It's a long haul for you, but when I was at WSU we used to hunt them along the breaks of the Snake near Wawaii. We hiked along the river on the train tracks and hunted up and down the draws. Had good success. Bring good boots and cardio conditioning, as well as strong legs, because it's steep and rough. Also rattle snakes in the early season, so be careful with your dog, if you have one.