AMP: 1 Location: Musselshell Rd and Pease Bottom Rd, Yellowstone Cty No reassurance shield after the 311 junction. AMP: 1 Location: Musselshell Rd and Pease Bottom Rd, Yellowstone Cty S-310 used to go to gravel just after S-311, but is now paved for a few more miles. AMP: 5 Location: Musselshell Rd and Allen Creek Rd, Yellowstone Cty … Continue reading Montana Secondary Highway 310, S-311 to US-12