88
Recorded events
0
Direct deaths
0
Direct injuries
$266.0M
Property damage
Flood in Somerset County, New Jersey: 88 recorded events between 2002 and 2025. The strongest on record measured 0. That places the county #79 nationally and #2 statewide for this hazard.
Decade by decade
Flood in Somerset County, New Jersey: events per decade
Reporting practice changed over time — early decades are undercounted, not calmer.
The busiest decade for flood in Somerset County is the 2010s, when 53 of the county's 88 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 Somerset County archive, flood makes up 14.2% of all recorded severe weather across 8 hazard types. Nationally the county sits at #79 for this hazard and #2 within New Jersey, putting it in the 97.4 percentile of all U.S. counties.
Seasonality
Events by month
Mar is the peak month for flood in Somerset County with 13 recorded events, while May 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.
Most recent
Latest recorded events
| Date | Location | Magnitude | Damage |
|---|---|---|---|
| Jul 15, 2025 | BOUND BROOK | 0 | $0 |
| Jan 10, 2024 | SOMERVILLE ARPT | 0 | $0 |
| Dec 28, 2023 | FAR HILLS | 0 | $0 |
| Dec 18, 2023 | PLUCKEMIN | 0 | $0 |
| Apr 17, 2018 | BOUND BROOK JCT | 0 | $0 |
| Apr 17, 2018 | CAMP KILMER | 0 | $0 |
| Apr 16, 2018 | MILLSTONE | 0 | $0 |
| Mar 3, 2018 | MILLSTONE | 0 | $0 |
| Oct 30, 2017 | GREEN BROOK | 0 | $10 |
| Aug 23, 2017 | GREEN BROOK | 0 | $0 |
Other hazards here
More from Somerset County
- Thunderstorm Wind 323
- Flash Flood 88
- Hail 43
From the record
What the reports say
Written by National Weather Service staff at the time of the event · public domain
Runoff from heavier rain and snow melt in Morris and Hunterdon Counties caused flooding along part of the North Branch of the Raritan River. The North Branch of the Raritan River at the village of South Branch was above its 7 foot flood stage from 923 a.m. EST through 250 p.m. EST on the 5th. It crested at 7.5 feet at 1145 a.m. EST. Precipitation event storm totals included 1.59 inches in Clinton (Hunterdon County), 1.02 inches in Far Hills (Somerset County) and 0.93 inches in Somerville (Somerset County).
Runoff from the heavier rain that fell earlier in the day on the 28th in Hunterdon and Morris Counties caused minor flooding around the confluence of the North and South Branches of the Raritan River later in the day on the 28th. The North Branch of the Raritan River at the village of South Branch was above its 7 foot flood stage from 135 p.m. EDT through 830 p.m. EDT on the 28th. It crested at 7.46 feet at 630 p.m. EDT.
The runoff from waves of heavy precipitation caused minor to moderate flooding along the Millstone River that lasted through the night of March 31st and persisted at Griggstown into the late afternoon of April 1st. The flooding forced the closure of the Griggstown Causeway and Blackwells Mills Road across the Millstone River as well as sections of Millstone River Road in Franklin and Montgomery Townships. Moderate flooding occurred along the Millstone River at Griggstown, and it was above its 10 foot flood stage from 145 a.m. EDT on March 30th through 435 p.m. EDT on April 1st. It crested at 13.78 feet at 1145 p.m. EDT on March 30th. Event precipitation totals included 3.48 inches in Franklin Township, 3.30 inches in Blackwells Mills, 3.28 inches in Hillsborough Township, 2.99 inches in Montgomery Township, 2.78 inches in Bridgewater Township, and 2.43 inches at the Somerville Airport.
Quick answers
Frequently asked
How many flood events are on record in Somerset County, New Jersey?
88 flood events are recorded in Somerset County between 2002 and 2025, causing 0 direct deaths.
What is the strongest flood recorded in Somerset County?
The strongest flood on record in Somerset County measured 0.
Where does the flood data for Somerset 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
“Flood in Somerset County, New Jersey.” Severe Weather History. severeweatherhistory.com/county/new-jersey/somerset-county/flood/ · Data: NOAA/NCEI, FEMA, U.S. Census — public domain.