The weather service believes it will fall below flood stage at about 8 a.m. Saturday.
The Mississippi River ticked above levels reached in the historic 1993 flood in Davenport, Iowa, making it the highest level there in 157 years.
"We had a lot of rain overnight which could nudge this up a little more, but it shouldn't be much". Davenport Mayor Frank Klipsch said at a news conference Wednesday that the city has 9 miles (14 kilometers) of riverfront, making the prospect of a floodwall to protect all of it outlandishly expensive.
The river is already more than 8 feet (2.4 meters) above flood stage at St. Louis and expected to rise another 4 feet (1.2 meters) by Monday.
As of Wednesday afternoon, Ottawa closed Green Street, Allen Park, Champlain Street at the aqueduct, Fox River Park, Riverwalk, Albin Stephen's Drive, Hudson Street, St. George Street and East Main Park is closed at Main Street.More news: Japanese royals: Emperor Naruhito makes history at accession ceremony - best photos
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In other areas throughout the Midwest and the South, flooding has made roads impassable and forced the closure of two Mississippi River bridges in Quincy, Illinois, and Louisiana, Missouri. On that date, the official height of the flood gauge at Rock Island achieved 22.63 feet.
"We're going to have a full-fledged flood fight", Hark said.
Additionally, the waters could rise to infiltrate the Ottawa River Rescue building.
"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.
Parts of the Ozarks region of Missouri received up to 6 inches (15 centimeters) of rain Wednesday night and Thursday morning, prompting flash flooding that forced hasty evacuations in some areas. But the high water could bring a mandatory halt to river traffic, including barges.