As predicted there have been lots of problems, though they will most certainly get the first load through eventually-
Snowy roads, traffic delay violations stall ConocoPhillips megaloads. By Kim Briggeman. Missoulian.
There is a rumor that future loads might be routed to use Interstate 90 and 15 which would present far fewer technical, congestion, and environmental problems. However, being an Interstate highway the loads would have to first be broken down to a much lower height because of the overpasses.