Today marks the one-year anniversary of the day the Army Corps of Engineers realized that heavy upstream rains had tipped the Missouri River basin toward potential calamity.
Conditions deteriorated rapidly as the rain continued. Within four days, the corps was calling for evacuations.
And then everything flooded — homes, farms, businesses, roads.
Nearly five months would pass before the battle was declared over on Oct. 17.
Here's a quick look, by the numbers, at the volume of water unleashed by the Flood of 2011:
How long Missouri River records had been kept, none with runoff close to last summer's.
Acre-feet of water that flowed down the Missouri last summer. That's 247 percent of normal.
How long the river was above flood stage at Omaha (May 31 to Sept. 9).
95,625 square miles
The area that one could cover with a foot of water with last year's total runoff. That's essentially all of Nebraska and the western third of Iowa.
How long it would have taken to fill an empty Gavins Point Dam reservoir with the water flowing through the dam at the flood's peak.
Add 60 percent to the summer flow at Niagara Falls, and that's how much water flowed out of Gavins Point Dam at last year's peak.
The Missouri River's crest at Omaha on July 2. The river was 7.29 feet above flood stage.
Missouri River flooding photos
Click on the links below for more images from the 2011 flooding.
Click here for more flood coverage and photos.