View from above the Croton Dam in the town of Cortlandt in Westchester County showing the spillway, gates, bridges and Croton River Valley. Hills and farmland can be seen in the distance. The dam was built in 1842 to supply New York City with water.
New York State Archives. Education Dept. Division of Visual Instruction. Instructional lantern slides, 1911-1925, A3045-78, DnCvd2
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