AMP: 77 Location: I-90 and Petty Creek Rd, Missoula Cty Reassurance shield after the business loop rejoins and we head out of the Alberton area. AMP: 82 Location: I-90 and Big Horn Rd, Missoula Cty Reassurance shield a few miles later. AMP: 85 Location: I-90 and Huson Rd, Missoula Cty Reassurance shield after the Huson interchange as we … Continue reading Interstate 90, I-90 Bus/S-507 to S-263