This strange circular pit containing pipes stands in the dam plaza. It’s surrounded by an iron fence and you can see the falls in the background. I have no idea what it is, or what its use was. Perhaps it was some kind of long abandoned water feature, possibly a fountain of some kind?. Maybe the pressure of the water forced it up through the pipes, from where it cascaded down and formed a pool, which subsequently drained into the Croton River? So far I’ve been unable to discover any additional information.
If I’m right that it was formerly a fountain then it’s a shame it’s no longer working. It must have been quite spectacular in its day.