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 Big Sioux River near Watertown would go into flood around mid-day on August 6th, reaching 10.65 feet, or 0.65 feet above flood stage on the evening of the 6th. This portion of the river would remain in flood through the morning of the 7th. Flooding would mainly impact agricultural lands.

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 Florence (45.1200, -97.2000).

Source: NOAA Storm Events Database, event 1290201. Narratives are written by the National Weather Service forecast office that issued the report.

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