AMP: 0 Location: S-340 and I-94, Prairie Cty No reassurance shield as S-340 begins. 340 will quickly head into unincorporated Fallon. AMP: 0 Location: Railway Ave and 2nd St, Fallon, Prairie Cty Welcome to Fallon! Fallon is unincorporated, despite having the “Entering” sign typical of incorporated communities. AMP: 7 Location: S-340 and Cabin Creek Rd, Prairie Cty A … Continue reading Montana Secondary Highway 340, I-94 to S-504