Interstate 90 1-1 Pictures Clarks Fork Bridge (2001-09-22) This span of I 90 crosses the Cross Forks. 1-1 Pictures Context: On the Road Interstate 15 (88 pictures) Interstate 90 intersects I 15 near Butte. Most the I15 traffic heads west towards Missoula. I15 jags east then north to Canada. Missoula, Montana (62 pictures) Missoula is on Interstate 90 in Western Montana.