This cache is not at the posted coordinates; you must solve the puzzle below to be able to find it.
Montana has hundreds of highways, some combined, some lost to time, and some many miles from a gas station. While I can hardly say I've travelled them all, I have travelled my fair share, and I thought it would be fun to make a puzzle using highway numbers. For each letter in the solution, I've included a set of coordinates corresponding to an MT highway, as well as which digit you need from that highway number. I have personally travelled on all the highways used in the puzzle. Good luck!
Final coordinates: N 46° 30.ABC' W 111° 42.DEF'
A = N 46° 02.443 W 111° 52.874, second digit
B = N 47° 23.081 W 110° 56.288, second digit
C = N 47° 52.069 W 104° 07.851, third digit
D = N 48° 31.034 W 115° 15.191, first digit
E = N 48° 27.632 W 109° 42.813, third digit
F = N 45° 18.659 W 109° 24.265, first digit
Parking near the hide is usually ploughed in the winter time, but the topography makes it so the snow is probably deeper than it looks, so please be careful if searching in the winter.
Congratulations to Chufra for getting the FTF!