Its a rattlesnake and in the right place to be an Eastern Timber Rattlesnake. By my best guess, its a female and most likely laden with young ones soon to be born. It could be we are relatively late in the year for new ones to be born, but the time varies with geography and yearly weather patterns. Thanks for giving her (him) the pass. I've only seen a couple so far this year and they were both victims of previous traffic. Tom