Cottonmouths and Copperheads aren't just aggressive, they're down right MEAN! One of my nephews killed a 5' 1" Copperhead a couple of months ago after it bit his dog. The snake is bigger than it looks in the pic, my nephew is 6' 4" and the dog probably weighs 80-90lbs. He ended up killing 5 or 6 of these things in a 2 week period!
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5'1' is uncommonly big for a copperhead. A 3 footer is large, typically.
It is mating season and more sightings will be happening right now. I've seen several pics on the webs in the last 2 days.