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This probabilistic forecast is issued by the Missouri Basin River Forecast Center.
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About this graph
Forecasts for the Big Sioux River above Hawarden are issued as needed during times of high water, but are not routinely available.
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Downstream Gauge Downstream Gauge - at Akron
Zoom Level:16
Flood Categories (in feet)
Major Flood Stage: 27
Moderate Flood Stage: 24
Flood Stage: 20.5
Action Stage: 18.5
Low Stage (in feet): -9999

Historic Crests
(1) 35.20 ft on 03/15/2019
(2) 34.00 ft on 06/22/2018
(3) 32.42 ft on 09/15/2019
(4) 23.02 ft on 03/30/2020
(5) 22.38 ft on 05/02/2016
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 18.88 ft on 06/01/2022
(2) 17.30 ft on 08/30/2021
(3) 23.02 ft on 03/30/2020
(4) 32.42 ft on 09/15/2019
(5) 35.20 ft on 03/15/2019
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.
KML Image
Gauge LocationGauge Map Marker
 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 Collapse
If you notice any errors in the below information, please contact our Webmaster
32 water backs up into the park in Hawarden, and some basements and sewers could begin to have problems.
30.5 Iowa Highway 10 begins to flood.
30 South Dakota Highway 46 begins to flood north of Hawarden.
29.5 County Road 13 begins to flood west of Hawarden.
28.5 River Road begins to flood about 1 1/2 miles south of County Road 13.
24 some farm houses on the South Dakota side of the river are isolated by high water.
20.5 agricultural flooding begins on the South Dakota side of the river.

Other Real-time and/or Archive Data Sources:
Additional Information Collapse
This location became the official NWS river forecast point for the Big Sioux River near Hawarden on January 1, 2017. On Wednesday, April 11, 2018, the elevation defining Flood Stage for HWDI4 will be changed from 19.0 feet to 20.5 feet. How low could the river get?
Collaborative Agencies Collapse
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
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