The reservoir is the collecting point for the water from all six reservoirs in the Catskill Mountains: the Ashokan Reservoir, the Cannonsville Reservoir, the Neversink Reservoir, the Pepacton Reservoir, the Rondout Reservoir, and the Schoharie Reservoir. It also receives water from the Croton Falls Reservoir, the Muscoot Reservoir, the New Croton Reservoir, and the West Branch Reservoir through the Catskill and Delaware aqueducts, along with water from Rye Lake.