Description
Includes the Western and Eastern Centennial Mountains, highest elevation is Mount Jefferson, extends E from Monida Pass aong the Continental Divide to Henrys Fork 48 km (30 mi) NNW of Ashton, Idaho; bound on the W by Beaver Creek, on the N by Centennial Valley and Henrys Lake Mountains, on the E by Henrys Lake Flat, and on the S by Shotgun Valley and the Snake River Plain.