New Croton Dam — HAER Color Transparency (View 2) Color transparency from the HAER survey showing the downstream face of the New Croton Dam. The dam's spillway, 1,000 feet long and 297 feet high, is one of the most impressive masonry structures in the United States. Date: c.1969 Location: Croton-on-Hudson, NY Type: aerial_photo Subjects: dam, reservoir, spillway, trees, road Source: Library of …