AMP: o Location: Old Hwy 312 and I-94, Treasure Cty No reassurance shield as S-311 begins. 311 follows old US-312 between Hysham and Custer. AMP: 2 Location: Buford St and 7th Ave, Hysham A couple miles later, we’ll enter Hysham. 311 follows the east side of town. AMP: 2 Location: Buford St and Hwy 312, Hysham On the … Continue reading Montana Secondary Highway 311, I-94 to S-310