in the early 1980s. The volume not cut in the early 1980s was resold in the latter half of the decade. The "section 318" bill passed by the U.S. Congress increased the volume sold on the Willamette in 1990 to nearly of timber. After that, timber sale volumes declined rapidly. The Willamette National Forest Land Management Plan was approved in 1990. The plan was amended in 1993 by the Northwest Forest Plan (also called the President's Plan). In 1997, the Willamette's planned sale volume was . Wilderness About one fifth, or , of the Willamette National Forest is designated as wilderness area, some of which conserve its old-growth forests: Diamond Peak Wilderness at is mostly located within the Deschutes National Forest Middle Santiam Wilderness at Menagerie Wilderness at Mount Jefferson Wilderness at is partially located within the Mount Hood and Deschutes National Forests Mount Washington Wilderness at is partially located within the Deschutes National Forest Opal Creek Wilderness at Three Sisters Wilderness at is partially located within the Deschutes National Forest Waldo Lake Wilderness at See also Camp Pioneer References External links Official website History of the Willamette National Forest National Forests of Oregon Cascade Range Willamette River Protected areas of Lane County, Oregon Protected areas of Linn County, Oregon Protected areas of Marion County, Oregon Protected areas of Douglas County, Oregon Protected areas of Clackamas County, Oregon Protected areas of Jefferson County, Oregon 1933 establishments in Oregon