AMP: 0 Location: S-457 and I-90, Big Horn Cty No reassurance shield as 457 begins. 457 is a very short connector over to S-451/old US-87. AMP:  1 Location: S-457 and S-451, Big Horn Cty A mile later, we’ll approach S-451. AMP: 1 Location: S-457 and S-451, Big Horn Cty Follow 451 south to Wyola. AMP: 1 Location: S-457 … Continue reading Montana Secondary Highway 457, I-90/US-87 to S-451