CEDAR RAPIDS, Iowa — President Bush, surveying the aftermath of devastating floods during a lightning-quick tour of the Midwest on Thursday, assured residents and rescuers alike that he is listening to their concerns and understands their exhaustion.

"Obviously, to the extent we can help immediately, we will help," said Bush, still mindful of criticism that the government reacted slowly to Hurricane Katrina three years ago.

"You'll come back better," the president said while being briefed by state and local officials at a cinderblock emergency operations center set up at a community college here, part of a three-hour tour. "Sometimes it's hard to see it."

Bush was in Europe when tornadoes hit and heavy rains sent rivers surging over their banks, killing at least 24 people, the majority in Iowa. Flooding forced tens of thousands across six states to flee their homes and washed out millions of acres of prime farm and grazing lands. He made a point to try to show his deep concern while overseas and traveled to Iowa just two days after returning.

"I really don't have much of an opinion of his coming," said Lashawn Baker, 33, whose family was just starting to clean her flooded home in a southwest Cedar Rapids neighborhood. "It took him a long time to get to New Orleans and he didn't help any of those people, so I don't think he's going to do anything to help Cedar Rapids now that he's here."

Cedar Rapids was submerged in a dirty lake when the Cedar River crested almost 20 feet above flood stage. Now, with the floodwaters having receded, trash was everywhere and businesses and families were trying to determine what could be salvaged.

In Iowa City, a college town about 30 miles to the southeast, the damage was more limited when the Iowa River topped its banks.

But in Missouri and Illinois along the Mississippi River, the danger was still present — not past.

The river tore through a levee late Wednesday at Winfield, about 50 miles north of St. Louis. Another levee still protected most of the town of 720 residents, but residents were urged to evacuate.

Another levee in Lincoln County, Mo., broke Thursday afternoon, threatening the tiny river town of Foley. Officials said nearly all the houses in the town of 200 residents could be flooded.

In the 150-resident village of Hamburg, Ill., also north of St. Louis, there was no levee to hold back the Mississippi, and Mayor Jim Fortner said about 50 prisoners were helping dozens of volunteers hastily add 2 to 3 feet to a half-mile wall of sandbags. The river, expected to continue rising, already had swamped the town's busiest street and significantly damaged seven homes.