President Theodore Roosevelt originally designated the park as Mount Olympus National Monument on March 2, 1909.[6][7] The monument was re-designated a national park by Congress and President Franklin D. Roosevelt on June 29, 1938. In 1976, Olympic National Park was designated by UNESCO as an International Biosphere Reserve, and in 1981 as a World Heritage Site. In 1988, Congress designated 95 percent of the park (1,370 square miles (3,500 km2)) as the Olympic Wilderness,[8][9] which was renamed Daniel J. Evans Wilderness in honor of the late Governor and U.S. Senator Daniel J. Evans in 2017.[10] During his tenure in the Senate, Evans co-sponsored the 1988 bill that created the state's wilderness areas.[11] It is the largest wilderness area in Washington.
^National Geographic Guide to National Parks of the United States (7th ed.). Washington, DC: National Geographic Society. 2011. p. 402. ISBN9781426208690.