paulj wrote:
I15 Monida Pass doesn't have any unusually steep section. As for snow and cold, wouldn't conditions be similar to Edmonton - higher, yes, but also further south.
There is a 'valley' around around I15 in the Butte area. But if it is storming, I'd prefer to stick with the Interstate.
This 'valley' allows you to stay East of the Continental Divide and avoid crossing it two more times as you do if you go through Butte on I-15. Assuming this is what you had in mind, paulj, on North I-15, take Exit 63 at Dillon and go North on MT 41 to Twin Bridges. Turn left in Twin Bridges and stay on MT 41 North through Silver Star. There is an intersection about 2 miles north of Silver Star - MT 41 goes to the left and the straight road becomes MT 55. Stay straight on MT 55 and go to Whitehall. Avoid I-90 and drive straight through Whitehall - the road becomes MT 69. Stay on MT 69 as it goes by and under I-90. Turn left about one mile past the I-90 underpass where MT 2 splits off from MT 69 and rejoin I-15 in Boulder.
No mountain passes - good 2-lane road all the way.