Chief Joseph Pass el. 7,251 feet (2,210 m) is a mountain pass on the continental divide of the Rocky Mountains in the northwestern United States. It separates Lemhi County, Idaho and Beaverhead County, Montana. The pass is in the Bitterroot Mountains and is traversed by Montana State Highway 43. The pass is named after Chief Joseph of the Wallowa band of the Nez Perce tribe who traversed the pass in 1877 during the Nez Perce War. The Lost Trail Powder Mountain ski area is about 1-mile (1.6 km) west, at Lost Trail Pass on US-93.