I don't know of a listing for all of the passes, although many atlases and maps will show the major passes and elevations. If you find a list, please let us know.

I will say more importantly, when you are talking about a mid december trip, you'll have the potential to see snow virtually everywhere regardless of elevation. Certainly the plains and midwest get their share of snowfall in december.

For chains, consult your owners manual, however, as a general rule, chain go on the "drive wheels." If your car has All Wheel Drive, you will need to put chains on all 4 wheel. In fact, since because of how AWD systems work, putting them on just 2 wheels can cause some problems for the various systems that your car uses to know which wheels need power.