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If it didn't try to kill you and just seemed mildly annoyed at you for disturbing its nap, it was a water snake. Looks dead on just like a cottonmouth, but without the white mouth, deadly venom, and bad attitude. When I was a kid, I was playing in the front yard and was supposed to be watching a younger sibling who was about 3 or 4. I saw said sibling over by some tall hedges reaching under them and messing with something. I went over to see what he was doing and found him petting a three foot snake such as you have pictured. Naturally I picked him up and teleported to the other side of the yard. When my dad came out and poked the snake with a rake handle it just looked at him and slithered off. We lived right on a pond and had both water snakes and cottonmouths. Just looking at them, they are pretty much identical.