TornadoLiveMap

North Branch Raritan River at South Branch — water level right now

Somerset County, New Jersey · NWS gauge SBRN4
Loading the latest reading…
–
current stage (ft)
 
8
minor flood stage
 
20.26
record crest
set 2021-09-02
–
flood status
official NWS category
Official NOAA forecast → USGS data → Full US flood map →

Flood stages at this gauge

Where the water stands right now against the four official thresholds:

action · 7
minor · 8
moderate · 9
major · 11
Flood stageLevel (ft)What it means
Major flood stage11extensive inundation and significant evacuations — a serious event
Moderate flood stage9some buildings and roads inundated; evacuations possible
Minor flood stage8low-lying roads and fields near the river start to flood
Action stage7water is approaching flood level — time to pay attention

Highest floods on record here

#Crest (ft)Datevs. minor flood stage
120.262021-09-02+12.26 above
218.981999-09-16+10.98 above
3181896-02-06+10 above
417.692011-08-28+9.69 above
516.451955-08-19+8.45 above
615.61996-10-19+7.6 above
714.312007-04-16+6.31 above
814.282024-01-10+6.28 above
913.911996-01-19+5.91 above
1013.782023-12-18+5.78 above
1113.522014-05-01+5.52 above
1211.572023-12-28+3.57 above

Historic crests recorded at this gauge by the National Weather Service — the 12 highest on file.

Where this gauge is

The marker is this gauge; nearby gauges load live and are clickable.

Nearby river gauges

North Branch Raritan River near Raritan 1 mi away · loading… North Branch Raritan River at North Branch Village 3 mi away · loading… Lamington (Black) River at Burnt Mills 5 mi away · loading… Raritan River at Manville 5 mi away · loading… Middle Brook at Burnt Mills 6 mi away · loading… Millstone River at Millstone 6 mi away · loading…

Gauge details

NWS gauge IDSBRN4
USGS site01400010
CountySomerset
StateNew Jersey
NWS forecast officeMount Holly
River forecast centerMiddle Atlantic River Forecast Center
Coordinates40.557, -74.687
Time zoneEST5EDT
Turn Around, Don't Drown. Six inches of moving water can knock you off your feet and twelve inches can float a car. Never drive around barricades or into water of unknown depth — most flood deaths happen in vehicles.

Questions about North Branch Raritan River at South Branch

Is North Branch Raritan River at South Branch flooding right now?

The live reading at the top of this page answers that: the gauge is compared against its official NWS flood stages every 15 minutes. Minor flooding at this gauge begins at 8 ft. Blue means normal, yellow is action stage, orange minor, red moderate and dark red major flooding.

What is flood stage for North Branch Raritan River at South Branch?

major flood stage 11 ft, moderate flood stage 9 ft, minor flood stage 8 ft, action stage 7 ft. These are official National Weather Service thresholds set specifically for this gauge, not generic values.

What is the record flood at North Branch Raritan River at South Branch?

The highest crest on file at this gauge is 20.26 ft, reached on 2021-09-02 — that is 12.26 ft above minor flood stage. The full list of the highest crests is in the table on this page.

Where does this data come from?

From the NOAA National Water Prediction Service, the official U.S. river gauge network — a U.S. government work in the public domain. Live stage is refreshed every 15 minutes; flood thresholds and historic crests are refreshed monthly. For life-safety decisions follow NWS Mount Holly and local emergency management.