Chelan National Forest was established in Washington by the U.S. Forest Service on July 1, 1908 with 2,492,500 acres (10,087 km²) from a portion of Washington National Forest. On July 1, 1921 it absorbed the first Okanogan National Forest, but on March 23, 1955 the name was changed back to Okanogan.^[1]

• Forest History Society
• Forest History Society:Listing of the National Forests of the United States Text from Davis, Richard C., ed. Encyclopedia of American Forest and Conservation History. New York: Macmillan Publishing Company for the Forest History Society, 1983. Vol. II, pp. 743-788.

48°40′N 120°00′W / 48.667°N 120.000°W / 48.667; -120.000