The West Mountains are a mountain range in the U.S. state of Idaho, spanning part of Boise and Payette national forests. The highest point in the range is Snowbank Mountain at an elevation of 8,320 feet above sea level.

Lake Cascade, and is the fourth largest lake or reservoir in the Idaho. The closest cities are Cascade, Donnelly, and McCall, all in the Long Valley of Valley County. Following a delay due to World War II, the earthen dam was built by the Bureau of Reclamation, completed in 1948.