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Flood in Codington County, South Dakota
Flood August 23, 2025 · Codington County, South Dakota
Where the report was made, with tornadoes recorded within 15 miles over the years.
What the National Weather Service wrote
The Big Sioux River at Watertown Sioux Conifer Road gauge briefly hit flood stage for a few hours on the morning of August 23rd.
The wider storm
Storms moved over portions of northeast South Dakota that had really no extra room for moisture from the preceding months of nearly constant rainfall. Thus, this moisture went straight into the Big Sioux and tributaries from the Watertown area down south to Castlewood. The COOP observer in Rauville would record 1.51 inches of rainfall pushing their monthly total up to 5.73 and a 3 month total of 23.32. The Watertown COOP would likewise come up with 1.86 inches, putting the monthly total at 5.85 and 20.1 for the preceding 3 months. Even Castlewood, while only topping out at 0.31 inches, would see their monthly total top out at 4.99 inches with a 3 month total of 22 inches.
Began near Rauville (44.9800, -97.1300).
Source: NOAA Storm Events Database, event 1291980. Narratives are written by the National Weather Service forecast office that issued the report.
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