Visit this link at the Idaho Parks and Recreation Website

Custer Motorway _ Salmon-Challis NF

The Custer Motorway features a great 40-mile historic tour of numerous mines and towns in the Yankee Fork, Custer and Bonanza areas, east of Stanley, Idaho, in the Salmon-Challis National Forest. Learn about the history as you encounter 17 interpretive sites between Sunbeam and Challis. The road is open to OHVs, but please watch out for and yield to full-sized vehicles on the one-lane dirt road. Start the ride either from Sunbeam and go up the Yankee Fork, or start in Challis and ride over to the Yankee Fork area. There are numerous areas where you could camp along the way. Bring plenty of food and water. No services. There are several natural hot springs pools near Sunbeam Dam.