AMP: 1 Location: Cedar St and I-15, Helena As I-15 Business begins, we’re told to stay straight on it for US 12 AMP: 1 Location: Cedar St and I-15, Helena The VA is also located on US 12 on the west side of town AMP: 1 Location: Cedar St and Montana Ave, Helena A few … Continue reading Interstate 15 Business, I-15/US-287 to S-229