I personally have never fished above the Dam but have a freind who used to catch alot of crappie there on blow downs on the Harford co. side. He fished the deep ends of the trees verticaly ,sometimes with minnows sometimes with 1-16 oz. jigs rigged double. We get alot of people fishing down this way in Sussex Co. DE.. I fish MD. eastern shore & lower DE. for crappie more in cooler months though. M ostly salt water fishing Lewes ,IR inlet & OC .in summer.