Flood in Codington County, South Dakota

Flood August 6, 2025 – August 7, 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 portion of the Big Sioux River at Watertown Sioux Conifer Road went into flood at 845 am CST August 7th, cresting at 9.15 feet, or 0.15 feet above flood stage. The river fell below flood at 9 pm CST August 7th with the flooding primarily limited to low spots.

The wider storm

Heavy rainfall of 2 to 4 inches across Codington and Hamlin counties, falling on already saturated soils due to above normal precipitation through the spring and summer months, resulted in flooding of the Big Sioux River and its tributaries including Mud and Willow Creeks. Flooding would mainly be limited to low spots and agricultural lands, however.

Began near Rauville (44.9800, -97.1300).

Source: NOAA Storm Events Database, event 1290202. Narratives are written by the National Weather Service forecast office that issued the report.

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