AMP: 13 Location: US-12 and MT-141, Powell Cty Reassurance shield after 141 as we head out of Avon AMP: 20 Location: US-12 and Burns St, Elliston, Powell Cty A few miles later, we’ll enter Elliston. AMP: 27 Location: US-12 at MacDonald Pass, Lewis and Clark Cty A few miles later, we’ll cross the Great Divide … Continue reading U.S. Route 12, MT-141 to S-356