AMP: 18
Location: S-421 and US-212, Carbon Cty
No reassurance shield as 421 begins.
AMP: 8
Location: S-421 at the Carbon County Line, Stillwater Cty
Reassurance shield about halfway down the route as we enter Stillwater County.
AMP: 0
Location: S-421 and MT-78, Carbon Cty
A few miles later, we’ll approach Highway 78.
AMP: 0
Location: S-421 and MT-78, Stillwater Cty
Turn right for 78 west into Columbus and left for 78 east towards Red Lodge.
