AMP: 0 Location: US-12 and I-90, Garrison, Powell Cty Reassurance shield as US-12 splits from I-90. AMP: 0 Location: US-12 and US Highway 10, Powell Cty As we head out of Garrison, we’ll approach the old US 10 split. Turn right for old 10 east towards Butte. Stay on 12 for Helena. AMP: 0 Location: US-12 and US … Continue reading U.S. Route 12, I-90 to MT-88