States › Montana › Roosevelt County › Flood
Flood in Roosevelt County, Montana
51 floods and flash floods events in the NCEI Storm Events record, 1950 to 2026. Event types counted: Flood, Flash Flood, Coastal Flood, Lakeshore Flood.
NCEI notes that Storm Data is compiled from a variety of sources including the National Weather Service, other federal, state and local agencies, the media and the public; that property and crop damage figures are estimates; and that some events are recorded by NWS forecast zone rather than by county. FEMA notes that NFIP claim records are redacted and aggregated to protect the privacy of policyholders. Storm records through 30 Jun 2026.
Roosevelt County, Montana, has 51 flood events in the NCEI record since 1950, with at least one in 19 different years.
March is the busiest month, with 16 of the recorded events. The last 20 years account for 27 events against 24 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 4.3% of the 1,175 flood events recorded in Montana; its 2.2 per 100 square miles compares with 0.8 statewide.
Compared with Montana
| Measure | Roosevelt County | Montana | US |
|---|---|---|---|
| Flood events since 1950 | 51 | 1,175 | 183,559 |
| Per 100 square miles | 2.2 | 0.8 | 5.2 |
| Per 10,000 residents | 47.1 | 10.6 | 5.5 |
| Deaths recorded | 0 | 9 | 2,961 |
| Busiest month | March | June | June |
By year
Seasonality
0Feb
0Mar
16Apr
3May
2Jun
12Jul
15Aug
3Sep
0Oct
0Nov
0Dec
0
Recorded events
All 51 events, most recent first. Magnitude is hail size, tornado rating or wind speed as recorded.
| Date | Event type | Magnitude | Property damage | Crop damage | Deaths | Injuries | Geography |
|---|---|---|---|---|---|---|---|
| 27 Jun 2026 | Flash Flood | — | — | — | — | — | County |
| 27 Jun 2026 | Flash Flood | — | — | — | — | — | County |
| 11 Apr 2023 | Flood | — | — | — | — | — | County |
| 8 Jun 2021 | Flash Flood | — | — | — | — | — | County |
| 8 Jun 2021 | Flash Flood | — | — | — | — | — | County |
| 10 Mar 2020 | Flood | — | — | — | — | — | County |
| 1 Apr 2019 | Flood | — | — | — | — | — | County |
| 29 Mar 2019 | Flood | — | — | — | — | — | County |
| 22 Mar 2019 | Flood | — | — | — | — | — | County |
| 18 Mar 2017 | Flood | — | — | — | — | — | County |
| 16 Mar 2017 | Flood | — | — | — | — | — | County |
| 16 Mar 2017 | Flood | — | — | — | — | — | County |
| 16 Mar 2017 | Flood | — | — | — | — | — | County |
| 16 Mar 2017 | Flood | — | — | — | — | — | County |
| 16 Mar 2017 | Flood | — | — | — | — | — | County |
| 16 Mar 2017 | Flood | — | — | — | — | — | County |
| 16 Mar 2017 | Flood | — | — | — | — | — | County |
| 13 Mar 2015 | Flood | — | — | — | — | — | County |
| 11 Jul 2012 | Flash Flood | — | — | — | — | — | County |
| 22 Jul 2011 | Flash Flood | — | — | — | — | — | County |
| 1 Jul 2011 | Flood | — | — | — | — | — | County |
| 17 Jun 2011 | Flood | — | — | — | — | — | County |
| 12 Jun 2011 | Flood | — | — | — | — | — | County |
| 12 Jun 2011 | Flash Flood | — | — | — | — | — | County |
| 7 Jun 2011 | Flood | — | — | — | — | — | County |
| 5 Jun 2011 | Flood | — | — | — | — | — | County |
| 18 May 2011 | Flood | — | — | — | — | — | County |
| 24 May 2006 | Flash Flood | — | — | — | — | — | County |
| 13 Jun 2005 | Flash Flood | — | — | — | — | — | County |
| 11 Jul 2004 | Flash Flood | — | — | — | — | — | County |
| 7 Jul 2004 | Flash Flood | — | — | — | — | — | County |
| 17 Mar 2003 | Flash Flood | — | $115K | — | — | — | County |
| 7 Aug 2002 | Flash Flood | — | $100K | $50K | — | — | County |
| 21 Jul 2001 | Flash Flood | — | — | — | — | — | County |
| 17 Jul 2001 | Flash Flood | — | $30K | — | — | — | County |
| 10 Jul 2000 | Flash Flood | — | — | — | — | — | County |
| 20 Jun 1999 | Flash Flood | — | $25K | — | — | — | County |
| 9 Apr 1999 | Flash Flood | — | — | — | — | — | County |
| 17 Mar 1999 | Flood | — | — | — | — | — | Forecast zone |
| 17 Mar 1999 | Flood | — | — | — | — | — | Forecast zone |
| 15 Mar 1999 | Flood | — | — | — | — | — | County |
| 8 Jul 1998 | Flash Flood | — | — | — | — | — | County |
| 5 Jul 1998 | Flash Flood | — | $10K | — | — | — | County |
| 4 Jul 1998 | Flash Flood | — | — | — | — | — | County |
| 4 Jul 1998 | Flash Flood | — | — | — | — | — | County |
| 4 Jul 1998 | Flash Flood | — | $1.0M | $300K | — | — | County |
| 4 Jul 1998 | Flash Flood | — | — | — | — | — | County |
| 23 Jun 1998 | Flash Flood | — | $50K | $25K | — | — | County |
| 27 Aug 1997 | Flash Flood | — | — | — | — | — | County |
| 27 Aug 1997 | Flash Flood | — | — | — | — | — | County |
| 1 Jul 1997 | Flood | — | — | — | — | — | County |
Questions and answers
How many flood events has Roosevelt County had?
51 events in the NCEI Storm Events record between 1950 and 2026. Reporting of floods and flash floods became far more complete after 1996, so early decades undercount.
When was the last recorded flood event in Roosevelt County?
27 Jun 2026 (Flash Flood). Records reach NCEI about 120 days after the month ends.
What was the most damaging flood event recorded in Roosevelt County?
The flash flood of 4 Jul 1998, with property damage estimated by NCEI at $1.0M and crop damage at $300K.
How does Roosevelt County compare with Montana for flood?
2.2 events per 100 square miles against 0.8 statewide; the county holds 51 of the state's 1,175 recorded events.
Provenance
NOAA NCEI Storm Events Database, yearly details files through 30 Jun 2026, public domain. County-recorded events plus zone-recorded events whose forecast zone is named for the county (marked "Forecast zone"). Population and area from the US Census Bureau (2021). Built 1 Oct 2026. See the methodology, the Flood hub and the county page.