Looks like a cotton mouth very common to my area. I can’t identify all snakes but know the shape of the head reveals whether its venomous with a few exceptions for example coral snakes.
Awhile back I was helping a church member clear some land for his home and we seen 3 cotton mouths in a small ditch on the property. I shot one in half and when I shot at the next one it jumped across the ditch and proceeded towards me. They’re one of the more aggressive snakes especially when in water.