Web Portal Changes: The Advanced Hydrologic Prediction Service (AHPS) hosted at https://water.weather.gov will be replaced by the National Water Prediction Service (NWPS), with a target of March 2024. Existing AHPS content and features will be preserved and expanded within NWPS.

Experimental National Water Center Products: Flood Inundation Mapping services are now available for 10% of the U.S. population. Please visit https://www.weather.gov/owp/operations for more information. The National Hydrologic Discussion, Area Hydrologic Discussion, Flood Hazard Outlook, and real-time geospatial services depicting River Forecast Center and National Water Model forecasts, continue to be accessible via the URL above, as described in the StoryMap here.

Weather Forecast Office Sioux Falls, SD

Missouri Basin River Forecast Center

Hydrograph

River at a Glance

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Probability Information Weekly Chance of Exceeding Levels Chance of Exceeding Levels During Entire Period Short-term Probabilistic Guidance (Experimental)

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Printable Image About this graph Tabular Data (UTC) Tabular Data (CDT) Datum: NAVD88 Metadata

NOTE: River forecasts for this location take into account past precipitation and the precipitation amounts expected approximately 24 hours into the future from the forecast issuance time. NOTE: Gauge reading affected by reservoir operations. NOTE: Forecasts for the Missouri River at Sioux City are issued routinely year-round.

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Upstream Gauge

Downstream Gauge

Flood Categories (in feet) Major Flood Stage: 36 Moderate Flood Stage: 33 Flood Stage: 30 Action Stage: 25 Low Stage (in feet): -9999 Historic Crests (1) 44.28 ft on 04/14/1952 (2) 38.72 ft on 04/10/1943 (3) 38.44 ft on 04/25/1950 (4) 35.72 ft on 04/10/1949 (5) 35.45 ft on 04/12/1944 Show More Historic Crests (P): Preliminary values subject to further review. Recent Crests (1) 12.87 ft on 08/16/2022 (2) 18.12 ft on 04/01/2020 (3) 25.92 ft on 10/21/2019 (4) 30.27 ft on 06/01/2019 (5) 29.78 ft on 03/17/2019 Show More Recent Crests (P): Preliminary values subject to further review. Low Water Records (1) 2.97 ft on 01/02/2022 (2) 4.12 ft on 12/30/2013 (3) 6.93 ft on 01/19/1996 (4) 7.83 ft on 01/09/1989 For more information on your flood risk go to www.floodsmart.gov. Show FEMA's National Flood Hazard Layers FEMA's National Flood Hazard Layers not showing? Why aren't the FEMA National Flood Hazard Layers showing on the ESRI Map? Possible reasons: There are no FEMA National Flood Hazard Layers for the location which you are viewing on ESRI Maps. The FEMA Web Mapping Service (WMS) is down. Note: Your zoom level may have changed. ESRI's zoom levels must be between 14 and 16 to show National Flood Hazard layers.

Zoom Level:14 Legend FEMA Layer Gauge Location Disclaimer Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.

Flood Impacts & Photos

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39	Water reaches portions of 4th St in South Sioux City near the gauge location under the Hwy 20 bridge.
36	Extensive urban flooding in lower lying portions of Sioux City begins.
35	The levee protecting various structures in parks and memorials on the Iowa side of the river is overtopped.
33	Additional recreational areas and some pasture land along the river begin to flood.
31	The baseball fields at Scenic Park are flooded.
30	Some of the boat docks and marinas along the river begin to flood. The levee at the Scenic Park campground is overtopped at flooding may impact the parking lot at the Lewis and Clark Interpretive Center if the levee is breached.
29	The parking lot of baseball fields at Scenic Park begin to flood on the Nebraska side of the river. The lowest portions near the Lewis and Clark Interpretive Center and Flight 232 Memorial begin to flood.
25	Lower Scenic Park campground in South Sioux City may begin to be affected by flooding.
7	The power plants around Sioux City have problems as the water levels fall below what is needed for the cooling intake valves.
Photos (1) Upstream View (IA Side) (2) Downstream View (IA Side)

About This Location

Latitude: 42.485833° N, Longitude: 96.413611° W, Horizontal Datum: NAD27 River Stage Reference Frame Gauge Height Flood Stage Uses NWS stage 0 ft 30 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps Vertical Datum Elevation (gauge height = 0) Elevation (gauge height = flood stage) Elevation information source NAVD88 1057.42 ft 1087.42 ft Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps NGVD 29 Not Available Not Available Older USGS topographic maps, NGVD29 benchmarks MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks Other Not Available Not Available   Current/Historical Observations: Corps of Engineers (COE) Info for Sioux City U.S. Geological Survey (USGS) Data and Site Info for Sioux City

Additional Information

How low could the river get?

Resources

Hydrologic Resources Text Products Past Precipitation Forecast Precipitation River Forecast Centers River Stage Summary Upper Missouri River Basin Monitoring Network Missouri Basin River Forecast Center North Central River Forecast Center NOHRSC Snow Information Drought Monitor USGS HADS River Stage Data Inundation Mapping Locations Precipitation Frequency Data South Dakota Flood Information System Iowa Flood Center Minnesota DNR FEMA Region VIII Flood Information ___

Additional Resources Area Hydrographs NWS Precipitation and River Forecasting AHPS Iframes for Developers Mobile iNWS for emergency management SDSU Climate and Weather SDSU Drought Dashboard Iowa State University Soil Temperatures Iowa DNR State Beach Water Quality Daily High Temperature Map Daily Low Temperature Map Daily Precipitation Map Daily Snowfall Map Daily Snow Depth Map Report on July 29-30, 2010 heavy rain/flood event in Jerauld County

Collaborative Agencies The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here. NWS Information National Weather Service Sioux Falls Weather Forecast Office 26 Weather Lane Sioux Falls, SD 57104-0198 (605) 330-4247 Ask Questions/Webmaster Page last modified: 2-Nov-2020 7:29 PM Disclaimer Credits Glossary Privacy Policy About Us Career Opportunities