Mount Evans Scenic Byway:
The route begins at Idaho Springs, where it heads southwest away from the center of the city and follows the Chicago Creek. After exiting the city, the route begins climbing in elevation, ultimately reaching an elevation of about 10,000 feet, where it meets State Highway 5, at Echo Lake Park. Together with Highway 5, the route to this point forms the Mount Evans Scenic Byway, the highest paved road in North America. Then the route continues through Squaw Pass, along the upper end of Echo Mountain Ski Area and on to its terminus at County Route 151. Past this point, the highway is not marked by CDOT, but the rest of what is called Squaw Pass Road descends toward Evergreen
CO 103 combined with CO HWY 5 forms the Mount Evans Scenic Byway which includes the highest paved road in the US.
The ride is not far from Denver and connects to I-70 so it tends to get crowded on weekends and holidays.
The Echo Lake Lodge is a good pit stop with good food.