Flood in Hamlin County, South Dakota

Flood August 6, 2025 – August 10, 2025 · Hamlin 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 Castlewood entered flood stage around mid-day on August 6th. The river would crest at 1030 pm on August 7th at 10.63 feet, or 1.63 feet above flood stage. The river stayed in flood through the morning of August 10th. Flooding was mainly confined to low-lying agricultural lands north of Castlewood, though a portion of 184th street flooded.

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 Castlewood (44.8000, -97.0300).

Source: NOAA Storm Events Database, event 1290194. Narratives are written by the National Weather Service forecast office that issued the report.

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