269
Recorded events
3
Direct deaths
1
Direct injuries
$17.5M
Property damage
Flash Flood in Bergen County, New Jersey: 269 recorded events between 1996 and 2025. The strongest on record measured 0. That places the county #18 nationally and #1 statewide for this hazard.
Decade by decade
Flash Flood in Bergen County, New Jersey: events per decade
Reporting practice changed over time — early decades are undercounted, not calmer.
The busiest decade for flash flood in Bergen County is the 2010s, when 104 of the county's 269 recorded events were logged. Comparing decades is useful for spotting active periods, but the earliest years are thin because systematic reporting for this hazard began later.
Within the Bergen County archive, flash flood makes up 30.0% of all recorded severe weather across 8 hazard types. Nationally the county sits at #18 for this hazard and #1 within New Jersey, putting it in the 99.5 percentile of all U.S. counties.
Seasonality
Events by month
Jul is the peak month for flash flood in Bergen County with 78 recorded events, while Feb is the quietest. Seasonality here is a property of the archive as much as the climate: reports cluster where population and spotter networks are densest.
Significant events
Deadliest on record
| Date | Location | Scale | Deaths | Injuries | Damage |
|---|---|---|---|---|---|
| Sep 16, 1999 | COUNTYWIDE | 0 | 2 | 0 | $17.5M |
| Sep 2, 2021 | MAHWAH | 0 | 1 | 0 | $0 |
| Jul 11, 2007 | GLEN ROCK | 0 | 0 | 1 | $0 |
Most recent
Latest recorded events
| Date | Location | Magnitude | Damage |
|---|---|---|---|
| Jul 14, 2025 | CAMPGAW | 0 | $0 |
| Jul 14, 2025 | BOGOTA | 0 | $0 |
| Aug 18, 2024 | EAST RUTHERFORD | 0 | $0 |
| Aug 18, 2024 | KINGSLAND | 0 | $0 |
| Aug 18, 2024 | LODI | 0 | $0 |
| Aug 6, 2024 | MAYWOOD | 0 | $0 |
| Aug 6, 2024 | COYTESVILLE | 0 | $0 |
| Aug 6, 2024 | COYTESVILLE | 0 | $0 |
| Aug 6, 2024 | COYTESVILLE | 0 | $0 |
| Aug 3, 2024 | WOODCLIFF LAKE | 0 | $0 |
Other hazards here
More from Bergen County
- Thunderstorm Wind 352
- Flood 107
- Hail 82
- Lightning 52
From the record
What the reports say
Written by National Weather Service staff at the time of the event · public domain
The Pascack River at Westwood rose above its minor flood stage of 5.0 feet at 9:45pm EDT. It then continued to rise, surpassing moderate flood stage (6.0 feet) by 1:00am EDT September 2nd and major flood stage (6.5 feet) at 3:15am EDT. The river crested at a height of 7.42 feet at 5:15am EDT September 2nd. The river receded throughout the morning, falling back below flood stage at 11:15am EDT September 2nd.
The Hackensack River at New Milford rose above its minor flood stage of 6.0 feet at 11:15pm EDT. It then continued to quickly rise to moderate flood stage (8.0 feet) by 1:30am EDT September 2nd. The river ultimately rose above major flood stage (10.0 feet) at 5:00am EDT before cresting at a height of 11.03 feet at 9:15am EDT September 2nd. Thereafter the river gradually receded, falling below flood stage at 7:30am EDT September 3rd.||The crest of 11.03 feet is the third highest on record behind crests of 12.36 feet in April 2007 and 11.45 feet in September 1999.
The Hackensack River at River Vale exceeded its minor flood stage of 5.5 feet at 11:30pm EDT. The river then continued to rise quickly, surpassing moderate flood stage (6.5 feet) by 12:15am EDT September 2nd and major flood stage (8.0 feet) by 12:30am EDT. The river then crested at a height of 11.05 feet at 4:00am EDT September 2nd. After falling through much of the morning, the river experienced a secondary crest of 10.73 feet at 3:45pm EDT September 2nd. The river did not fall back below flood stage until 11:45am EDT on September 3rd.||The crest of 11.05 feet is the third highest on record at this location behind crests of 12.26 feet in August 2011 and 12.19 feet in April 2007.
Quick answers
Frequently asked
How many flash flood events are on record in Bergen County, New Jersey?
269 flash flood events are recorded in Bergen County between 1996 and 2025, causing 3 direct deaths.
What is the strongest flash flood recorded in Bergen County?
The strongest flash flood on record in Bergen County measured 0.
Where does the flash flood data for Bergen County come from?
All events come from the NOAA/NCEI Storm Events Database, the federal public-domain archive of severe weather reports. Dates are UTC, damage is as reported and not inflation-adjusted, and the most recent entries may still be revised.
Cite this page
“Flash Flood in Bergen County, New Jersey.” Severe Weather History. severeweatherhistory.com/county/new-jersey/bergen-county/flash-flood/ · Data: NOAA/NCEI, FEMA, U.S. Census — public domain.