There are several scenic pullouts along MT highways, but of all the ones I've seen I consider this one of my favorites. You can see a lot from this vantage point. They also always plough the pullout in the winter, so you can check out the view whenever you drive by. This one is relatively winter friendly, but it might be impossible to get to depending on the amount of snow (sometimes the rail gets buried in snow from ploughs).
A well-deserved congratulations to TheRoamingArmadillo for getting the FTF!