A couple of years ago my wife and I were touring the PNW..Montana, Idaho, Washington, Oregon and Wyoming. Our stop for one of the nights was in Lewiston, Idaho and running out of Lewiston is a road 129 in Washington and 3 in Oregon. This road had a famous name like the Dragon etc and it was called 'Rattlesnake Grade". It ran along the snake river and was quite devilish for awhile. From the town of Asotin (I suggest you get gas there, there isn't another station for about 80 miles) you go up a spiral winding hill, then a flat piece, then the Rattlesnake grade, then another flat piece, but the Rattlesnake Grade part is pretty cool. Here's a video of it (not mine). Thought you might enjoy. If out that way, it's worth the trip, road is great and scenery is awesome
https://www.youtube.com/watch?v=IHkhbE7Ic28