Are there crayfish in the lake there

Do not swim at this Lake it is horrible very very dirty but nice place to walk around

I haven't seen any

I have never seen any but there are creek areas at either entrance that are like the environments they live in. If you are asking for bait purposes, I would call the park office.

Not too sure I go there mostly to hike

Yes but shallow water Mud bugs are nasty.

Unfortunately there's more trash than anything, as it flows down the streams from nearby Winder.

Probably so but mostly in the feeder creeks.

I don't know, someone caught a really big catfish when we were there.