The St Regis River begins at Lookout Pass in which mountain pass on the Idaho/Montana border?
St. Regis River (Montana) The St. Regis River is an approximately 32.5 mi tributary of the Clark Fork of the Columbia River in Montana in the United States. It begins at Lookout Pass on the Idaho/Montana border, flows east and ends at the confluence with the Clark Fork in the city of St. Regis. Its drainage is 330 sqmi . The record high flow for the St. Regis River in Montana was recorded on May 19, 1954 at 11,000 cubic feet per second according to USGS gaging data.
South Pass (Wyoming) South Pass (elevation 7,412 feet (2,259 m) and 7,550 feet (2,300 m)) is the collective term for two mountain passes on the Continental Divide, in the Rocky Mountains in southwestern Wyoming. The passes are located in a broad low region, 35 miles (56 km) wide, between the Wind River Range to the north and the Oregon Buttes and Great Divide Basin to the south, in southwestern Fremont County, approximately 35 miles (56 km) SSW of Lander. South Pass is the lowest point on the Continental Divide between the Central and Southern Rocky Mountains. The passes furnish a natural crossing point of the Rockies. The historic pass became the route for emigrants on the Oregon, California, and Mormon trails to the West during the 19th century. It has been designated as a U.S. National Historic Landmark.