Lake britton has the bridge from "Stand by me" so that's pretty sweet. One August morning I saw a bunch of trout rising for mayflies along the shore. I never wet a line there though.
However, I have done the Pit, and I'll be heading there in a week. If you don't bring a wading staff you're an idiot. There is a lot of good access to pit 3. If you are coming from Burney, I wouldn't even bother with 4 and 5 because you'll just be driving past good water with good access.
I didn't have a whole lot of success, but 110° august weather isn't ideal. You're going to want heavily weighted flies or a bunch split shot. And bring A LOT of flies. I lost 4 flies in my first two drifts when I was there.