Near here, the Keystone Road split from the Toll Road, and teamsters and supplies bound for the Bayhorse Mining District followed it to Bayhorse, Crystal, and Clayton. In 1889, the Salmon River Road between Clayton and the Yankee Fork replaced the Keystone Road. Bayhorse became one of Idaho's richest mining districts, but its harsh terrain, dramatic elevation change, and difficult winters meant that only the most determined and hardy prospectors could mine there. The route later provided a supply trail from Challis to the mining camps and towns of the Yankee Fork Mining District and, after the Toll Road was completed in 1879, served for ten years as the area's only freight wagon and stage access. Reconstruction and realignment by the Civilian Conservation Corps in 1933 opened the road to motorized traffic. Today, the Land of the Yankee Fork Historic Area preserves this frontier mining heritage, its historic sites, and the route now followed by the Custer Motorway Adventure Road.