Beautiful, green, hilly, empty (nobody home) -- the road from Arco, ID to Helena, MT was another spectacularly scenic road. There were many farms, and then we went up into the mountains. Travelling north on I15, we noticed that exit zero was for Monida (name made up from Montana and Idaho). The town is right on the state line.
We crossed a mountain pass at 6000 feet and noticed a warning sign and a pullout for putting on chains (hopefully only in winter).
For more pictures, click Road to Montana