AMP: 24 Location: S-221 and I-15, Teton Cty Reassurance shield as S-221 begins. AMP: 24 Location: Main St and 3rd Ave, Dutton Just after 221 begins, we’ll enter Dutton. AMP: 23 Location: Main St and 3rd Ave W, Dutton As we head through Dutton, turn left to stay on 221 west towards Choteau. AMP: 23 Location: 3rd Ave W … Continue reading Montana Secondary Highway 221, I-15/S-379 to S-220