I was hiking in Southern Indiana, near Kentucky, and found these three specimens.

The first here i'm pretty certain is an eastern garter.
http://i63.photobucket.com/albums/h154/justinmc1116/HPIM0289.jpg

the second is a Midland water snake if I'm correct
http://i63.photobucket.com/albums/h154/justinmc1116/HPIM0315.jpg

but I'm unclear of the third. Is it an eastern garter as well? Its fatter, and seem to be flat on its underside with more a triangular shaped head.
http://i63.photobucket.com/albums/h154/justinmc1116/HPIM0315.jpg