AMP: 15 Location: S-451 and S-463, Big Horn Cty Reassurance shield after the 463 junction AMP: 0 Location: S-451 and Frontage Rd, Big Horn Cty A few miles later, we’ll approach I-90. Turn right for I-90. AMP: 0 Location: S-451 and I-90, Big Horn Cty Follow I-90 east and unmarked US 87 south to Sheridan, Wyo. AMP: 0 Location: … Continue reading Montana Secondary Highway 451, S-463 to I-90/US-87