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Flood in Madison County, Idaho
19 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.
Madison County, Idaho, has 19 flood events in the NCEI record since 1950, with at least one in 10 different years.
May is the busiest month, with 4 of the recorded events. The last 20 years account for 16 events against 3 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 2.4% of the 790 flood events recorded in Idaho; its 4.0 per 100 square miles compares with 1.0 statewide.
Compared with Idaho
| Measure | Madison County | Idaho | US |
|---|---|---|---|
| Flood events since 1950 | 19 | 790 | 183,559 |
| Per 100 square miles | 4.0 | 1.0 | 5.2 |
| Per 10,000 residents | 3.5 | 4.2 | 5.5 |
| Deaths recorded | 0 | 3 | 2,961 |
| Busiest month | May | June | June |
By year
Seasonality
0Feb
3Mar
3Apr
2May
4Jun
4Jul
3Aug
0Sep
0Oct
0Nov
0Dec
0
Recorded events
All 19 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 |
|---|---|---|---|---|---|---|---|
| 11 Mar 2025 | Flood | — | $10K | — | — | — | County |
| 23 May 2023 | Flash Flood | — | $150K | — | — | — | County |
| 10 Apr 2023 | Flood | — | $100K | — | — | — | County |
| 17 Jun 2018 | Flash Flood | — | — | — | — | — | County |
| 14 Mar 2018 | Flood | — | $1.3M | — | — | — | County |
| 1 Jun 2017 | Flash Flood | — | $12K | — | — | — | County |
| 1 May 2017 | Flood | — | $36K | — | — | — | County |
| 2 Apr 2017 | Flood | — | — | — | — | — | County |
| 1 Mar 2017 | Flood | — | $15K | — | — | — | County |
| 6 Feb 2017 | Flood | — | $148K | — | — | — | County |
| 15 Jul 2014 | Flash Flood | — | $600K | — | — | — | County |
| 22 Feb 2012 | Flood | — | — | — | — | — | County |
| 1 Jul 2011 | Flood | — | — | — | — | — | County |
| 1 Jun 2011 | Flood | — | $2K | — | — | — | County |
| 15 May 2011 | Flood | — | — | — | — | — | County |
| 1 Jun 2008 | Flood | — | — | — | — | — | County |
| 19 May 2006 | Flood | — | — | — | — | — | County |
| 28 Feb 2006 | Flash Flood | — | $357K | — | — | — | County |
| 22 Jul 2004 | Flash Flood | — | $8K | — | — | — | County |
Questions and answers
How many flood events has Madison County had?
19 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 Madison County?
11 Mar 2025 (Flood). Records reach NCEI about 120 days after the month ends.
What was the most damaging flood event recorded in Madison County?
The flood of 14 Mar 2018, with property damage estimated by NCEI at $1.3M.
How does Madison County compare with Idaho for flood?
4.0 events per 100 square miles against 1.0 statewide; the county holds 19 of the state's 790 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.