Get that float tube and put a depth(fish) finder on it. Those fish are holding off shore on the structure. There's some high spots about 100 yards straight off the bank from where you were fishing. There's also some off the dam. The ones off the dam might be sticking out by now. But the fish will hang around those things in about 2'-15' of water depending on the time of day. Also around that island off Lure Point can be good. Just stick with. There's a lot of fish in that lake.