According to the South Dakota Highway Department, the flood waters on the Big Sioux River rose 13 feet in 12 hours. With each passing second, many homes built near the river have already being destroyed.
"It's worse than I thought it was going to be," Dan Duling said.
The Big Sioux River rushes over the road, into fields, and slowly into homes like Doug Henry's.
"It's a lot. It's my whole life," Henry said.
A home which looks like it is sitting on an island is where Henry has lived for more than a decade.
"In 12 years I've never had a problem down here at all," Henry said.
As the water rushes up, Henry says there is nothing else he can do but wait and watch the water run throughout the place he calls home.
"Just the things I've done around here, I don't know, you just got to pick up and move on, you know," Henry said.
His neighbor across the road is also sitting back and watching the water flow.
"It'll fill my basement and probably a foot deep inside my house," Dan Duling said.
Duling lives a mile away from where the water is and he sees it getting worse. He is already preparing with the help of his neighbors.
"We just started loading stuff all day yesterday and I had everybody, people from all around helping me," Duling said.
As for Duling and Henry, both become emotional as they watch the water pass.
"Don't know where it's going to end, don't know how high it's going to go, don't know if I'm going to have a house left. Just going to have to wait and see, just going to stand and watch the water," Duling said.
"I'm just trying to find places to go and stay, I don't know. Where do you go from here, you know," Henry said.
Many people in North Sioux City are preparing for the flood. Some are building small levees to keep the water out of neighborhoods.