The Bitterroot Range is a mountain range and a subrange of the Rocky Mountains that runs along the border of Montana and Idaho in the northwestern United States. The range spans an area of 62,736 square kilometers (24,223 sq mi) and is named after the bitterroot (Lewisia rediviva), a small pink flower that is the state flower of Montana.
In 1805, the Corps of Discovery, led by Meriwether Lewis and William Clark and aided by the Shoshone Native American tribe, crossed the Bitterroot Range several times. Lewis first crossed the mountains at Lemhi Pass on August 12, then returned across the pass to meet Clark. The entire expedition then crossed the pass to the Salmon River valley, and the next month entered the Bitterroot Valley from the south via either Lost Trail Pass or Chief Joseph Pass. It then crossed Lolo Pass to the west.
Elevation: 11,393 ft (3,473 m)