AMP: 87 Location: US-87 and Highwood Rd, Cascade Cty Reassurance shield after the S-227/228 junction. AMP: 90 Location: US-87 and 57th St, Cascade Cty As we enter Great Falls, we’ll get a reassurance shield after the turnoff to the Air Force Base, now noting the upcoming junction with I-15 on the other side of town. AMP: 91 Location: … Continue reading Montana Highway 200, S-227/S-228 to US-87