More than 200 children and staff were flown by Black Hawk helicopters from Camp Taum Sauk after floodwaters washed out roads around the Missouri summer camp.
One woman, Faith Gregory, was found dead in Crawford County after her home was swept from its foundation; officials said no one else remained missing there.
Friday's slow-moving storms dumped 6 to 12 inches of rain in parts of Missouri, triggering rescues from trees, rooftops and stranded vehicles and capsizing two rescue boats before crews recovered the responders.
Gov. Mike Kehoe declared an emergency as the Black River kept rising toward a forecast crest above 28 feet near Annapolis, a level expected to set a record.
The storm system was shifting south but still threatened eastern Tennessee and areas from Kentucky to West Virginia with flash flooding, road closures and downed power lines into Sunday.