Thanks for the link water monkey this was the second paragraph, and I came across these snakes on the river bank.
The water snake is found in and around almost any water body or wetland in NY state. As an adult, it is a stout animal typically dark brown to black with lighter-colored bands and splotches along its length. This is most pronounced in young individuals (adults may appear solid black). It is the only large (up to 42 inches) water snake in our range. This species is frequently called or mistaken for a cottonmouth (water moccasin); this latter species is a large venomous snake that does not occur within our state borders. This confusion is understandable as our water snake is certainly an aggressive species with a nasty disposition and it does bear a superficial resemblance to the cottonmouth.