This is a redbelly watersnake, Nerodia erythrogaster erythrogaster, observed on the Valdosta State University campus in south Georgia. A small creek runs westward through campus. This creak has a decent population of Nerodias (mainly N. e. erythrogaster and N. f. fasciata, from what I've seen), frogs (mainly bronze frogs and perhaps bullfrogs), some turtles (red bellies and yellow bellies), and little fishies/crayfish. It's a fantastic little creek!
~ janson jones,
http://dusttracks.com
The Plain-bellied Water Snake (Nerodia erythrogaster) is a common species of mostly aquatic, non-venomous, colubrid snake found in the United States.