As the Mississippi River and its tributaries retreated from historic winter levels that flooded towns, forced evacuations and killed two dozen people, residents in the St. Louis area were facing a massive cleanup and recovery effort that will likely last weeks.

“The healing process, the restoration process has begun,” Chris Greenhagen, pastor of the Central Baptist Church in Eureka, Missouri, one of the communities hit by flooding along the Meramec River earlier this week, said Saturday in a phone interview.

The flood, fueled by more than 10 inches of rain over a three-day period that began last weekend, is blamed for 24 deaths in Illinois and Missouri.

The Mississippi River was receding throughout Missouri and Illinois except in the far southern tip of both states. The Meramec River, the St. Louis-area tributary of the Mississippi that caused so much damage last week, was already below flood stage in the hard-hit Missouri towns of Pacific and Eureka and dropping elsewhere.

While residents took stock of the ruin, President Barack Obama on Saturday signed a federal emergency declaration for Missouri that allows federal aid to be used to help state and local response efforts. It also allows the Federal Emergency Management Agency to coordinate disaster relief efforts. Missouri Gov. Jay Nixon had asked for the help.

Nixon and Illinois Gov. Bruce Rauner also toured flood-ravaged areas as near-record crest predictions of the Mississippi River and levee breaks threatened more homes. He encouraged people to respect requests to evacuate.

“This is life-threatening,” Rauner told reporters at Carlyle Lake in Clinton County in southern Illinois. “It’s not just the water; it’s the temperature. Hypothermia is a big risk to people’s lives.”

Several homes were damaged and residents evacuated in New Athens, Illinois, a town of 2,000 residents about 30 miles southeast of St. Louis. The Kaskaskia River there topped the previous record by more than 5 feet.

St. Clair County, Illinois, emergency management director Herb Simmons said damage assessment was beginning Sunday now that the river was starting to fall. Though water reached higher than 1993, this flood wasn’t as bad, Simmons said.

“In ‘93 that water came up and stayed on the levees for several months,” Simmons said. “This flood came up quick and went down quick.”

In Missouri, Noelle Pace said she packed up electronics, some furniture and her 4-year-old son’s clothing and toys and left Pacific on Dec. 28, the day after she received a request to evacuate. She felt lucky to find the damage isolated to her crawl space when she returned for the first time Thursday.

“Everybody around us had catastrophic damage,” Pace said. She said she might not be able to move back for weeks while her landlord replaces soaked insulation.

“It doesn’t feel real yet,” she said.

Illinois Emergency Management Agency spokeswoman Patti Thompson said the state’s flooding death toll increased to nine. Fifteen have died in Missouri.

Cleanup in the St. Louis region was largely focused around the Meramec. Two wastewater treatment plants were so damaged by the floodwaters that raw sewage spewed into the river. Hundreds of people were evacuated in the Missouri communities of Pacific, Eureka, Valley Park and Arnold, where many homes took in water.

William Reynolds said he moved at least $50,000 worth of inventory from his Valley Park store to the second story of his nearby home when the area was evacuated. He was still unpacking Saturday after the evacuation was lifted.

In southeast Missouri, up to 30 homes and several businesses were damaged in Cape Girardeau, a community of nearly 40,000 residents that is mostly protected by a flood wall. The Mississippi peaked at 48.9 feet Friday night, four-tenths of a foot above the 1993 record, but short of the 50-foot mark projected. Nearby levee breaks in other places kept the crest down.

“What we’d like people to know is that in Cape Girardeau there have been so many precautions in place that even given the magnitude of this event it’s really gone remarkably well for us,” Molly Hood, Cape Girardeau’s deputy city manager, said Saturday.

Elsewhere, the Illinois River continued to rise Saturday and could near historic crests Tuesday or Wednesday, according to Thomas Spriggs, meteorologist with the National Weather Service in St. Louis.

“It’s still a very significant flood,” Spriggs said. “It’s going to be at major flood stage for the next three days.”

Parts of the South were also in the flood’s path.

Moderate Mississippi River flooding is expected in Memphis, Tennessee. Dale Lane, director of the Shelby County Office of Preparedness, said high water from the river and its tributaries was approaching some homes on Mud Island, just south of downtown Memphis.

The National Weather Service issued a flood advisory for the Cumberland River at Dover, Tennessee, through Monday evening.

Minor flooding along the Ohio River was affecting the Kentucky cities of Owensboro and Paducah, and the crest wasn’t expected until Thursday.