Apr 9, 2023
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.
Source: NOAA National Weather Service Storm Events Database (event 1096958). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Lewis And Clark County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.