Damn going right out in to it then, huh?
I'd take a roll of thin plastic. Fairly light and can come in very handy, especially if you're dealing with precipitation and wet gear.
I used to live in Clackamas Co. Went backpacking out in the Cascades a couple of times.
Being a WV native, camping was routine, but the backpacking into the mountains for days at a time was a new experience. Quite the adventure.
Good luck out there. Post pics