 The United States Congress designated the area Wilderness in 1984.The ridges in the Salmon–Huckleberry Wilderness belong to the Western Cascades (Old Cascades), a broad volcanic mountain range that erupted 10 million years before the High Cascades.Devils Peak and Salmon Butte are likely remnants of once-tall volcanoes, but have been reduced to ridges by the millennia of ice and water erosion.