AMP: 21 Location: US-87 and 3rd St, Judith Basin Cty Reassurance shield after the S-551 junction. AMP: 21 Location: US-87 and 3rd St, Judith Basin Cty 22 miles to junction US-89. AMP: 10 Location: US-87 and S-427, Judith Basin Cty A few miles later, we’ll approach S-427. AMP: 10 Location: US-87 and S-427, Judith Basin Cty Follow 427 south … Continue reading Montana Highway 200, S-551 to S-427