Originally Posted by scoutDad
I-15 between Butte and Helena, Montana would be the first on my list of favorite slab I have ridden. Very nice scenery and some nice sweepers.
Yep. Just rode this last fall. The 50 miles north of Helena is great, too. Would have preferred to take the twistier, slower, parallel Old US 91/Craig Frontage Rd, which sticks closer to the river bends, but didn't have the time that day.