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 A continental divide is a drainage divide on a continent such that the drainage basin on one side of the divide feeds into one ocean or sea, and the basin on the other side either feeds into a different ocean or sea, or else is endorheic, not ...

to Henrys Fork NNW of Ashton, Idaho; bounded on the west by Beaver Creek, on the north by Centennial Valley and

Henrys Lake Mountains The Henrys Lake Mountains, highest point Sheep Point, el. , (See also ) are a small mountain range northwest of West Yellowstone, Montana, in Madison County, Montana. These mountains are also referred to as the Lionhead Mountains, and straddle ...

, on the east by Henrys Lake Flat, and on the south by Shotgun Valley and the

Snake River The Snake River is a major river of the greater Pacific Northwest region in the United States. At long, it is the largest tributary of the Columbia River, in turn, the largest North American river that empties into the Pacific Ocean. The Snake ...

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. The Western Centennial Mountains extends west from the Eastern Centennial Mountains along the Continental Divide to Monida Pass, 25 mi NE of Dubois, Idaho; Snake River Plain, on the north by Centennial Valley, and the east by a line connecting Odell Creek and an unnamed tributary, in Montana, to Ching Creek in Idaho. About 100,000 acres of the Centennials are roadless. This includes National Forest lands, the Bureau of Land Management's Centennial Mountains Primitive Area, a portion of Red Rock Lakes National Wildlife Refuge, state and private land, and part of a USDA Agricultural Research Station for sheep. Around 326 vascular plant species have been identified in the Centennials, an unusual plant diversity for the Yellowstone region.

Grizzly bears The grizzly bear (''Ursus arctos horribilis''), also known as the North American brown bear or simply grizzly, is a population or subspecies of the brown bear inhabiting North America. In addition to the mainland grizzly (''Ursus arctos horri ...

inhabit the area, as nearly all species indigenous to the Greater Yellowstone Ecosystem are present. The north slope of the Centennials rises abruptly 3,000 feet above the Centennial Valley.

Notes

{{Authority control Bitterroot Range Mountain ranges of Idaho Mountain ranges of Montana Landforms of Clark County, Idaho Landforms of Fremont County, Idaho Ranges of the Rocky Mountains