From September 3 through September 20, 2013, the U.S. Army Corps of Engineers will have a contractor spraying sandbars in the Missouri River between Pickstown, S.D. and Ponca, Neb. with aquatically-approved herbicides for vegetation control on emergent sandbar habitat. Approximately 10 sandbars will be treated in the Pickstown to Niobrara reach (river miles 870.0 to 846.0) and approximately 30 sandbars will be treated in the Yankton to Ponca reach (river miles 805.0 to 754.0).