Dr. Doug Shields, Water Quality and Ecology Unit, NSL, Oxford, MS was invited to present a lecture and participate in a panel discussion at a special symposium convened in Sacramento, California regarding proposed new federal standards for managing vegetation on flood-control levees. Dr. Shields discussed findings of research he led in the 1980s and early 1990s regarding effects of vegetation on the stability of levees and revetments along the Sacramento River. More recent work by Drs. Simon and Pollen of the NSL on simulating effects of different types of plants on slope stability was also presented. The symposium was attended by about 600 people representing private entities and local, state and federal governments and was covered by the press.