Flood in Grant County, South Dakota

Flood August 6, 2025 – August 7, 2025 · Grant County, South Dakota

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

What the National Weather Service wrote

The river crested at 1059.7 feet, or 3.7 feet above flood stage, at 2:00 p.m. CST on August 7th. At its peak, the water reached just shy of the bottom of the bridges on 145th Street and 480th Avenue. The low water crossing on 479th Avenue was flooded, along with nearby agricultural lands.

The wider storm

Heavy thunderstorm rainfall of 2 to 4 inches on saturated soils resulted in flooding of the North Fork Whetstone River near Milbank late on the evening of August 6th.

Began near Milbank Arpt (45.2800, -96.5700).

Source: NOAA Storm Events Database, event 1290215. Narratives are written by the National Weather Service forecast office that issued the report.

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