"St. Joe is looking, the forecast, to have major flooding to start to occur during the day", according to Pietrycha.
A roadside sign is almost engulfed in water from the flooding Rock River at Castle Rock State Park along state Route 2 near Oregon.
The National Weather Service predicts "much calmer" weather in most areas this weekend, .
"This is an extremely unsafe and life-threatening situation", the weather service said. Evacuation orders are in effect for parts of Fremont and Dodge counties.
Many central Iowa rivers may see moderate flooding into next week from the rain and snowmelt runoff, the weather service said.
Nebraska rescue teams have been pulling trapped residents out of flood waters since Thursday. The sheriff's office said it was trying to contact residents along the Niobrara River to evacuate them. Do not enter flood waters.
Pierce says when it does there will be another round of flooding in those states that will then move south along the Mississippi River into IL and Iowa.
The Saginaw River is expected to crest around 17.4 feet in Bay and Saginaw counties on Sunday morning.
Heavy rain associated with the "bomb cyclone" that moved through in recent days was a big catalyst.
Risky weather conditions were expected for millions who are under some sort of watch, warning or advisory as it heads east and then north. This storm dropped 33 millibars from Tuesday into Wednesday.
"This morning I was notified that there was a breach up at Mills County, so we now have water running down from that breach area", said Mike Creselius, Fremont County Emergency Manager.
However, flooding will persist throughout the MS and Missouri river.
"It was ugly. It still is", Jim Freeman said after using a chain saw to cut up a chunk of ice that floodwaters left in his driveway in Fremont, Nebraska.
Fifteen volunteers were stranded on the lake, eventually rescued themselves with the help of the Nebraska National Guard, which brought in a Black Hawk helicopter, according to CNN affiliate KETV. The Columbus Police Department warned residents to stay away from the Black Bridge.
Officials in other parts of Nebraska said a Norfolk man was seen on top of his flooded auto late on Thursday before being swept away and another man was missing after being swept away when a dam collapsed on the Niobrara river.
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