AMP: 0 Location: US-20 at the Idaho Line, Gallatin Cty No reassurance shield as US 20 enters Montana. US 20 traverses the width of Montana’s tiny panhandle, and spends less time in Montana than it does in any other state. AMP: 9 Location: Firehole Ave and Electric St, W Yellowstone 9 miles later, we’ll enter … Continue reading U.S. Route 20, ID State Line to US-191/US-287