The Cannonsville Reservoir is a reservoir in Delaware County, New York, that was formed by impounding over half of the West Branch of the Delaware River. It is the westernmost of New York City's reservoir, being at the western portion of the Delaware Watershed. Placed in service in 1964, it is the most recently constructed New York City-owned reservoir. Delaware County is a county located in the state of New York. ... The West Branch Delaware River, approximately 90 mi (144 km) long in the U.S. states of New York and Pennsylvania, is one of the two branches, along with the East Branch, that join to form the Delaware River. ... Flag Seal Nickname: The Big Apple, The Capital of the World[1], Gotham [2], Metropolis Location Location in the state of New York Government Counties (Boroughs) Bronx (The Bronx) New York (Manhattan) Queens (Queens) Kings (Brooklyn) Richmond (Staten Island) Mayor Michael Bloomberg (R) Geographical characteristics Area     City 1,214. ... 1964 (MCMLXIV) was a leap year starting on Wednesday (the link is to a full 1964 calendar). ...

It is also the biggest NYC reservoir by surface area at 455 square miles (728 km²). The reservoir contains 95.7 billion gallons (36.2 million m³) of water at full capacity. This water flows over halfway through the reservoir to enter the 44-mile (70.4-km) West Delaware Aqueduct in Tompkins, New York. Then it flows through the aqueduct into the Rondout Reservoir, where the water enters the 85-mile (136-kilometre) Delaware Aqueduct. The gallon is a unit of volume used for measuring liquids (as well as dry matter). ... Tompkins is a town located in Delaware County, New York. ... Spillway at eastern end of Rondout Reservoir. ... The Delaware Aqueduct is an aqueduct that takes water from the headwaters of the Delaware River in New York State to the Kensico Reservoir in Westchester County just north of the Bronx and forms the bulk of New York Citys drinking water supply. ...

The Delaware Aqueduct then continues through the West Branch Reservoir and the Kensico Reservoir in the Croton Watershed, in Westchester and Putnam counties north of the city. The aqueduct continues further south through the Hillview Reservoir in Yonkers, and then continues through The Bronx, Queens, and Brooklyn, eventually ending in Staten Island, providing New York City with about 25% of their drinking water. Westchester County is a suburban county with about 940,000 residents located in the U.S. state of New York. ... Putnam County is a county located in the state of New York. ... The Bronx is one of the five Boroughs of New York City in the United States. ... Queens Borough in New York City, in yellow Queens is the largest in area and second most populous of the five boroughs of New York City. ... A map of New York City, highlighting Brooklyn. ... Staten Island, in yellow, lies to the southwest of the rest of New York City. ...