I would like to take the paved back roads from Yellowstone to Portland. Do you have any suggested routes?
Yes. Lolo Pass. It's 199 miles of sweepers along the river. Very fun route. Get gas in Missoula, and get gas at the next station you see. It will be expensive, but when you need gas, you pay what it costs.Highway 12 from Missoula MT, to Clarkston, WA is a great ride and should be reasonably on the way if you want to work it in. (think it's called Lobo pass)