Major Flood
15 ft
Current Water Level
Gage Height
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Streamflow
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Last Reading
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FLOOD STAGES
Know the flood categories.
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
Moderate Flood
12 ft
Minor Flood
10 ft
Action Stage
8 ft
What Floods at Each Level
20 ft
US Route 202 is closed. Flooding extends west of Vanderveer Avenue to Burnt Mill Road.
19 ft
The bridge on Old York Road between Branchburg and Bridgewater is closed due to flooding.
18 ft
Helfreds Landing in Bridgewater floods.
15 ft
US Route 202 in Branchburg begins to flood, starting with the northbound lanes. Chambers Brook experiences back water causing flooding to occur along Chambers Brook Road.
14 ft
The first evacuations begin in Branchburg near Route 28 and Vaanderveer Avenue.
12 ft
Vaanderveer Avenue in Branchburg begins to flood.
10 ft
Flooding begins along Old York Road and in Branchburg.
8 ft
North Branch Park floods.
Impact statements from the National Weather Service, describing what typically happens at each water level.
7-Day Water Level Chart
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Historic Crests
| Date | Stage | Flow |
|---|---|---|
| Sep 2, 2021 | 19.52 ft | 33,980 cfs |
| Sep 15, 1999 | 18.98 ft | 29,000 cfs |
| Aug 28, 2011 | 17.97 ft | 40,600 cfs |
About This Gauge
USGS Site
NWS LID
RRTN4
River
North Branch Raritan River
County
Somerset, NJ
Coordinates
40.5706°N, 74.6792°W
Get Flood Alerts for North Branch Raritan River
StormCast monitors this gauge and sends a push notification to your phone when the water level crosses into a new flood category — even at 3 AM.
Frequently Asked Questions
What is the current water level of North Branch Raritan River near Raritan?
The North Branch Raritan River near Raritan gauge is maintained by USGS (site 01400000) and reports water levels every 15 minutes. Visit this page to see the latest reading updated live, or download StormCast to get push alerts when levels rise.
What is flood stage for North Branch Raritan River near Raritan?
The NWS-defined flood stage for North Branch Raritan River near Raritan is 10 feet. Action stage begins at 8 feet. Moderate flooding starts at 12 feet, and major flooding at 15 feet.
How do I get alerts when North Branch Raritan River rises?
Download StormCast free on Google Play, go to River Gauges, and add North Branch Raritan River near Raritan to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category.
Where is the North Branch Raritan River near Raritan gauge located?
The gauge is located in Somerset County, New Jersey at coordinates 40.5706°N, 74.6792°W. USGS site number: 01400000. Data is provided by the U.S. Geological Survey and the National Weather Service.
More Gauges on North Branch Raritan River
On This River
Upstream: North Branch Raritan River at North Branch Village
Downstream: North Branch Raritan River at South Branch
More Resources
Source & Notes
Data provided by: US Geological Survey, Observations courtesy of U.S. Geological Survey
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