Richard, most of my crappie fishing is on Lake Hartwell, but this stuff should hold true for the the other big reservoirs. I've found that the fishing maps with brushpile locations are helpful. Once you locate a pile, just choose your favorite downsized bait. I like Roadrunners with a small white grub trailer, Beetle Spins, also with a white grub, or Rooster tails in rainbow trout, green and/or white colors. Sometimes I'll throw a jig head with a small grub. I try to cast past the pile and drag it right over the top. You have to be ready to lose a bunch of these lures, cause they will get hooked in the pile. Break off without going into the pile to get it.
Some of the very small Bomber crankbaits work well, and the little trebble hooks are much more consistent for landing a fish that hits than the single point hooks, but I find that I am unwilling to lose them as readily, so I cast more conservatively with them, which reduces the effectiveness.
If the fish are fickle, a live cricket on a downline works.