I suppose that you were first fishing for crappie? The mid part of the Grand arm has been producing pretty well both on jigs and minnows. I've been fishing the bigger main lake flats with lots of timber and fishing the back, shallow part of the flats getting up into water that is 4 to 5 feet deep going tree to tree you seldom catch more than a couple of crappie of a tree mostly one here and there but keep moving and you can end up with a nice limit. I usually fish out to 15 to 20 ft and even then the crappie have not been over 8 ft deep.
Get a good lake map and look up G10, G4 on the Grand arm, the cemetery of the Little Tebo, and O3, the Airport, and KK Island on the Osage arm all good spots for Hybrids and White Bass from now until late Fall.
Good Luck!
RB