A mandatory evacuation is planned for if the river level rises 8.6 feet above the flood stage.
The Mississippi River ticked above levels reached in the historic 1993 flood in Davenport, Iowa, making it the highest level there in 157 years.
The Tippecanoe River near Ora was at 13.27 feet at 6:30 p.m. Thursday, which is slightly above the river's 13-foot moderate flood stage.
With flood recovery in high gear along the Missouri River, Iowa's other high-water bookend is taking aim at Davenport.
The Illinois River at Peoria is forecasted to crest near 27-point-five feet Sunday.
"We've been through this before", Machens said. Davenport has no permanent levee or floodwall.
Mayor Frank Klipsch says no one was injured Tuesday in the flooding.
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The casino is located west of the Missouri River, in the heart of Omaha.
As well, the flood warning has been extended through Monday afternoon for the Tippecanoe River near Ora and Monday evening for the Yellow River in Knox.
The latest round of flooding in the Midwest has claimed at least four lives, closed hundreds of roads and forced residents of threatened towns to shore up threatened levees with sandbags.
Two Mississippi River bridges - one at Quincy, Illinois, and another at Louisiana, Missouri, have been forced to close.
Officials in the Quad Cities say they have the flooding contained, but now the waiting begins. "There is not a lot we can do with water filling the buildings".
"The temporary flood protection levee that they put in place failed this afternoon and it's inundating a portion of downtown Davenport", Scott County Emergency Management Director told The Weather Channel.
"Rounds of additional rain in Iowa and IL and a melt of snow cover from some April storms pushed the river higher since late April", Erdman added.