 In September 1999, the Army Corps of Engineers—which retained ownership of Kingman Lake—began transforming the lake back into a tidal marsh.The Corps said it would remove some of the riprap wall and create of marsh north of Benning Bridge and of marsh between Benning Bridge and East Capitol Street Bridge.Work on the tidal marsh would be complete by March 2000, and during the summer of 2000 the Corps intended to plant tens of thousands of aquatic plants in the new marshlands.