New Croton Dam Underwater Inspection

Atlantic Engineering, A JMT Company, performed the underwater inspection of the New Croton Dam.


Westchester County, NY


New York City Department of Environmental Protection

The New Croton Dam is part of New York City’s water supply system. The structure, 297 feet high with a 266-foot-wide base, was completed in 1906.

Atlantic Engineering, A JMT Company, performed an underwater inspection of the dam to determine the presence of any cracks.

The work included a visual underwater inspection of the upstream face of the main dam at approximately 100-foot intervals to a depth of 100 feet. An additional depth of 100 to 130 feet was inspected using a remote operated vehicle (ROV). Twelve locations were inspected along the dam, documenting defects on continuous video. In addition, the upstream face of the scour pipe was inspected using the ROV. A tracer die was deployed into the scour pipe at a depth of 130 feet to detect the presence of any leaks.