From Ridgway, the byway turns south onto US 550 following the Uncompahgre River into the Victorian mining town of Ouray. The highway is referred to as the Million Dollar Highway from Ouray south back to Durango. For the first south of Ouray the byway follows through the Uncompahgre Gorge. Just past the only tunnel on the route, just south of Ouray, the road crosses over Bear Creek Falls on a bridge at the location of an impassable toll booth on the original road. The Alpine Loop National Back Country Byway, a four wheel drive jeep road, takes off in the gorge south of Bear Creek Falls. Before leaving the gorge the byway passes through a snow shed under the Riverside Slide avalanche zone. A monument stands near here honoring those who have lost their lives in the avalanche, including several snowplow operators. At this point the byway enters Ironton Park, a nice flat valley in contrast to the gorge. The road ascends several switchbacks, or S-curves, past the Idarado mining operation to the summit of Red Mountain Pass, providing views of Red Mountain and several ghost towns. Back into the San Juan National Forest the highway descends through the Chattanooga Valley to Silverton.