The Croton Dam

The New York City Department of Environmental Protection closed the public walkway atop New Croton Dam for five days earlier this month, creating a safe work zone for an inspection of the dam.

The closure allowed a team of rope-access technicians to rappell down the face of the dam and inspect the stones that were used to build the structure 115 years ago. It was the largest dam in the world when it was completed in 1905.