When river levels exceed flood stage by several feet, serious problems can occur.
Flood stage at Vicksburg, the level at which the river may begin flowing over its banks, is 43 feet.
CNN: Jindal: Morganza Spillway could open as early as Saturday
Rivers to Louisiana's southeast, near Mississippi, have also gone over flood stage, but inundation has not been dramatic there.
Forecasters now expect it to climb up to 12 feet above flood stage at some spots in Missouri and Illinois.
The Wabash River in Tippecanoe County reached more than 14 feet above flood stage on Saturday, the highest level since 1958.
Another area river, the Anclote, was above flood stage on Tuesday, and water is not expected to recede for two days.
Flood warnings have also been issued for the San Antonio River, Medina River and Salado Creek, all of which are above flood stage.
Johns River is still at maximum flood stage and rising, because all the water that' fell in Melbourne flows downstream which for the St.
Meanwhile, in the Arkansas town of Helena, the river crested at 56.5 feet -- 12.5 feet above flood stage, according to the National Weather Service.
CNN: Jindal: Morganza Spillway could open as early as Saturday
The National Weather Service said that as of Friday morning, the river was at 16.8 feet in New Orleans, just a fraction below flood stage.
CNN: Jindal: Morganza Spillway could open as early as Saturday
Spillway gates are likely to be open for weeks, meaning it will be some time before the river falls below flood stage, allowing evacuees to return.
Much of the rain flushed directly into the lake, but rivers are expected to remain above flood stage for about a week, according to a National Weather Service official.
The San Antonio River about 20 miles southeast of the city, near Elmendorf, was expected to peak at 62 feet by Sunday morning, well above the flood stage of 35 feet.
As Saturday's rains pushed creeks over their banks -- Neshaminy Creek crested at nearly twice its 9-foot flood stage -- water rose into dozens of homes, and several motorists were left stranded.
Officials said the spillway gates are likely to be open for weeks, and it will be weeks before the river falls below flood stage, allowing those who have evacuated to return safely.
The National Guard worked around the clock to construct a flood barrier in Morgan City, Louisiana, where the Atchafalaya River was already 3.15 feet above flood stage, according to the National Weather Service.
CNN: Jindal: Morganza Spillway could open as early as Saturday
Volunteers in the tiny community have worked endlessly since Wednesday to build a makeshift sandbag levee that seemed to be holding as the crest expected to be 11 feet above flood stage approached.
Some of the spillway's gates will likely be open for weeks, and it'll be at least that long before the river falls safely below flood stage and those who have evacuated can safely return, said Col.
The Mississippi River is not expected to return to its 43-foot flood stage in Vicksburg until after June 14, which is 46 days after it climbed out of its banks, said Amanda Roberts, a National Weather Service hydrologist.
Last month, the council released details on how traffic will be diverted during the first stage of constructing the flood alleviation scheme.
More and more singer-songwriters from the pop world seem to be hearing that siren song: The trickle of pop and rock stars turning to the stage is fast becoming a flood.
Last month, Highland Council published details on how traffic will be diverted during the first stage of constructing the River Ness Flood Alleviation Scheme.
All of the aforementioned organizations play a vital role ranging from flood forecasting to flood management and knowledge platform will enhance their inter-organizational coordination framework while sharing precipitation, stage, and discharge data in near real-time.
The first stage of the development will include extensive work to waterways, including the construction of river walls and flood defence walls.
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