roads I really like are the west sloop of Bighorn Mts on alt 14 in
Wyoming its very steep grade, very tight switch backs thou the road
surface is a little ruff, its still a blast to ride, traffic is usually
light cars and campers have trouble with overheating. At the top you are
near 10,000 feet .  other roads in the area are all so fun to ride.

 Bear tooth pass , highway 212 out of Red Lodge, Montana is a 30 mile
climb to the pass at close to 11,000 feet  with lots of tight turns, road
surface is good and traffic
can be heavy but was light the last time I was there in aug 98.  At the
top you can 
stop and go for a walk in the snow. part of the ride you will be above
the tree line and temps can be cool..

Off hwy 212 on to 296 all so in Wyiming is the chief Joseph hwy It is all
so a nice ride  lots of  twists and turns an a very good road surface,
traffic was light.

Don 581  in North Dakota