We will complete construction of Stage 2 and begin repairing Water Tunnel No. 1
Construction on Water Tunnel No. 3, the largest and most expensive capital project in the city's history, began in 1970. The 60-mile tunnel was designed in four stages, beginning at the Hillview reservoir in Yonkers, traveling through the Bronx, moving south to the tip of Manhattan and then on to Brooklyn and Queens.

Stage 1, which serves northern Manhattan and parts of the Bronx, was projected to cost $238 million and be completed within eight years. It finally opened in 1998-at a cost of a billion dollars. (See case study on following page: Water Tunnel No. 3)

Stage 2 is currently under construction in Brooklyn, Queens, and Manhattan and will begin delivering water in two stages: the Brooklyn/Queens leg will open in 2009, with the Manhattan leg following in 2012. Although Stage 2 will not provide full redundancy for the in-city distribution, its completion will enable Water Tunnel No. 1 to be shut down for repairs, which are estimated to cost $365 million.

Progress (as of 4/22/08):
The City completed the tunneling of the Brooklyn/Queens leg in 2001 and the construction of shafts on this leg is significantly complete. DEP completed the mining of the Manhattan leg of Water Tunnel No. 3 in 2006. Construction of the shafts and the lining of the Manhattan leg continues. Activation is scheduled for 2013.

We will complete Stages 3 and 4 of Water Tunnel No. 3
The third stage of the water tunnel, also known as the Kensico-City Tunnel (KCT), will extend from the Kensico Reservoir to the valve chamber in the Bronx. This 16-mile section, currently in the planning stage will provide critical redundancy between the Kensico and Hillview reservoirs. Although this stage is estimated to cost between $4 and $6 billion, just $239 million is currently included in the 10-year plan.

Stage 4 of Water Tunnel No. 3 will be 14 miles long and run from the valve chamber in the Bronx under the East River into Queens. It will provide more distribution in Queens and provide full coverage during the eventual shutdown and repair of Water Tunnel No. 2

Progress (as of 4/22/08):
Preliminary design (10%) for the construction of Stage 3, also known as the Kensico City Tunnel, is nearly complete. Given the long-term nature of Stage 4, design has not yet started.