AMP: 0 Location: S-387 and US-87, Chouteau Cty Reassurance shield as S-387 begins. 387 is the old alignment of US-87 into Fort Benton. AMP: 2 Location: S-387 and US-87, Chouteau Cty 387 is pretty short, and two miles later we’ll approach Montana 80. AMP: 2 Location: S-387 and MT-80, Chouteau Cty Turn left for MT-80 south into town, … Continue reading Montana Secondary Highway 387, US-87 to MT-80