Sierra Club
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The Sierra Club is an American environmental organization with chapters in all 50 U.S. states, Washington D.C., and Puerto Rico. The club was founded in 1892, in San Francisco, by preservationist John
Theodore Roosevelt and John Muir in Yosemite National Park, c. 1906
Sierra Club members practicing a comedy skit for later social entertainment, c. 1948
Green River canyon trip at Dinosaur National Monument's Bull Park in 1953.
Nature hike at Point Lobos State Reserve in 1972.
Yosemite Decimal System
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The Yosemite Decimal System is a five-part grading system used for rating the difficulty of rock climbing routes in the United States and Canada. It was first devised by members of the Sierra Club in
Sierra Club
…and has historically been a notable organization for mountaineering and rock climbing in the United States. Members of the Sierra Club pioneered the Yosemite Decimal System of climbing, and were responsible for a substantial amount of the early development of climbing. Much of this activity occurred in the group's namesake…
The Knife Edge on Capitol Peak in Colorado is an example of a Class 4 climb
Emily Harrington on El Capitan in Yosemite, free climbing a 5.13a route