Hell Gate National Forest was established as the Hell Gate Forest Reserve by the U.S. Forest Service in Montana on October 3, 1905 with 1,581,120 acres (6,398.6 km2). It became a National Forest on March 4, 1907. On July 1, 1908 the entire forest was divided between Beaverhead, Deerlodge, Missoula and Bitterroot National Forests and the name was discontinued.[1]