That thick, heavy body and the coloration sure looks like a cottonmouth. But, the close-up of the head gives away it's disguise. It's a non-poisonous watersnake.
Look at the close-up of this cottonmouth's head: Photo
Or this one: Photo
I think the one you have is a diamondback watersnake. Can't be certain with out closer inspection.
BR
Look at the close-up of this cottonmouth's head: Photo
Or this one: Photo
I think the one you have is a diamondback watersnake. Can't be certain with out closer inspection.
BR