The following is excerpted from a National Park Service News Release dated 27 February 2003.

During the period 1947 to 1970, the Yosemite Valley region was an exceptionally important center of rock climbing activity. Activities and technological advancements and skills developed here made significant contributions at the regional, national and international level within the sport. World-renowned climbers such as Tom Frost, Royal Robbins, and Yvon Chouinard, were among the pioneers of this sport who developed equipment, techniques, and forged new routes in Yosemite, considered a mecca for rock climbers. They used Camp 4 as a base camp....

....Camp 4 remains significant in the context of modern mountaineering and rock climbing. "What makes this dusty little campground so historic and unique is its freewheeling, dynamic spirit and the people drawn to it over the decades. Camp 4's spirit epitomizes the spirit of the American West--restless, unconventional, inventive, and filled with hope...," said Linda McMillan, Vice President of the American Alpine Club.