The head looks like it might be a pit-viper. If it is, I'd call it a Rattler. If you can find the area of the "Anal Plate", look at the scales. A double row of scales means it is a non-venomous snake. Our non-venomous snake scales will divide into 2 rows after it passes the Anal plate. This is not the case with venomous snakes.
Going back the a rattler, it's tail looks like no other, but the skin on it does not shed, so there won’t be a tip found on the shed.
Quite true Bob.
We do have plenty of watersnakes that can appear like the pattern and coloration of a copperhead. Makes fishing a sometimes excitingly adventure.