Rondout Reservoir - Statistics

Statistics

The resulting body of water is a single basin 6.5 miles (9.7 km) long, 2,052 acres (8.2 km²) in area and reaches a maximum depth of 175 feet (53.3 m) near the dam. Mean depth is 73.8 feet (22.4 m). Elevation is 840 feet (256 m) above sea level.

It holds 49.6 billion US gallons (188,000,000 m3), which comes not only from the reservoir's own 95 square-mile (247 km²) watershed but from Cannonsville, Neversink, and Pepacton reservoirs via the Delaware and Neversink tunnels as well. Since those three are in the Delaware River watershed, Rondout is considered by the city's Department of Environmental Protection to be part of the Delaware system despite being firmly within the Hudson River watershed itself.

Combined, the four reservoirs account for 1,012 square miles (2,631.2 km²) of watershed and 320.4 billion US gallons (1.213×109 m3) of capacity, 890 million US gallons (3,400,000 m3) of which goes to the city daily — 50% of the entire system's capacity. All this water is fed from the Rondout to West Branch Reservoir in Putnam County via the Delaware Aqueduct, the world's longest continuous underground tunnel at 85 miles (136 km).