Centennial Mountains Wilderness Study Area, managed by the Bureau of Land Management along the intersection of southwest Montana and Idaho. Not only are its slopes a source of clean water, but the Centennial represents a crucial corridor for wildlife moving between Greater Yellowstone and other ecosystems to the north.  Its natural values are high because intense human uses have not fragmented the landscape. Photo courtesy Bob Wick/BLM
Centennial Mountains Wilderness Study Area, managed by the Bureau of Land Management along the intersection of southwest Montana and Idaho. Not only are its slopes a source of clean water, but the Centennial represents a crucial corridor for wildlife moving between Greater Yellowstone and other ecosystems to the north. Its natural values are high because intense human uses have not fragmented the landscape. Photo courtesy Bob Wick/BLM