AMP: 0 Location: US-12 and US Highway 10, Powell Cty Reassurance shield after the Montana 88/Old 10/whatever it is junction as we head out of Garrison. AMP: 12 Location: US-12 and MT-141, Avon, Powell Cty A few miles later, we’ll pass by the community of Avon. AMP: 12 Location: US-12 and MT-141, Avon, Powell Cty … Continue reading U.S. Route 12, MT-88 to MT-141