AMP: 122 Location: I-15 and Rocker Gulch Rd, Silver Bow Cty As we cross over S-276, we’re a mile from the I-15 and I-90 split. AMP: 121 Location: I-15 and I-90, Silver Bow Cty Dillon appears to be added onto these signs after the fact- perhaps they felt they should be a control city because … Continue reading Interstate 15, S-276 to I-90