AMP: 12 Location: S-400 and Straw Rd, Judith Basin Cty No reassurance shield as S-400 randomly begins along a dirt road that continues south from here. AMP: 5 Location: S-400 and Blackbull Rd, Judith Basin Cty Seven miles later, pavement begins. AMP: 4 Location: S-400 and Southwind Rd, Judith Basin Cty Reassurance shield after the turnoff to Ackley … Continue reading Montana Secondary Highway 400, Straw Rd to S-239