New York City Water Tunnel No. 3

New York City Water Tunnel No. 3 is a water-supply tunnel forming part of the New York City water supply system. It is being built by the New York City Department of Environmental Protection (NYCDEP) to provide New York City with a third connection to its upstate water supply. The tunnel will serve as a backup to Water Tunnel No. 1, completed in 1917, and Water Tunnel No. 2, completed in 1936.

Water Tunnel No. 3 is the largest capital construction project in New York City history. Construction began in 1970. Portions of the tunnel were placed into service in 1998 and 2013 and the remaining sections are expected to be complete by 2032.

The complete tunnel will be more than 60 miles (97 km) long, travel 500 feet (150 m) below street level in sections, and will cost over $6 billion.

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