AMP: 71 Location: US-89 and US-87, Cascade Cty Reassurance shield after the US-87 split. AMP: 53 Location: US-89 and S-427, Cascade Cty 18 miles later, we’ll approach S-427. AMP: 53 Location: US-89 and S-427, Cascade Cty S-427 heads up to Raynesford, and is a nice shortcut from Lewistown to here. AMP: 53 Location: US-89 and S-427, Cascade Cty Turn … Continue reading U.S. Route 89, US-87/MT-3/MT-200 to S-427