1987 Map of Powderhorn Gulch

About this map

Salmon National Forest dominates the eastern high ground of this Lemhi County landscape, where the terrain drops sharply toward the drainage basins of the west. A network of alpine waterways including Powderhorn Gulch, Tenmile Creek, and Clear Creek carve through the slopes, eventually feeding into the larger valley floor. The presence of several prospects near Tenmile Creek indicates the area's legacy of mineral exploration within the mountainous interior. In the southwestern corner, Eighteenmile Creek follows the base of Center Ridge, while the topographic Divide marks the natural boundary between watersheds. This 1980s-era provisional survey captures a remote wilderness interface defined by its water resources and complex elevation changes, illustrating the transition from protected forest land to the expansive ranching and mining country of central Idaho.