I have camped there many times. And I have also seen some nice crappie come out of there. I just have no idea on where to get them. Are they coming from the trees? Or What?

The piers both have good brush and lights at them if there are not folks already fishing them. I have had a HOOT at them at night.
Just like any other lake, water temp and depth have a lot to do with it. There is so much timber they don't have to concentrate on local so much.
You should be able to find then pretty easy toward the dam right now.
Make sure you use heavier than normal line because of the bass population. I have caught large bass on crappie jigs and then caught crappie with 3" goldfish in their stomachs.

Let us know how you do. Good luck !