Centennial Mountains 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 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. Centennial Mountains The Centennial Mountains are the southernmost sub-range of the Bitterroot Range in the United States states of Idaho and Montana. The Centennial Mountains include the Western and Eastern Centennial
Names Hill as early as 1822 as mountain men crossed the river on their way to the beaver streams of the Western Rocky Mountains. In 1844, Caleb Greenwood and Isaac Hitchcock lead the first wagon train over what would later be called the Sublette-Greenwood Cutoff, along the way crossing the Green River at Names Hill. The wagon trains would rest at the Green River following a waterless trek across the prairie, providing an opportunity for travelers to add their names to the hill. Among the more famous names inscribed on the rock is famed mountain man Jim Bridger. Some have disputed the