AMP: 247 Location: US-85 and WYO 585, Weston Cty Reassurance shield after the WYO 585 junction as we leave the Four Corners area AMP: 256 Location: US-85 at the South Dakota Line, Weston Cty 9 miles later, we’ll enter South Dakota. The road gets worse. N to US-14A, S to US-16 N to I-90