At last night's meeting, John asked me where I found out the roads I was riding in Utah. One source ( a major one) is DangerousRoad.com, "the world's most spectacular roads." Here's the link to an overview of US roads:
http://www.dangerousroads.org/north-america/usa.html
It's a really useful resource, but don't always believe the Google maps that show the routes. Often the map shows the nearest highway instead of the road of interest.
I've been on a number of these roads, especially in Utah and Colorado. Some are more interesting than others, but I've enjoyed them all!