Jefferson National Forest in Montana was established by the U.S. Forest Service on July 1, 1908 with 1,255,320 acres (5,080.1 km2) from the consolidation of Little Belt, Highwood Mountains, Snowy Mountains and Little Rockies National Forests. On April 8, 1932 the entire forest was transferred to Lewis and Clark National Forest, the name surviving as the Jefferson Division of Lewis and Clark.