The swollen Missouri River had posed a serious threat to a riverside nuclear power plant in the state of Nebraska in the United States after levees built to hold back the rising floodwaters failed.

The Fort Calhoun nuclear power plant was reportedly very close to getting engulfed by the floodwaters, raising fears of a crisis similar to Japan’s Fukushima disaster.

Though the nuclear plant declared the event as “unusual,” the Nuclear Regulatory Commission (NRC) maintained that there was no risk of disaster.

Tokyo Electric Power Company (TEPCO)'s Fukushima Dai-ichi nuclear power plant in Fukushima prefecture, Japan, was devastated by Tsunami waves in March 2011, leading to leakage of radioactive water into the ocean.

As a massive earthquake and tsunami killed thousands of people in Japan, radiation woes and a much more severe nuclear crisis took the country’s economy into recession affecting businesses, consumer spending and tearing apart supply chains.

Federal officials widened flood gates last week to allow record, or near-record water releases to ease pressure on six major reservoirs swollen by heavy rains and melting snow, Reuters reported.

But later in the week, Missouri River floodwaters reached a levee built up to protect Hamburg, Iowa, after the main protection along the river failed, a county emergency official said.

Check out some of the latest pictures of Missouri river flooding below:

Missouri river flooding threatened Americas nuclear plant
A crew of U.S. Fish & Wildlife Service employees reinforce a levy to stop flood waters more than a mile away from the Missouri River in rural Missouri Valley, Iowa, June 17, 2011. The Missouri River, swollen by heavy rains and melted snow, has been flooding areas from Montana through Missouri. REUTERS
Missouri river flooding threatened Americas nuclear plant
Vehicles sit stranded in flood waters in rural Missouri Valley, Iowa June 17, 2011. Missouri River floodwaters have reached a levee built up this week to protect Hamburg, Iowa, after the main protection along the river failed, a county emergency official said on Thursday. REUTERS
Missouri river flooding threatened Americas nuclear plant
U.S. Fish & Wildlife Service employees reinforce a levy more than a mile away from the Missouri River in rural Missouri Valley, Iowa, June 17, 2011. REUTERS
Missouri river flooding threatened Americas nuclear plant
Steve Howerton ties a sandbag as U.S. Fish & Wildlife Service employees reinforce a levy to stop flood waters more than a mile away from the Missouri River in rural Missouri Valley, Iowa, June 17, 2011. REUTERS
Missouri river flooding threatened Americas nuclear plant
A pickup truck is submerged on an access road just east of Blair, Nebraska, June 12, 2011. Residents have been shoring up levees along the Missouri River from Montana through Missouri as federal officials widen flood gates to allow record, or near-record water releases to ease pressure on six major reservoirs swollen by heavy rains and melting snow. REUTERS/Daniel Wallis1
Earthquake Japan Tsunami Japan