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This probabilistic forecast is issued by the Missouri Basin River Forecast Center.
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Experimental Short Range Forecast Uncertainty (AHPS) - External Links: Product Description Document | Customer Survey
About this graph
Forecasts for the Big Sioux River near Watertown are issued as needed during times of high water, but are not routinely available.

Vertical Datum updated from NGVD29 to NAVD88 by gauge owner.

Return to Area Map

Zoom Level:14
Flood Categories (in feet)
Major Flood Stage: 12
Moderate Flood Stage: 11
Flood Stage: 10
Action Stage: 9
Low Stage (in feet): -9999

Historic Crests
(1) 12.33 ft on 04/07/2001
(2) 12.09 ft on 04/05/1997
(3) 11.21 ft on 03/28/2019
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 8.78 ft on 10/23/2019
(2) 11.21 ft on 03/28/2019
(3) 7.88 ft on 09/25/2017
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
20 The bridge at the gaging location is overtopped
19 The bridge 1 mile south of the gage is overtopped
16 The water reaches the bottom of the bridge at the gage and the bridge 1 mile south of the gage
13 Flooding begins to affect the city of watertown and the sidewalk on the highway 81 bridge is overtopped
12.5 County roads begin to flood
11.5 Significant amounts of pasture and crop land are flooded
9 The lowest banks are overtopped and minimal areas of pasture land will be flooded

Other Real-time and/or Archive Data Sources:
Additional Information Collapse
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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