Merced River in Yosemite National Park, California (© Robb Hirsch/Tandem Stills + Motion)

Merced River in Yosemite National Park, California (© Robb Hirsch/Tandem Stills + Motion)

Wild scene on the Merced River

Signed October 2, 1968, by President Lyndon B. Johnson, the Wild and Scenic Rivers Act preserves rivers with 'outstanding natural, cultural, and recreational values in a free-flowing condition for the enjoyment of present and future generations.' It covers 13,416 miles of streams and protects parts of such natural treasures as the Allagash, Salmon, Snake, Concord, Fortymile, Trinity, Missouri (the longest river in the US)—and the Merced River, which we're looking at here.

California's Merced makes its way through canyons, mountains, and foothills, flowing from the Sierra Nevada mountains, through the southern part of Yosemite National Park, into the San Joaquin Valley. Rafters enjoy the Class III and IV rapids, and visitors can camp at several sites along the river's course while also exploring the Merced River Trail.