The St Regis River begins at Lookout Pass in which mountain pass on the Idaho/Montana border?
Lookout Pass Lookout Pass is a mountain pass in the Rocky Mountains of the northwestern United States. In the Coeur d'Alene Mountains of the Bitterroot Range, the pass is on the border between Idaho and Montana, traversed by Interstate 90 (formerly U.S. Route 10) at an elevation of 4710 ft above sea level.
Big Hole Pass Big Hole Pass (el. 7055 ft ) is a high mountain pass on the Montana Idaho border approximately 8 miles due south of Montana State Highway 43 in the Beaverhead-Deerlodge National Forest, Beaverhead County, Montana and Salmon National Forest, Lemhi County, Idaho. This location should not be confused with a sign on Montana Highway 278 at the height of land west of Dillon, Montana that denotes the eastern entrance to the Big Hole valley.