1995 Map of Sourdough Peak

About this map

Sourdough Peak and Baking Powder Mountain anchor this high-elevation landscape in north-central Idaho, where the intersection of multiple administrative boundaries defines the land use. The map captures a moment in the mid-1990s when the Frank Church River of No Return Wilderness, Gospel Hump Wilderness, and Nez Perce National Forest converge. This jurisdictional meeting point is reflected in the presence of four different ranger districts, including Santiam Ranger District and Clearwater Ranger District. The terrain is deeply incised by a complex drainage network featuring West Fork Twentymile Creek, Sourdough Creek, and Johns Creek. High-country water features like Moores Lake and Twin Lakes are situated among prominent landforms such as Bull Elk Ridge and Blue Ridge, illustrating the primitive character of this protected wilderness area before modern shifts in forest management.