Yes, for a mini hot springs tour!
Thanks AZ Buck! Taking US 12 from near Missoula into Idaho is a great idea (but be sure to spend a night or a day in the Garden City of Missoula). The commercially developed Lolo Hot Springs are on US 12 near the state line. Not far down into Idaho, and with more effort required to reach, lie Weir Creek HS and Jerry Johnson HS, each a walk-in off of US 12. I recall one is about a 45 minute walk and the other somewhat less. Whatever the exact situation, each is a natural undeveloped hot spring adjacent to a cold mountain stream. Some hot springing enthusiasts I know from Challis, ID are quite enthused about each of the walk-ins.
Foy