The I-90 interstate runs approximately along the route of the original Oregon Trail.
It’s pretty weird to imagine the wagons moving west on this vast expanse. There’s a certain small degree of modern infrastructure along the path of the interstate, but one of the wild things is that you can see huge distances to the horizon in every direction. Between the black hills and the Montana state line is about 500 miles. It’s around the same distance as the trip we did across Labrador earlier in the summer. It’s nearly just as empty, but not as deserted.
Finally, the interstate (I-25/90) turns along the path of Bozeman Trail. After the pass, you finally see Bozeman, MT.
We were in Bozeman in 2014, it’s really growing (and sprawling) fast. But it remains one of the coolest mountain towns.