The fish aren't where they usually are

At Nolands Ferry on the Potomac. The locations which are generally reliable for me this time of the year aren't producing. Saturday I tried everything at the near-side of the island, and nothing worked. Finally caught a few bream when I moved into slow water on the Maryland side. Hooked one bass but he jumped and threw the hook. The only effective fly was a damsel nymph. Water level .99 at Point of Rocks. No grasses at all.