Flood in Chouteau County, Montana

Flood April 11, 2023 – April 13, 2023 · Chouteau County, Montana

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

What the National Weather Service wrote

Chouteau County Sheriff's Office reported flood-related closures in Big Sandy at North Lonesome Lake Road between Ihmsen Well Road and Gardiner Road and from Black Coulee Road to Rudyard Road.

The wider storm

Unseasonably warm temperatures occurred in the first two weeks of April, with highs near 80 degrees occurring at times. These warm temps, along with occasional rain, resulted in melting of a deep snowpack on top of frozen ground which led to significant runoff into area waterways. Moderate to major flooding occurred along portions of the Milk River and its tributaries. Impactful snowmelt flooding also occurred across Southcentral Montana, in particular across the Gallatin Valley.

Began near Big Sandy Arpt (48.1551, -110.1650).

Source: NOAA Storm Events Database, event 1096961. Narratives are written by the National Weather Service forecast office that issued the report.

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