I lived on the Ohio for years ,I have caught a few fish that were almost coal black so I know they were deep fish,that being said if you stick to fishing 1 to 4 foot deep no mater what the temp. is I think you will do better than trying to find deep fish.I have caught some big fish in 18 inches of water in Aug.,now that is just my experience ,I fished deep but if you dap a 3/16 black and blue jig in every lay down you can find I think you will do better on the Ohio River.