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Advanced Hydrologic Prediction Service
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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 near Castlewood are issued as needed during times of high water, but are not routinely available.

Vertical Datum updated from NGVD29 to NAVD88 by gauge owner.

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Zoom Level:14
Flood Categories (in feet)
Major Flood Stage: 16
Moderate Flood Stage: 11
Flood Stage: 9
Action Stage: 8
Low Stage (in feet): -9999

Historic Crests
(1) 13.19 ft on 04/07/1997
(2) 12.39 ft on 03/28/2019
(3) 12.29 ft on 03/23/2011
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 9.53 ft on 04/03/2020
(2) 12.39 ft on 03/28/2019
(3) 10.93 ft on 04/23/2018
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.
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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.
Flood Impacts & Photos Collapse
If you notice any errors in the below information, please contact our Webmaster
18 479th Avenue begins to flood south of Castlewood.
17 Highway 22 begins to flood, as does 181st Street, and water reaches the bottom of the bridge on 459th Avenue south of Castlewood.
16 The river will be about 1 mile wide and many farm buildings around Castlewood will be flooded
15 The water reaches the bottom of the bridges on Highway 22 and 181st Street.
13 Major agricultural flooding begins south of Castlewood.
11 Significant amounts of pasture and other agricultural lands will be flooded
10 184th Street begins to flood.
9 Water overtops the culvert on 184th Street and significant agricultural flooding begins north of Castlewood.
8 Minor flooding of low-lying agricultural lands along the river will begin
8 Minor flooding of low-lying agricultural lands along the river will begin

Other Real-time and/or Archive Data Sources:

Additional Information Collapse
Effective on Friday, June 1 2012, the Minor Flood Stage has been changed to 9.0 feet, and the Moderate Flood Stage changed to 11.0 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
Aberdeen Weather Forecast Office
824 Brown County 14 South
Aberdeen, SD 57401
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Page last modified: 2-Nov-2020 7:29 PM
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