Might be a good idea to recognize a Cotton Mouth

[Trail Bug]

Looks like a

Northern water snake.

[Spokes]

Looks like a

Northern water snake.

My guess would also be the Northern water snake. What amazes me is the variety of color variation. Look at all the different shades of the snake at this wiki link

http://en.wikipedia.org/wiki/Northern_Water_Snake

The article says they are often misidentified as cottonmouths.