AMP: 128 Location: I-15 and Harrison Ave, Butte As 15 and 90 join, their twin business loops will prepare to split to head into Butte. AMP: 127 Location: I-15 and Harrison Ave, Butte Exit for I-15 and I-90 Business, which head over to uptown Butte and join I-15/I-90 again in a few miles. Montana 2 … Continue reading Interstate 15, I-90 to I-15 Bus/I-90 Bus/MT-2