Good call! Especially when you're talking about my back yard!! (so to speak)
Oh... never let an old time english teacher see you call them the "sierras." The name Sierra-Nevada describes a range of mountains and there is only one Sierra-Nevada mountain range, or Sierra, for short.
I know, it's as picky as the San Franciscans insisting you must always call their city by it's full name, rather than just "Frisco," right?
I can get away with it. I'm a Niner fan!