468
Recorded events
43
Counties affected
0
Direct deaths
$197.2M
Property damage
Idaho flood history: 468 recorded events across 43 counties between 1996 and 2026.
Decade by decade
Idaho flood history by decade
The 2010s are the busiest decade on record with 281 reported flood events across Idaho. Earlier decades are thinner because systematic reporting for this hazard expanded over time, not because the weather was calmer.
County ranking
Counties with the most flood events in Idaho
| Rank | County | Events | Deaths | Damage | Span |
|---|---|---|---|---|---|
| #1 | Kootenai County | 31 | 0 | $913K | 1999–2025 |
| #2 | Latah County | 25 | 0 | $1.4M | 2000–2026 |
| #3 | Shoshone County | 24 | 0 | $2.2M | 1996–2025 |
| #4 | Bonner County | 22 | 0 | $6.6M | 2006–2025 |
| #5 | Bannock County | 22 | 0 | $701K | 1997–2025 |
| #6 | Benewah County | 18 | 0 | $2.0M | 2008–2018 |
| #7 | Blaine County | 15 | 0 | $17.9M | 2006–2023 |
| #8 | Nez Perce County | 14 | 0 | $2.5M | 2011–2023 |
| #9 | Bonneville County | 14 | 0 | $389K | 1997–2025 |
| #10 | Madison County | 13 | 0 | $1.6M | 2006–2025 |
| #11 | Boundary County | 13 | 0 | $584K | 2006–2025 |
| #12 | Ada County | 13 | 0 | $4.0M | 1998–2023 |
| #13 | Jefferson County | 10 | 0 | $3.2M | 2011–2023 |
| #14 | Washington County | 10 | 0 | $2.0M | 1999–2019 |
| #15 | Bingham County | 10 | 0 | $1.2M | 1997–2019 |
| #16 | Fremont County | 9 | 0 | $255K | 1997–2022 |
| #17 | Custer County | 8 | 0 | $4.8M | 2010–2023 |
| #18 | Bear Lake County | 8 | 0 | $1.0M | 2011–2017 |
| #19 | Lemhi County | 8 | 0 | $120K | 2009–2026 |
| #20 | Butte County | 8 | 0 | $530K | 2017–2019 |
| #21 | Caribou County | 8 | 0 | $2.0M | 2011–2023 |
| #22 | Clark County | 7 | 0 | $760K | 2011–2025 |
| #23 | Canyon County | 7 | 0 | $1.5M | 2012–2023 |
| #24 | Owyhee County | 6 | 0 | $0 | 1998–2023 |
| #25 | Boise County | 6 | 0 | $100K | 1998–2023 |