AMP: 313 Location: I-15 and S-221, Teton Cty Reassurance shield after the Dutton interchange. AMP: 303 Location: I-15 and S-431, Teton Cty In a mile, exit for Secondary 431 AMP: 302 Location: I-15 and S-431, Teton Cty Exit for S-431, which heads to Power and then southwest towards Fairfield. S to US-89/MT-200, N to S-365 … Continue reading Interstate 15, S-221/S-379 to S-421