AMP: 0 Location: Grove St and Woodard Ave, Absarokee Reassurance shield as S-420 begins. 420 is a quick six mile spur to nowhere that isn’t signed because it’s cool to steal 420 signs. AMP: 6 Location: S-420 and Spring Creek Rd, Stillwater Cty Six miles later, S-420 ends with the pavement.  S to S-419, N to … Continue reading Montana Secondary Highway 420, US-212 to Spring Creek Rd