What a great thread! Thanks also for the pictures.
I drive back every summer from Idaho to Omaha and the last 2 times have jumped off I90 in Kadoka, SD to drop down to Valentine and the state highways. (Too much construction in SD and IA) I always stop in Valentine to have my 1st - or last - Runza on my trip!
I agree that Montana is really pretty and the speed limit is nice as well. What did you think of the Battle of Little Bighorn Battle Field? I thought it was exceptionally well done and very sobering.
Idaho was beautiful as well. We drove north from Nevada to Twin Falls, a lovely community. Then north to Ketchum where we spent the night. The next day we drove through the Sawtooth National Forest. One of my favorite drives on the trip. I want to make the trek up to northern Idaho someday.
Little Bighorn Battlefield was very nice. Many were buried where they fell. A fitting tribute.