2019 Colville National Forest Land Management Plan. The area of contiguous Inventoried Roadless Areas and Wilderness is approximately 75,000 acres. See also List of U.S. wilderness areas Wilderness Act List of old growth forests References External links Salmo-Priest Wilderness U.S. Forest Service Wilderness areas of Washington (state) Old-growth forests Protected areas of Pend Oreille County, Washington Idaho Panhandle National Forest Protected areas established in 1984 1984 establishments in Washington (state)