Stretch:
This one looks the closet to what you've got to me:
The plain-bellied Watersnake
http://www.herpsofarkansas.com/Snake/Nerod...me=2C3V6907.jpg
Description:
"The general coloration of the Plain-bellied Watersnake can be brown, green, or gray. In Arkansas, the belly color is a plain yellow or cream. Like other nonvenomous watersnakes, it has several dark, vertical lines that outline the upper lip scales. The scales are strongly keeled and the anal plate is divided.
Two subspecies, the Yellow-bellied Watersnake (N. e. flavigaster) and Blotched Watersnake (N. e. transversa), occur in the state. Adults of the Yellow-bellied subspecies usually have a plain-colored back, whereas adults of the Blotched subspecies usually retain more of a juvenile patterning into adulthood. Patterned adults have a series of faint, light colored crossbars bordered in black that run along the backbone. The intergrade zone between these two subspecies in Arkansas is not clearly established.
This species can be found living concurrently with other species of watersnakes in and around lakes, ponds, streams, rivers, and drainage ditches. It seems to be more at home in still waters. Due to its behavior, it prefers trees along the edges of waters."
I also checked out the Graham's Crayfish snake but it doesn't have the dark lines radiating down from the eye.