AMP: 0 Location: Dagmar N Rd and Reserve Hwy, Sheridan Cty Reassurance shield as S-516 begins. AMP: 5 Location: Dagmar N Rd and Longfellow Rd, Coalridge, Sheridan Cty A couple miles later, we’ll enter the tiny community of Coalridge. AMP: 6 Location: Dagmar N Rd and Coalridge Hwy, Sheridan Cty What. These MassDOT spec signs are common through … Continue reading Montana Secondary Highway 516, S-258 to S-517