Mississippi River flooding wasn't as pronounced as its water level varies greatly but is typically highest in the spring, so minor flooding is not uncommon.

NPR: Floodwaters Rising After Storms Deluge Heartland

Nancy Rabalais, executive director of the Louisiana Universities Marine Consortium and an expert on dead zones who didn't participate in the study, said its findings are consistent with climate change scenarios she projects for the upper Mississippi River basin, where flooding caused high algae concentrations two years ago.

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Mississippi River is changing as the flooding is rearranging life on land and overrunning parts of the bayou.

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Nine were closed due to the flooding of the Mississippi River, said Bill Canter, spokesman for the Tunica Convention and Visitors Bureau.

CNN: STORY HIGHLIGHTS

Such a move isn't unusual for the agency, which last issued a similar advisory last spring for banks affected by flooding along the Mississippi River, a spokesman said.

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Emergency managers along the Mississippi, Missouri and Red River basins used NOAA climate data to help lessen flooding, months before it began.

CNN: Extreme weather and a changing climate

Mississippi River communities in Iowa, Illinois and Missouri are expected to see significant flooding some near-record levels by the weekend, a sharp contrast to just two months ago when the river was approaching record lows.

NPR: Floodwaters Rising After Storms Deluge Heartland

Mississippi River levels vary greatly but are typically highest in the spring, so minor flooding is not uncommon.

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