Spent a couple days on Red Rock in July 2016. Only the bottom third of the lake, maybe one campsite, has fire damage. The central and northern parts of the lake were untouched.
There's a little bit of traffic on the lake, passing through to Alpine, but not much. We saw one or two other canoes per day.
We stayed at campsite #407, about halfway down the lake on the western shore, this was a nice site with an easy canoe landing and good spot to fish from shore. It will easily accommodate 3 tents. This picture is from that campsite:
We also explored site #410, on the north-east part of the lake, also a very nice site.