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Abstract

The Doublespring Pass road site is an excellent location at which to examine the surface faulting and ground breakage that accompanied the 1983 Borah Peak earthquake. The site can be reached by traveling 23 mi (37 km) northwest from Mackay, Idaho, or 30 mi (48 km) southeast from Challis, Idaho (Fig. 1), on U.S. 93 to the Doublespring Pass road turnoff. The Doublespring Pass road heads northeast from the highway. The intersectionof the Doublespring Pass road with the highway is identified by a sign indicating the direction to the towns of May and Patterson. The turnoff is also identified at the intersection by a historical marker commemorating William E. Borah, after whom Borah Peak was named. The Doublespring Pass road crosses thefault scarps 2.5 mi (4 km) northeast of the intersection of U.S. 93 (Fig. 2).

Doublespring Pass road is a wide, well-maintained gravel road that can be safely traveled by passenger car and bus to the site (although the road is impassable at times in the winter and early spring when snow covers the area). The site lies within Challis National Forest and is open to the public.

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