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Visit for access to new EXPERIMENTAL products and services from the National Water Center: National Hydrologic Discussion, Area Hydrologic Discussion, Flood Hazard Outlook and the National Water Center Visualization Services, a suite of geospatial services depicting River Forecast Center and National Water Model information.

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Hydrograph River at a Glance Download
Big Sioux River near Richland Stage (ft)Flow (cfs)Highest Observation: 1105.88 ft at 11:00PM Jan 19, 2023South Dakota DANRBSRS2(plotting HGIRG) Graph Created (1:19PM Jan 28, 2023)ObservedLatest observed value: 1105.88 ft at 11:00 PM CST 19-Jan-2023. Flood Stage is 1117 ft
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About this graph
Tabular Data (UTC)
Tabular Data (CST)
XML Data
RSS Files
Datum: NAVD88
NOTE: No forecasts are available for this location

NOTE: Gauge reading may be affected by ice.

NOTE: Forecasts are not available for the Big Sioux River near Richland. Only observed stages are available for this point.

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Upstream Gauge - at Akron Upstream Gauge Downstream Gauge Downstream Gauge - near Jefferson
Flood Categories (in feet)
Major Flood Stage: 1121
Moderate Flood Stage: 1119
Flood Stage: 1117
Action Stage: 1116
Low Stage (in feet): 0

Historic Crests
(1) 1,125.63 ft on 06/18/2014
(2) 1,124.50 ft on 03/16/2019
(3) 1,124.40 ft on 06/24/2018
(4) 1,123.51 ft on 09/17/2019 (P)
(5) 1,118.80 ft on 04/01/2018
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 1,118.67 ft on 04/01/2020
(2) 1,123.51 ft on 09/17/2019 (P)
(3) 1,124.50 ft on 03/16/2019
(4) 1,124.40 ft on 06/24/2018
(5) 1,118.80 ft on 04/01/2018
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.

For more information on your flood risk go to

Zoom Level:16
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Gauge LocationGauge Map Marker
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.
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If you notice any errors in the below information, please contact our Webmaster
1124.5 South Dakota Highway 50 begins flooding.
1123.5 Iowa Highway 3 begins flooding.
1121 some farm levees will be overtopped and some farm buildings will be flooded.
1119 widespread flooding of crop and pasture land begins.
1117 lower pasture lands begin to flood, and the Millsite Access is flooded.
About This Location Collapse

Latitude: 42.761737° N, Longitude: 96.632551° W, Horizontal Datum: NAD27

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 1117 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)
(gauge height = flood stage)
Elevation information source
NAVD88 0.00 1117.00 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  
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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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Page last modified: 2-Nov-2020 7:29 PM
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