Old Croton Dam

The Old Croton Dam is a historic dam located in Yorktown, Westchester County, New York, now lying submerged beneath the waters of the New Croton Reservoir. The dam was built on the Croton River between 1837 and 1842, and was the first substantial masonry dam in the United States. Construction was delayed by a January 1841 storm that washed away most of the dam, with heavy downstream damage and loss of life.

The gravity dam constructed with a rubble core and granite ashlar foundation, it was 57 feet high and 670 feet long. The dam impounded water from the Croton River watershed, forming a reservoir several miles long to the northeast along the path of the Croton River. Water flowed to New York City through the Old Croton Aqueduct, which starts just upstream of the dam and carries water down the Croton River valley toward the Hudson River, and roughly follows the Hudson south.

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