Lolo Pass is a pass over the Bitterroot Mountains, on the Idaho/Montana border. The pass is at 5,233 feet of altitude. The Lolo area gets its name from a corruption of "Lawrence", the name of an early French trapper.
Long before European settlement, the pass was used by the Nez Perce people to the west to travel into Montana for annual buffalo hunts. It was also the route used by the Lewis and Clark Expedition on their outwards voyage. Through the early years of settlement of the area, the pass was mostly undeveloped, and it was not until the 1960s that the highway over the pass was completed. Even today, the pass is not a major route, and it is 133 miles between the two towns connected by the pass. It is, however, an important pass, because there is no all-weather route over the mountains for another 220 miles to the south.