From Montrose to Durango, best section is between Ouray and about 15mi out of Durango. Red Mountain pass was my favorite but there are atleast 3 passes to choose from. Best road i have been on, lots of switch backs, elevation change, high/low speed corners not to mention the views and huge drops off the side... don't screw up. I imagine in the summer traffic could be an issue with the scenery/tourists but not right now. Give it a shot if ur down in the area you'll be happy you re-routed the road trip.