 The reservoir was completed in 1905 and serves as the main collecting point for all the reservoirs in the Croton Watershed (except for the New Croton Reservoir, which later receives its water).It is almost 8 miles (almost 13 km) long, can hold up to of water at full capacity, and has a 76 square mile (121.6 km²) drainage basin.Water from the Muscoot Reservoir flows down the balance of the Muscoot River, then enters the Croton River to flow into the New Croton Reservoir.