FloodZoneMap.org

Flash Flood — Jefferson, MT

Jun 27, 2023

An unstable airmass with a minor weather disturbance resulted in afternoon showers and thunderstorms, with locally severe weather occurring. Isolated locations also experienced flooding, such as portions of Jefferson County where Milligan Canyon Road was washed out in several locations.

Source: NOAA National Weather Service Storm Events Database (event 1109200). Narrative written by NWS staff at the time of the event.

Flood Risk Context for Jefferson, MT

This event is one of many recorded floods in Jefferson County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.

View Jefferson County flood data →

More Flood Stories

Flood

Jefferson, MT · Jul 29, 2025

A persistent troughing pattern brought in good instability and shear to produce severe thunderstorms across the region over the 3 day time frame with strong winds as the primary hazard. There was also isolated large hail.

Read the full account →
Flood

Jefferson, MT · May 10, 2018

As a low pressure center aloft consolidated over Washington state, isolated showers and thunderstorms developed over north-central and southwest Montana during the afternoon and early evening of May 10th, 2018. This was especially the case over and near higher terrain.

Read the full account →
Flood

Jefferson, MT · May 10, 2018

As a low pressure center aloft consolidated over Washington state, isolated showers and thunderstorms developed over north-central and southwest Montana during the afternoon and early evening of May 10th, 2018. This was especially the case over and near higher terrain.

Read the full account →
Flood3 deaths

West Glacier Region, MT · Jun 4, 1996

Major damage from flooding occurred mainly in Ravalli County were numerous roads were flooded and washed out. The worst road damage occurred on the Skalkaho Highway between the Bitterroot Valley and the Philipsburg/Anaconda area were water was diverted into the road in several…

Read the full account →