.5 miles in length. Holds 1.7 billion gallons at full capacity. Placed into service in 1873, the dam, spillway and outlet works were rebuilt in 1990 as part of the City's complete overhaul and modernization of the 19 reservoirs in its Water Supply System.
Originally constructed as part of the City's Croton system, Boyds Corner today serves mainly as part of the Delaware system. Water from Boyds Corner flows briefly into the Croton River and then enters the City's West Branch Reservoir, where it mixes with water carried from the Rondout Reservoir, west of the Hudson, through the Delaware Aqueduct. From the West Branch, it ordinarily flows into the Kensico Reservoir, which also receives water from the Catskill system through the Catskill Aqueduct. After settling at Kensico, the water flows through two aqueducts to the Hillview Reservoir in Yonkers, were it enters the City's distribution system.
The Boyds Corner watershed drainage basin is 22 square miles, and includes portions of the Towns of Carmel and Putnam Valley in Putnam County, and East Fishkill in Dutchess County.