2017 Map of Massacre Mountain

About this map

Massacre Mountain and the high summits of the Last River Range dominate this high-altitude landscape within the Challis National Forest. The map detail reveals a complex network of alpine hydrology, where Auger Lakes and Shadow Lakes sit tucked beneath soaring ridgelines like Castle Peak. This 2017 survey documents the modern drainage patterns of the region, including the headwaters of Dry Creek and Long Lost Creek, as well as the seasonal flow through Hell Canyon. The terrain is marked by remote forest service routes like the Big Creek-Massacre road and the Swauger Lake Spur 1, reflecting a wilderness area managed for conservation and limited backcountry access. The presence of Nolan Lake and several branches of Wet Creek highlights the importance of snowmelt-driven water sources in this part of Idaho's Custer County.