Cast net or a big dip (shrimp) net just around vegetation close to the shore. of course watch out for the gators. I have caught two by the dam at the actual state park part. My friends have caught a few there too.
We haven't tried traps yet, but we don't really go out there to catch the craws. I'm pretty sure a trap would work unless a gator or big catfish wrecks it and the water isn't flowing too quickly.