AMP: 0 Location: S-431 and US-89, Teton Cty Reassurance shield as S-431 begins. AMP: 7 Location: S-431 and 2nd Rd NE, Teton Cty Reassurance shield about halfway through the route. AMP: 17 Location: S-431 and 13th Ln NE, Power, Teton Cty A few miles later, we’ll enter unincorporated Power. AMP: 19 Location: S-431 and I-15, Teton Cty As we … Continue reading Montana Secondary Highway 431, US-89/S-565 to I-15