AMP: 1 Location: S-359 and I-90, Jefferson Cty Just after Montana 2 joins Secondary 359, we’ll approach I-90. Turn right for I-90 east to Billings. AMP: 1 Location: S-359 and I-90, Jefferson Cty Follow I-90 west to Butte and S-359/MT-2 to MT-69, which heads to Boulder. AMP: 1 Location: S-359 and I-90, Jefferson Cty Turn … Continue reading Montana Highway 2, S-359 to I-90