Flood in Sioux County, Iowa

Flood July 30, 2025 – July 31, 2025 · Sioux County, Iowa

Where the report was made, with tornadoes recorded within 15 miles over the years.

What the National Weather Service wrote

The Floyd River at Alton rose above flood stage on the evening of July 30th, cresting around 1.46 feet above flood stage (13.46 ft) on July 31st. The river then fell below flood stage on the afternoon of July 31st.

The wider storm

A wet period at the end of the July resulted in saturated soils and increased runoff, allowing for isolated river flooding through portions of the Floyd River Basin. The sharpest rises were observed with a heavy rain on the night of July 29 into the morning of July 30.

Began near Newkirk (43.0700, -95.9600).

Source: NOAA Storm Events Database, event 1288695. Narratives are written by the National Weather Service forecast office that issued the report.

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