Forecasts from the Weather Service indicate that the water level at the plant may rise to about 45.5 feet this weekend, which would require a shutdown.
The potential for ice jams still remains in New Hamburg, Plattsville, Six Nations Territory, Cayuga and Port Maitland.
River levels will be on the rise through Friday night with a few expected to reach flood stage over NE Iowa and many others to come close to flood stage.
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The storm also significantly increased spring flood worries in the Red River Valley in the Upper Midwest, where the neighboring cities of Fargo, North Dakota, and Moorhead, Minnesota, experienced a record flood 10 years ago.
"All the rivers respond differently, have different time scales that they flood and then recede".
A Nebraska utility is adding sandbags to the levee that protects its nuclear power plant along the swollen Missouri River.
About 45 miles northwest of Omaha, the town of North Bend - home to almost 1,200 along the banks of the Platte River - emergency workers used boats to evacuate residents.
The National Weather Service predicted unsafe flooding would continue through the weekend in Nebraska and in south and west central Iowa, particularly along the Missouri River.
Flooding is also common across Iowa, with numerous roads statewide closed. Homes were reported damaged, while power was knocked out to thousands. But meteorologist Paul Fajman in Omaha says the effects aren't expected to be as bad as what was seen farther west and south. The flooding was the worst in almost a decade in places.
A bomb cyclone occurs when there is a rapid drop in atmospheric pressure.
The flooding has been caused by a combination of factors. It's warmed up. The ground is frozen still. It was exacerbated by a now-melting hefty winter snow pack left by record winter precipitation.
This article was written by Mark Berman, a reporter for The Washington Post.More news: Watch the New AVENGERS: ENDGAME Trailer