During September, the U.S. Army Corps of Engineers will conduct vegetation management activities on sandbars in the Missouri River between Yankton and Vermillion, South Dakota, the upper portion of Lewis and Clark Lake near Springfield South Dakota, and Niobrara, Nebraska, and as far upstream as Pickstown, South Dakota This work is being done to keep the sandbars free of vegetation and usable by the threatened piping plover for nesting as well to control invasive common reed that has become prevalent in the lake area.