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Millstone River at Griggstown — water level right now

Somerset County, New Jersey · NWS gauge GTNN4
Loading the latest reading…
–
current stage (ft)
 
10
minor flood stage
 
24.21
record crest
set 2011-08-28
–
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 · 9.5
minor · 10
moderate · 12
major · 15
Flood stageLevel (ft)What it means
Major flood stage15extensive inundation and significant evacuations — a serious event
Moderate flood stage12some buildings and roads inundated; evacuations possible
Minor flood stage10low-lying roads and fields near the river start to flood
Action stage9.5water is approaching flood level — time to pay attention

Highest floods on record here

#Crest (ft)Datevs. minor flood stage
124.212011-08-28+14.21 above
223.362021-09-02+13.36 above
323.21999-09-16+13.2 above
422.71971-08-28+12.7 above
522.162007-04-16+12.16 above
6191938-09-22+9 above
718.652010-03-14+8.65 above
818.562014-05-01+8.56 above
9181996-10-19+8 above
1017.242021-08-23+7.24 above
1116.492023-12-19+6.49 above
1216.292018-05-28+6.29 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

Millstone River at Blackwells Mills 3 mi away · loading… Pike Run at Belle Mead 3 mi away · loading… Millstone River at Millstone 5 mi away · loading… Millstone River at Weston 6 mi away · loading… Raritan River at Bound Brook 8 mi away · loading… Raritan River at Manville 8 mi away · loading…

Gauge details

NWS gauge IDGTNN4
USGS site01401750
CountySomerset
StateNew Jersey
NWS forecast officeMount Holly
River forecast centerMiddle Atlantic River Forecast Center
Coordinates40.44, -74.617
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 Millstone River at Griggstown

Is Millstone River at Griggstown 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 10 ft. Blue means normal, yellow is action stage, orange minor, red moderate and dark red major flooding.

What is flood stage for Millstone River at Griggstown?

major flood stage 15 ft, moderate flood stage 12 ft, minor flood stage 10 ft, action stage 9.5 ft. These are official National Weather Service thresholds set specifically for this gauge, not generic values.

What is the record flood at Millstone River at Griggstown?

The highest crest on file at this gauge is 24.21 ft, reached on 2011-08-28 — that is 14.21 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.