The Croton Aqueduct or Old Croton Aqueduct was a large and complex water distribution system constructed for New York City between 1837 and 1842. It brought water by the force of gravity alone 41 miles (66 km) from the Croton River in Westchester County into reservoirs in Manhattan, where local water resources had become polluted and inadequate for the growing population of the city.
Read more about Croton Aqueduct: Background, Construction, Impact On The City, Old Croton Trail