AMP: 307 Location: US-20 and I-15, Idaho Falls At the exit, turn right for 20 east toward Rigby, Rexburg, and W. Yellowstone MT. AMP: 307 Location: US-20 and I-15, Idaho Falls Follow US 20 for a weird emergency I-15 detour through Rigby. AMP: 307 Location: US-20 and Lindsay Blvd, Idaho Falls Overhead reassurance shield as the expressway begins. … Continue reading U.S. Route 20, I-15 to US-20 Bus