Merc225 is correct TVA only controls grass around docks and public access areas. This same thing happened at Kentucky lake about three years ago. It also happened in the early 90’s. The grass died due to high current flow and muddy water. Grass needs sun to grow and high water flow in winter/spring will pull the new grass loose from the bottom. Like Kentucky lake it will take a few years to come back if we don’t have another muddy spring.