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Flood in Bonner County, Idaho
23 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.
NCEI records 23 flood events in Bonner County, Idaho, between 1950 and 2026, spread over 11 years.
March is the busiest month, with 6 of the recorded events. The last 20 years account for 21 events against 2 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 2.9% of the 790 flood events recorded in Idaho; its 1.3 per 100 square miles compares with 1.0 statewide.
Compared with Idaho
| Measure | Bonner County | Idaho | US |
|---|---|---|---|
| Flood events since 1950 | 23 | 790 | 183,559 |
| Per 100 square miles | 1.3 | 1.0 | 5.2 |
| Per 10,000 residents | 4.6 | 4.2 | 5.5 |
| Deaths recorded | 0 | 3 | 2,961 |
| Busiest month | March | June | June |
By year
Seasonality
1Feb
0Mar
6Apr
0May
5Jun
3Jul
1Aug
0Sep
0Oct
0Nov
1Dec
6
Recorded events
All 23 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 |
|---|---|---|---|---|---|---|---|
| 10 Dec 2025 | Flood | — | $20K | — | — | — | County |
| 6 Dec 2023 | Flood | — | $1K | — | — | — | County |
| 22 May 2020 | Flood | — | $10K | — | — | — | County |
| 20 May 2020 | Flood | — | — | — | — | — | County |
| 18 May 2018 | Flood | — | $3K | — | — | — | County |
| 11 May 2018 | Flood | — | $5K | — | — | — | County |
| 15 Mar 2017 | Flood | — | $2.0M | — | — | — | County |
| 9 Dec 2015 | Flood | — | — | — | — | — | County |
| 9 Dec 2015 | Flood | — | — | — | — | — | County |
| 9 Dec 2015 | Flood | — | — | — | — | — | County |
| 9 Dec 2015 | Flood | — | — | — | — | — | County |
| 9 Mar 2014 | Flood | — | $25K | — | — | — | County |
| 6 Jun 2012 | Flood | — | $15K | — | — | — | County |
| 6 Jun 2012 | Flood | — | — | — | — | — | County |
| 31 Mar 2012 | Flood | — | $70K | — | — | — | County |
| 30 Mar 2012 | Flood | — | $72K | — | — | — | County |
| 30 Mar 2012 | Flood | — | $550K | — | — | — | County |
| 29 Jan 2012 | Flood | — | — | — | — | — | County |
| 1 Jul 2011 | Flood | — | $20K | — | — | — | County |
| 17 Jun 2011 | Flood | — | $20K | — | — | — | County |
| 31 Mar 2011 | Flood | — | $1.8M | — | — | — | County |
| 7 Nov 2006 | Flood | — | $2.0M | — | — | — | County |
| 26 May 1998 | Flash Flood | — | $100K | — | — | — | County |
Questions and answers
How many flood events has Bonner County had?
23 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 Bonner County?
10 Dec 2025 (Flood). Records reach NCEI about 120 days after the month ends.
What was the most damaging flood event recorded in Bonner County?
The flood of 7 Nov 2006, with property damage estimated by NCEI at $2.0M.
How does Bonner County compare with Idaho for flood?
1.3 events per 100 square miles against 1.0 statewide; the county holds 23 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.