Monida Pass is a high mountain pass in the northern Rocky Mountains of the western United States, at an elevation of 6,870 feet (2,094 m) above sea level on Interstate 15, and 6,820 feet (2,079 m) on the Union Pacific Railroad.
On the Continental Divide in the Bitterroot Range, it marks the transition between the Beaverhead Mountains and the Centennial Mountains. Its name is derived from the states that it separates, "Mon" from Montana and "-ida" from Idaho.
The Centennial Mountains are the southernmost sub-range of the Bitterroot Range in the U.S. states of Idaho and Montana. The Centennial Mountains include the Western and Eastern Centennial Mountains. The range extends east from Monida Pass along the Continental Divide to Henrys Fork 48 km (30 mi) NNW of Ashton, Idaho; bounded on the west by Beaver Creek, on the north by Centennial Valley and Henrys Lake Mountains, on the east by Henrys Lake Flat, and on the south by Shotgun Valley and the Snake River Plain. The highest peak in the range is Mount Jefferson.
They are one of only a few ranges within the Rocky Mountains that trend west to east, and the Continental Divide runs along their ridge line.