It is a garter/ribbon snake of some kind nothing to worry about.
It amazes me everytime I read these comments on these forums with all of these "hunters" Afraid of snakes. I just don't get it.
I have worked with reptiles since I was a kid and don't think that there are a handfull that actually scare me. 15 foot King cobra, Black mamba, Boomslang, I am sure some Austrailain species as well. These don't even scare me just deserve some more respect.
Me personaly I don't think you should kill what you won't eat or at least utilize ie. skins.
Fear is an amazing thing as how people react.
Just my 2cents.