Meeting friends in Mammoth Lakes in October but from riverside their are more "R" and "MOA's" then you can shake a stick at without hitting one or both. They cover both the valleys and mountains. So up Western side and drop down or follow the 395 with detours around areas not friendly to civilians. If western side then best crossover without oxygen. Come on you crazy skiers from SoCal, you know this is the awesume Mountain and I what to fly into to town.