Grab anothet pic after you wipe the vasoline off the lens and take your Parkinsons meds, lol. If it has a triangular head then its most likely venomous. But some water snake mimic that.
The triangular head method is entirely inaccurate. With this bad of a picture, there is no way to tell for sure what it is. If I had to guess, it's a Nerodia sp.