If you've never heard of "The Happy Camp Highway", Highway #96, you've not ridden a true mountain road. Basically east west, from Interstate 5 @ Yreka, CA, to Willow Creek, CA.
Then again, "The Leggatt Express", where Highway 1 and 101 split off, this extremely challenging section takers you out to the coast. Serious road.
And, here's hoping Windy Ridge opens up again on the east side of Mt. St. Helens, truly the best road in North America.