the agent differentiated CNN.

(CNN) -- The swollen Missouri River rinsed over and punched via levees in northwestern Missouri early Sunday, spurring authorities to urge about 250 nearby residents to leave their homes.

The river gapped levees at two points overnight and overtopped them at two others approximate Corning, Missouri, approximately 100 miles north of Kansas City, the Holt County Sheriff's Department reported. Most residents had already removed out deserving to voluntary evacuation shrieks, but authorities went door-to-door early Sunday to order almost 30 folk who remained to leave, the agency told CNN.

Upriver, evacuation advisories went out for 200 to 250 people in the town of Watson and additional places west of Interstate 29, said Mark Manchester, the deputy crisis management mentor in Atchison County. Water was sloshing over the levees "at a beautiful good mow" Sunday morning and had already topped the county's previous disc brand, set in 1993, he said.

"We're in uncharted waters here," Manchester said.

The Missouri was extra than 11.5 feet over flood stage at handy Brownville, according to National Weather Service data.

And along the state line in Hamburg, Iowa, where 2 levees failed last week, the creek was anticipated apt crest by 10 feet over overrun stage in the coming days, Fremont County Emergency Management capital Mike Crecelius said.

Crecelius said the river has been over flood stage since late April, and namely forecasters are projecting river flows of 150,000 cubic feet (1.1 million gallons) per second through August.

"They're not designed for this sum of oppression for this length of time," Crecelius said. "They've never been tested like this."

Heavy rainfall in Montana and North Dakota, combined with melting sleet from the Rocky Mountains, have sent the Missouri surging downstream, according to the National Weather Service. The 6 to 12 inches of rainfall in the upper Missouri basin in the quondam few weeks is nearly a natural year's worth, and runoff from the mountain snowpack is 140% of normal, the agency says.

CNN's Matt Smith and Divina Mims endowed to this report.