Wow, that’s pretty incredible. This morning while walking to work I passed the mill pond in Van Cortlandt Park and the Department of Environmental Protection was there. I bet they had just unclogged the drain as the water level was back to normal.
Sometimes when the pond overflows it turns up some unusual stuff on the ground after the water recedes. In the past I have found ancient looking oyster shells on the ground after flooding. Today I was surprised to see what appeared to be clams just south of the mill pond next to the path on the stone dam. One of the clams was still alive. I guess there are freshwater clams living in the mill pond.

