PHOTOS: Dramatic aerial views of Midwest flooding

Emergency officials in Southern U.S. states kept a wary eye on the Missouri and Mississippi rivers as massive flooding that killed four people and caused more than $1 billion in estimated damages to homes, businesses and crops threatened to extend south.

Floodwaters inundated a large swath of Midwestern farm states Missouri, Nebraska and Iowa along the Missouri. States of emergency have been declared in all or parts of the three states. (REUTERS)