12. South Fork of the Snake River — Idaho
The South Fork flows 66 miles through high mountain valleys, rugged canyons, and broad flood plains to its confluence. The South Fork supports the largest riparian cottonwood gallery forest in the West and is among the most unique and diverse ecosystems in Idaho. It is also home to 126 bird species, including 21 raptors. The river also supports the largest native cutthroat fishery outside of Yellowstone National Park. Other wildlife includes moose, deer, elk, mountain goats, mountain lions, black bears, bobcats, coyotes, river otter, beaver, fox, and mink.
Bureau of Land Management