AMP: 498 Location: I-90 and Third St, Big Horn Cty Reassurance shield as the business loop rejoins AMP: 503 Location: I-90 and River Rd, Big Horn Cty Reassurance shield a few miles later. AMP: 508 Location: I-90 and US 212, Big Horn Cty 2 miles to the US 212 split. AMP: 509 Location: I-90 and … Continue reading U.S. Route 87, I-90 Bus/MT-47 to US-212