Geophysical survey of the Centennial Mountains Wilderness Study Area and contiguous areas, Beaverhead County, Montana and Clark and Fremont counties, Idaho

Parts of both the Targhee and Beaverhead National Forests are within the study area. Four contiguous parcels of land, totaling about 96,176 acres (38,922 ha) make up the area. The first of these encompasses about 46,126 acres (18,667 ha), is wholly in Montana, and includes an addition by the Bureau of Land Management. The second area, in the Targhee National Forest, consists of some 38,750 acres (15,682 ha) within Idaho. The third and fourth parcels include about 11,300 acres (4,573 ha) in the Beaverhead..and Targhee National Forests that overlies the Mt. Jefferson and Sawtell Peak areas in the eastern part of the Centennial Mountains.