Yes it is--I love to go to Shasta, probably my favorite lake in CA, but it is a 6+ hour tow for me. Also, I've been at Shasta when it was 110* outside. Shaver, on the other hand is much smaller, but at 5500' elevation, so it is always 20* cooler than the valley. I imagine that you could make the tow in about 3 hrs, maybe a little more. There is an excellent camp ground (Edison) with good facilities for either tent camping or RVs. We have a cabin there and it looks like I'm going to be "stuck" up there most of the summer, so if you want to come over and check us out, give me a call.
Mark--"Sanger Pete"
(559) 917-1785