AMP: 146 Location: US-12 and MT-3, Golden Valley Cty Reassurance shield after the 3 split. AMP: 162 Location: US-12 and S-381, Musselshell Cty Several miles later, we’ll approach S-381. AMP: 162 Location: US-12 and S-381, Musselshell Cty Turn left for S-381, which is a 16 mile spur to nowhere. E to US-87, W to S-238/S-300 … Continue reading U.S. Route 12, MT-3 to S-381