Pioneer Mountain, Sawtooth National Forest

Pioneer Mountain at 10,525 feet high is a peak in the Pioneer Mountains on the border of Blaine and Custer counties in Idaho. The peak is also located on the border of Sawtooth and Salmon-Challis National Forests. The isolation of Pioneer Mountain is 1.47 miles. The southern and western slopes of the peak are drained by tributaries of Muldoon Creek, which as a tributary of the Little Wood River. The northern and eastern slopes are drained by tributaries of Star Hope Creek, which is a tributary of the Big Lost River. ()