AMP: 43 Location: Montana Ave and Boulder Ave, Helena Reassurance shield after the turn AMP: 44 Location: Montana Ave and 11th Ave, Helena A couple blocks later, turn left to continue east to I-15. Stay straight for the Capitol. AMP: 44 Location: Montana Ave and 11th Ave, Helena Turn left for US 12 east to US … Continue reading Interstate 15 Business, S-229 to I-15/US-12/US-287