I love talking to people in NC about snakes.....lol.
First off....we do have timber rattlers near where I live.....but I've never seen one. The copperhead wouldbe the most dangerous snake in my parts (realistically).
Second......ANY time ANYONE sees a snake near water, here......it's a Water Moccasin. Funny thing is....I don't believe there's a water moccasin this side of I95