AMP: 0 Location: S-489 and MT-59, Custer Cty Reassurance shield at the beginning of S-489. AMP: 9 Location: S-489 and Caprock Rd, Custer Cty Reassurance shield about halfway down the route. AMP: 18 Location: S-489 and Lower Rd, Custer Cty A few miles later, S-489 will end with the pavement. AMP: 18 Location: S-489 and Lower Rd, Custer Cty … Continue reading Montana Secondary Highway 489, MT-59 to Kinsey