AMP: 0 Location: S-446 and Frontage Rd, Rosebud Cty Just after exiting I-94, 446 will turn east onto old US 10/12 AMP: 0 Location: Frontage Rd and S-446, Rosebud Cty Less than a mile later, 446 will turn to head north AMP: 2 Location: S-446 and Cartersville Rd, Rosebud Cty We’ll head north a couple miles, and then … Continue reading Montana Secondary Highway 446, I-94/US-12/S-447 to Cartersville Rd