2017 Map of Challis Creek Lakes

About this map

The Challis National Forest dominates this high-altitude landscape in central Idaho, where the county line between Lemhi and Custer counties follows the rugged drainage divides. This 2017 survey details a complex hydrologic network centered around the Challis Creek Lakes, which feed into Challis Creek. The terrain is defined by dramatic elevation changes, notably at Parker Mountain, where numerous seasonal and perennial streams like Spider Creek and Parker Creek originate. To the south, the Yankee Fork of the Salmon River flows through the canyon, joined by Twelvemile Creek. The map provides a clear look at the backcountry access routes, including the East Mayfield - Yankee Fork road, illustrating how the geography dictated transport through these mountain passes.