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
Howell Mountains such as the Howell Mountains and Mt. George Range that have more northerly derivations have become more popular. The fact that none of these names are recognized by the United States Geographical Survey means that the range has no official designation. Howell Mountain is named after John Howell, who, with a partner in 1856, opened at St. Helena the first blacksmith shop in Napa County. Howell Mountains was ultimately applied as well to the peaks to the south that separate Napa Valley from Suisun Valley. For example, Kunkel and Upson (1960) identify the Howell Mountains in their report on the