How much of a hurry are you in? Try taking the southern route across Colorado. Assuming you approach from the south, at Walsenburg take 160 to Durango. The road is full of mountain twisty turny fun to drive roads. The drive down from Wolf Creek Pass from east to west is one of the most beautiful landscapes you'll ever see, and it's switchbacks all the way. Then go north towards Grand Junction. Plan a stay in Gateway to stop at the Gateway museum (Hencricks of the Discovery channel museum) and a world class hotel and restaurant. You should be able to make it to Salt lake the next day.