City Tunnel No. 3 is one of the largest infrastructure projects in the United States. It was begin in 1970 and is nearing completion. Completion of the tunnel will allow maintenance work to be done on Tunnels 1 and 2, which have been in continuous operation since their completion early in the 20th century. The new tunnel begins at Hillview Reservoir in Westchester, then travels south through the Bronx. Valve chambers allow portions to be shut down and to redirect water flow. The largest valve chamber is located underneath Van Cortlandt Park. There are other valve chambers underneath Central Park and Roosevelt Island. The Tunnel splits in midtown, one leg going east to Queens and then Brooklyn, another south on the West Side of Manhattan. There are shafts to allow for access every few miles, and each shaft has a distinctive ventilation tower. Photographs of the shafts can be seen in a previous blog entry.
Shaft 2b, City Tunnel No. 3, Bronx, New York
Shaft 2b, City Tunnel No. 3, Bronx, New York
Shaft 13b, City Tunnel No. 3, New York, New York
City Tunnel Nol 3, Queens, New York
City Tunnel No. 3, Brooklyn, New York
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