That lake can be REALLY tough for crappie in the summer. Lots of timber to fish, but with lake levels up and recent rains most of it is hard to find unless you've got it marked already. I would stick with the South end. The North end will be muddy with the recent heavy rains just north of there. Focus on the 2-3 feeder creek arms on that south end and fish timber in 15-20' water. Get minnows, or you'll be disappointed.
I've lived close to Limestone since it was impounded. It's always been a hit and miss crappie lake. If you get a place there and start making brush piles, you can have success though. It's a much better catfish lake more than anything else.
My 2 cents...