ki7be, if you will go to this page (scroll all the way down) I think you will find a good lot of the frequencies that you are looking for. Southern Utah police/fire/EMS is not trunked - that I am aware of - so you will be dealing with VHF/UHF. I don't know if we have anyone who knows about the Ski Patrol or Operational Frequencies of the Brian Head Ski Resort. Most of us are way far north in the Wasatch Front (Provo/Salt Lake/Ogden) areas.
If you should happen to find out what the frequencies for the Ski Patrol and resort are while you are there, we would really appreciate having you post your findings here so we can get it in the Database for others who ask for the information.