From my backyard the accuracy of those maps are laughable.  There is a red line running north and south in colorado that is the continental divide.  Pretty sure you could find areas in that red that still has 50ft of drifted snow.  Almost all dirt roads that were not maintained over the winter that are above 8000ft are still impassable from snow.  Things should start opening up here in the next two weeks and hopefully 90% open by the 4th.  Interested to know what kind of sensors they are using to screw up that bad.