But the misery could stretch on for days.
Officials guess it will be four days before the Cedar River drops enough for workers to even begin pumping out water that has submerged more than 400 blocks, threatened the city's drinking supply and forced the evacuation of a downtown hospital.
"We're estimating at least a couple of weeks before the flood levels get down right around flood stage and below," said Dustin Hinrichs of the Linn County emergency operations center.
The Cedar River crested Friday night at nearly 32 feet, 12 feet higher than the old record set in 1929.
Even as the river slowly recedes, officials worried that the city's supply of fresh drinking water would run out. Only one of the city's half-dozen wells was working, and it was protected by sandbags and generators that were pumping water away from it.
The scope of the damage was extensive, with preliminary damages estimates in Cedar Rapids of $737 million, and officials foresee a long recovery.
"It's a bit overwhelming ... " said the city's Mayor Pro-tem, Brian Fagan. "This is an endurance competition. We have to be patient. We have to be cooperative."
In Des Moines, a mandatory evacuation was ordered early Saturday for about 270 homes after water from the Des Moines River began pouring into an area north of downtown Des Moines.
The 100-foot-wide levee breach occurred about 3:45 a.m. in the city's Birdland Park neighborhood and was threatening North High School.
Many residents of the area already had left after a voluntary evacuation request was issued Friday, but Neil Schultz of the Polk County sheriff's office said officers were going door to door to ensure everyone had left.
Just south of Cedar Rapids, in Iowa City, Gov. Chet Culver warned that more dramatic flooding could be on the way as the Iowa River rises.
"A real wave of water is on the way as we speak," he said.
In Cedar Rapids on Friday the full scope of the damage was becoming clear. At least 438 city blocks were under water, hospital patients in wheelchairs and stretchers were evacuated in the middle of the night, and officials said as many as 10,000 townspeople had been driven from their homes in this city of 120,000.
The flooding was blamed for at least two deaths in Iowa: a driver was killed in an accident on a road under water, and a farmer who went out to check his property was swept away.
Since June 6, Iowa has gotten at least 8 inches of rain. That came after a wet spring that left the ground saturated. As of Friday, nine rivers were at or above historic flood levels. More thunderstorms are possible in the Cedar Rapids area over the weekend, but next week is expected to be sunny and dry.
Gov. Chet Culver declared 83 of the state's 99 counties disaster areas, a designation that helps speed aid and opens the way for loans and grants.
The drenching has also severely damaged the corn crop in America's No. 1 corn state and other parts of the Midwest at a time when corn prices are soaring. Dave Miller, a grain farmer and director of research for the Iowa Farm Bureau, estimated that up to 1.3 million acres of corn and 2 million acres of soy beans
- about 20 percent of the state's overall grain crop - had been lost to flooding.