3,480
Recorded events
15
Counties affected
111
Direct deaths
$252.8M
Property damage
Arizona flash flood history: 3,480 recorded events across 15 counties between 1996 and 2025.
Decade by decade
Arizona flash flood history by decade
The 2010s are the busiest decade on record with 1,375 reported flash flood events across Arizona. 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 flash flood events in Arizona
| Rank | County | Events | Deaths | Damage | Span |
|---|---|---|---|---|---|
| #1 | Mohave County | 656 | 8 | $15.2M | 1996–2025 |
| #2 | Maricopa County | 580 | 15 | $57.4M | 1996–2025 |
| #3 | Pima County | 521 | 19 | $25.9M | 1996–2025 |
| #4 | Yavapai County | 318 | 5 | $10.8M | 1996–2025 |
| #5 | Coconino County | 278 | 24 | $32.0M | 1997–2025 |
| #6 | Gila County | 231 | 15 | $78.1M | 1996–2025 |
| #7 | Cochise County | 220 | 13 | $4.8M | 1996–2025 |
| #8 | Pinal County | 131 | 5 | $7.0M | 1996–2025 |
| #9 | La Paz County | 125 | 2 | $7.4M | 1996–2025 |
| #10 | Navajo County | 113 | 0 | $75K | 1997–2025 |
| #11 | Apache County | 98 | 0 | $241K | 1997–2024 |
| #12 | Santa Cruz County | 83 | 4 | $12.4M | 1997–2025 |
| #13 | Yuma County | 56 | 0 | $268K | 1996–2025 |
| #14 | Graham County | 49 | 1 | $806K | 1997–2024 |
| #15 | Greenlee County | 21 | 0 | $341K | 2001–2022 |
Significant events
Deadliest flash flood events in Arizona
| Date | County | Scale | Deaths | Injuries |
|---|---|---|---|---|
| Aug 12, 1997 | Coconino County | — | 11 | 1 |
| Jul 15, 2017 | Gila County | — | 10 | 0 |
| Aug 6, 1997 | Cochise County | — | 6 | 0 |
| Mar 29, 1998 | Maricopa County | — | 3 | 0 |
| Aug 4, 2008 | Pima County | — | 3 | 0 |
| Aug 11, 2001 | Coconino County | — | 3 | 0 |
| Sep 27, 2025 | Gila County | — | 3 | 0 |
| Aug 18, 2021 | Maricopa County | — | 2 | 0 |
| Aug 4, 2007 | Pima County | — | 2 | 0 |
| Sep 9, 2006 | Pinal County | — | 2 | 0 |