AMP: 31 Location: MT-1 and MT-38, Granite Cty No reassurance shield after the 38 junction. AMP: 38 Location: MT-1 and Rock Creek Rd, Granite Cty Just after the turnoff into Philipsburg, which is located off the highway, we’ll approach S-348. AMP: 38 Location: MT-1 and Rock Creek Rd, Granite Cty 348 is a 14 mile … Continue reading Montana Highway 1, MT-38 to S-348