Flooding Information: The Latest

We will be updating this page as new information comes in. 

Last Updated on Saturday, September 21, 2019:

UNION COUNTY, South Dakota (KTIV)- UCEMA is starting to see slightly lower water levels on the Big Sioux River.

Union County officials say the Missouri River is maintaining a mostly consistent level.

Officials say that at this time, they are not projected to see observable decreases in the Missouri River levels for the next 24 hours.

They say in the next 3-5 days, they hope to see more significant dropping of the water level on the Missouri River.

The United States Army Corps of Engineers is reviewing their levee conditions and advising on their current levees structures and may aid with improvements should the need arrive.

They say they recognize that you may have become desensitized to our repeated instructions to be alert, be prepared, and to have an emergency plan for your family.

Union County officials advise to not let your guard down!


Friday, September 20, 2019:

DAKOTA DUNES, South Dakota (KTIV)- Based on the current forecast, Dakota Dunes officials say they will be fighting water on their protection until at least Tuesday morning if no additional heavy rains occur in the Missouri River basin.

They say river levels are still extremely high and maintenance on the preventive measures are still on-going.

Dakota Dunes officials say it is important to continue to prepare with relocation still a choice you will need to make.

The sanitary sewer system will only be shut down if the river breaches the protection in residential areas to preserve the infrastructure.

They do not believe water, gas and electric will be impacted at this time, but recommend floor drains remain in place.

Please check on your elderly neighbors as they may not get notices electronically.

NWS Missouri River Projection can be found here.

Big Sioux River Projection can be found here.

Dakota Dunes Community Improvement District Board of Supervisors
(605) 232-4211

AMES, Iowa (KTIV) – Due to area flooding, the Iowa Department of Transportation said they’ve closed Interstate 29 in the Honey Creek area (exit 66) overnight.

Interstate 29 traffic will be detoured using I-680 and I-80.

They said relying on phone or in-vehicle navigation systems may not be reliable as closure changes happen rapidly and navigation systems can route traffic through areas not designed for heavy or some types of traffic.

The best source of information on state and U.S. highways and interstate roadway closures during uncertain weather events is www.511ia.org.

The Sioux County Sheriff’s Office says the west bridge out of Hawarden has now opened for traffic.

The announcement comes just two days after the northbridge opened as water levels along the Big Sioux, north of Sioux City, began to recede. Both bridges closed Monday due to heavy flooding in the area.

Union County Emergency Management (UCEMA) said they’ve recognized that as of Thursday morning, the Big Sioux River and the Missouri River have crested on Wednesday 9-18-19.

The current water levels of the Big Sioux River and the Missouri River throughout Union County are going to remain near their current levels throughout Friday.

They said the forecast from the National Weather Service indicates that both rivers will begin to very slowly recede over the next several days starting midday Friday.

The U.S. Army Corps of Engineers has begun the slow increased releases from Gavin’s Point Dam and plan to reach 80,000 cubic feet per second by this coming weekend.

The National Weather Service forecast is predicting increased chances of rainfall this upcoming weekend.

However, at this time Union County officials said they are not concerned that forecasted rainfall will be impactful to current river situations.

Forecasts are unpredictable so UCEMA said they would like to remind people to please follow posted signs and to remain aware of your surroundings and be aware for any changes in the current situations.

Officials with Statewide Iowa 511 shared on twitter, “so far this morning, SW Iowa roads are open. Levee breaches, heavy rain & swelling rivers could change that quickly. Remember, GPS may not show the road condition accurately. NEVER drive around a barricade, no matter what’s on your GPS. Use 511ia.org.”

Wednesday, September 18, 2019:
NBC Station WOWT is reporting a major levee has been breached in Pottawattamie County close to the Honey Creek exit on Interstate 29.

Around 1:45 p.m. Wednesday, officials said the Honey Creek levee — a major levee that held during flooding in March — had breached and that residents near the area had been sent emergency messages.

It’s the second breach Wednesday after waters broke through a patched levee just a little further north. 6 News was on-site as crews were working to build that levee up along the Missouri River.

At 3:37 p.m., Iowa Department of Transportation tweeted that I-29 would remain open through the evening commute despite the breach near the Honey Creek exit.

“Conditions could change quickly, so If you’re planning to travel on I-29 north of Council Bluffs, check 511ia.org or the 511 app for updates,” the tweet said.

Statewide Iowa 511 is reporting the floodwater in western Iowa is continuing to creep up.

The outside lanes in each direction on I-680 are closed as a precaution and the ramp from westbound I-680 is closed at exit 1 (near Crescent).

They will continue to monitor the area.

Get updates on 511ia.org.

See the latest river levels here.

The Dakota Dunes Community Improvement District Board of Supervisors are asking residents who have relocated to use their best judgement when returning or waiting for the waters to recede after the Missouri River and Big Sioux River crested on Wednesday.

Officials say based on forecasts from the National Weather Service both rivers would be receding very slowly over the next several days.

“We remain vigilant to the effects of the current river pressures on the temporary protection structures in Dakota Dunes and a breach remains a threat,” read the release.

Officials are reminding residents te sanitary sewer system will only be shut down if the river breaches the protection in residential areas to preserve the infrastructure. They also say they do not believe water, gas, and electric will be impacted at this time. They also recommend floor drains remain in place.

In the event of a breach, Supervisors will notify residents via text and email.

READ MORE: Dakota Dunes Community Improvement District continues to encourage residents to relocate


The Missouri River at Sioux City crested at 29.8 feet on Wednesday.

  • To view the National Weather Service’s Missouri River projections click here.

The Big Sioux River at Sioux City crested at 32.8 feet on Wednesday.

  • To view the National Weather Service’s Big Sioux River projections click here.

The Rock River at Rock Rapids crested at 21.54 feet on Saturday and is at 10.92 feet on Wednesday.

  • To view the National Weather Service’s Rock River projections click here.

No flooding is expected on the Little Sioux River at Cherokee.

  • To view the National Weather Service’s Little Sioux River projections click here.

The James River near Yankton, South Dakota, crested at 26.96 feet on Sunday, and is at 16.1 feet on Wednesday.

  • To view the National Weather Service’s James River projections click here. 

Gavins Point Dam:

The U.S. Army Corps of Engineers officials said record rains in the Upper Missouri Basin have prompted them to make changes to the releases from dams.

The Corps says they will start increasing Gavins Point Dam releases near Yankton, South Dakota starting Wednesday morning.

The releases are currently 60,000 thousand cubic feet per second (cfs) and they will be increased by 5,000 cfs each day until Saturday until it reaches 80,000 cfs.

READ MORE: Corps to increase release levels at Gavins Point Dam


The Yankton County Emergency Management says the city’s Transfer Station will be open for no cost disposal of flood-damaged debris from properties within the county.

Drop off’s for the flood-damaged materials begins on Wednesday and runs through October 19.


If you have questions , please contact the Office of Emergency Management at 605-668-5289.

The Yankton County, South Dakota, Office of Emergency Management in conjunction with the Red Cross, has also opened a shelter at 900 Whiting Drive.

September 14, 2019FOR IMMEDIATE RELEASEThe Yankton County Office of Emergency Management’s (YCOEM) in conjunction…

Posted by Yankton County Emergency Management on Saturday, September 14, 2019

Emergency Management said they are closing roads and bridges as needed.

  • To see a map of closed roads in Yankton County, South Dakota, click here.

READ MORE: Shelter in Yankton County, SD, offering flood victims a place to eat and sleep


The Union County, South Dakota, Emergency Management Agency says they continue to monitor the river levels that affect the entire county. Emergency Management officials said they are monitoring the river forecasts and projections from the National Weather Service and are in continual contact with local municipalities, communities, state, and federal agencies.

The Union County, South Dakota, Sheriff’s Office said with the rising water from rivers and streams, county roads and state highways will become covered and will be closed.

Portions of the following Union County Highways are closed due to flooding:

  • Jefferson Bridge on CR#07
  • 478 Avenue between State Highway 50 & 321
  • 481 Avenue between 325 and 326 Streets
  • River Road – 302 Street south to 304 Street
  • 299 Street – 484 Avenue east to SD Hwy 46
  • 302 Street – River Road east to the Hawarden Bridge
  • Henke Road – South portion to SD Hwy 50

For more information on Union County roads click here.


Officials in Rock Valley, Iowa, said they continue to monitor the Rock River and are in contact with the National Weather Service and are prepared if an emergency situation arises.

Pumps are staged in areas to pump potential stormwater if there is significant rainfall.

Berms are still in place from May flooding and the City of Rock Valley has constructed additional flood control measures in areas throughout the community. At this time, no volunteer action is being taken.

For the full release from the City of Rock Valley click here. 


The Rock River at Rock Rapids crested at 21.54 feet on Saturday.

The Rock Rapids Chamber of Commerce said in a Facebook post, “It appears we have been spared any significant damage.”


The Sioux County, Iowa, Sheriff’s Office are monitoring roadways as river levels rise.

  • According to the Sioux County Sheriff, the northbridge out of Hawarden has reopened. However the west bridge is still closed.

  • According to the Sioux County Sheriff water is going over the roadway on County Road 13/10th Street on the west side of Hawarden.

For the latest on road conditions from the Sioux County Sheriff’s Office click here. 

READ MORE: Bridges remain closed at Hawarden and Akron; water levels are starting to recede


Akron Fire-Rescue are advising residents in Akron, Iowa, to keep all ATV’s, UTV’s and any other motorized vehicle off the water saturated levees protecting town.

On Friday Akron Fire-Rescue worked on preparations for possible flooding on the Big Sioux.

Bag filling happening at city shop. If you have 30 minutes stop down and lend a hand.

Posted by Akron Fire-Rescue Akron , Iowa on Saturday, September 14, 2019

Dean Welte

Dean Welte

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