I used to live in the bellingham area until I was about 12 and frequently went fly fishing on the methow river in central WA in a town called Winthrop. There was (and still is ) some Fish and game land out and around that area and it is LOADED with snakes. It was when I was a kid and was this summer when I went back,

The largest Yellowbellied I caught was along a cliffside overlooking the river. It meassured at 52" and was quite girthy for a racer and covered in scars.

If you are looking for some WC animals I would go there.

I'm not kidding you when I say this; there is a snake under EVERY rock and every 10' along the cliffside.

Some others I found included GB gopher/PAC gopher crosses and numberous rattlesnake species.