Cleft Ridge Span

The Cleft Ridge Arch in Prospect Park. Built in 1871-72, it was the last of five arches constructed in the park. The arches were a key feature of the design of Prospect Park, serving as pedestrian underpasses, allowing visitors on foot to avoid the bridle paths and carriage drive. This archway connects the Concert Grove with the Boathouse area. It is constructed of a type of molded concrete called Beton Coignet, and was one of the first commercial uses of concrete. I was surprised to learn this, since when I think of concrete construction, I think of big, ugly grey slabs ad blocks.