 Put into service in 1895, West Branch is one of 12 reservoirs in the system's Croton Watershed, and second northernmost.It receives the flow of the upstream Boyds Corner empoundment, and, when needed, of Lake Gleneida, a controlled lake in the City supply system.Primarily, however, it receives water from the much larger Rondout Reservoir in the Catskill Mountains on the west bank of the Hudson River via the Delaware Aqueduct.