Bitterroot Range, a northern range of the Rocky Mountains, on the Idaho-Montana border. It extends more than 700 miles (1,100 km) in a northwest-southeast direction. The higher peaks of the range are in the southern part, known also as the Beaverhead Mountains. Highest is Scott Peak (11,393 feet [3,473 m]). In the northern part of the range are the rich Coeur d'Alene mining district and the nation's largest stand of western white pine. Lolo and Lemhi passes, in the central and southern sections, were used by Lewis and Clark in their 1804–06 expedition. The mountains were named for the bitterroot plant, found throughout the area.