Officials fear the deadly floods in Missouri and Illinois will get worse as rivers and stream waters rise above federal levees built to protect communities and farmland.
Since Dec. 25, the floods have killed 7 people in the two Midwest states.
Firefighters in boats were deployed in Eureka, Missouri, a city southwest of St. Louis, to rescue residents. In one instance a man and his dog were saved while they sat on the roof of a house as floodwaters had risen to the eaves, reports The Associated Press.
Heavy rainfall in the region has caused the flooding, with rivers including the Mississippi, Missouri and Meremac bursting their banks.
On Wednesday, the U.S. Army Corps of Engineers announced that water had already risen above 9 levees and another 11 could be breached.
Forced evacuations are taking place in some parts of the states and highways are being shut, in response to the floods. President Barack Obama has pledged federal government support to Missouri Gov. Jay Nixon.
See photos of the flooding below: