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Stony Brook at Princeton — water level right now

Mercer County, New Jersey · NWS gauge PCTN4
Loading the latest reading…
–
current stage (ft)
 
9
minor flood stage
 
16.23
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 · 8
minor · 9
moderate · 11
major · 14
Flood stageLevel (ft)What it means
Major flood stage14extensive inundation and significant evacuations — a serious event
Moderate flood stage11some buildings and roads inundated; evacuations possible
Minor flood stage9low-lying roads and fields near the river start to flood
Action stage8water is approaching flood level — time to pay attention

Highest floods on record here

#Crest (ft)Datevs. minor flood stage
116.232011-08-28+7.23 above
214.261971-08-28+5.26 above
314.021999-09-16+5.02 above
412.482021-08-22+3.48 above
512.271996-01-19+3.27 above
612.182014-05-01+3.18 above
711.91955-08-13+2.9 above
811.832018-05-27+2.83 above
911.481994-01-28+2.48 above
1011.321984-07-07+2.32 above
1110.72023-12-18+1.7 above
1210.552007-04-16+1.55 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

Assunpink Creek at Clarksville 4 mi away · loading… Assunpink Creek near Mercerville 6 mi away · loading… Assunpink Creek at Trenton 8 mi away · loading… Millstone River at Griggstown 8 mi away · loading… Delaware River at Trenton 9 mi away · loading… Pike Run at Belle Mead 9 mi away · loading…

Gauge details

NWS gauge IDPCTN4
USGS site01401000
CountyMercer
StateNew Jersey
NWS forecast officeMount Holly
River forecast centerMiddle Atlantic River Forecast Center
Coordinates40.333, -74.682
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 Stony Brook at Princeton

Is Stony Brook at Princeton 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 9 ft. Blue means normal, yellow is action stage, orange minor, red moderate and dark red major flooding.

What is flood stage for Stony Brook at Princeton?

major flood stage 14 ft, moderate flood stage 11 ft, minor flood stage 9 ft, action stage 8 ft. These are official National Weather Service thresholds set specifically for this gauge, not generic values.

What is the record flood at Stony Brook at Princeton?

The highest crest on file at this gauge is 16.23 ft, reached on 2011-08-28 — that is 7.23 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.