US 20 north from Idaho Falls
Folks, I am planning a trip for early fall that would take me north on US 20 from Idaho Falls to 287 north, then US 12 east, then US 89 north, ending up in central Montana. I will be in a 35' gasser ...
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Unless you want to see more mountain passes between Townsend and Lewistown, once you are at I-90, I would stay on it east to Big Timber, then take US 191 North. It's flatter and still has great views.
