Flood in Lewis and Clark County, Montana

Flood April 9, 2023 – April 11, 2023 · Lewis and Clark County, Montana

$100K

Damage as recorded

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

What the National Weather Service wrote

Lewis and Clark County Sheriff's Office reported the high bridge over the Dearborn River was washed out. Public works closed the road at Flat Creek. Several secondary roads across the area were flooded at times. Flooding across northwest Helena also occurred, especially west of Birdseye 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 Birdseye (46.6323, -112.1494).

Source: NOAA Storm Events Database, event 1096958. Narratives are written by the National Weather Service forecast office that issued the report.

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