I'm assuming that is water, maybe some kind of blotched water snake.
Killed a good sized copperhead, chased a pretty big Texas rat snake out of the yard (he "rattled" his tail when I escorted him out of the flower bed with a hoe), saw some kind of green/yellowish kind of coachwhip snake, and killed two more sizable (18"+) copperheads. It's the year of the snake.
[This message has been edited by SWCBonfire (edited 6/1/2014 8:22p).]