AMP: 29 Location: S-294 and US-12, Meagher Cty Reassurance shield as S-294 begins. AMP: 29 Location: S-294 and US-12, Meagher Cty 29 miles to junction US-89. This route is actually faster than US 12 to get from Harlowton to Helena. AMP: 27 Location: S-294 and Grant Ave, Meagher Cty On the west edge of Martinsdale, S-294 will turn … Continue reading Montana Secondary Highway 294, US-12 to US-89