Stony Brook at Watchung NJ

Somerset County, New Jersey · USGS gauge 01403540 · NWS WTCN4 · New Jersey river levels

Nearby: river levels near Rahway · river levels near Manville

Is Stony Brook at Watchung NJ flooding right now?

Stony Brook at Watchung NJ measured 9.53 ft on 2026-09-11 01:30:00 UTC. That observation was 4.5 ft below its 14 ft flood stage. This is the latest available reading, not a guarantee of current conditions.

Gauge height

9.53 ft

as of 40 min ago

Streamflow

2 cfs

data refreshed 8 min ago

Minor flooding here begins at 14 ft. The highest crest on record was 24.5 ft on Thu, Aug 2, 1973.

Streamflow outlook

NOAA National Water Model forecast, issued 14 hours ago. The NWM models discharge for every river reach in the country, including the many gauges the National Weather Service does not forecast individually. It is a model, not an official NWS river forecast, and it predicts flow rather than water level.

Flood stages at this gauge

Category	Stage	Current distance
Action	14 ft	4.5 ft below
Minor flood	14 ft	4.5 ft below

New to these numbers? What does flood stage mean? · How to read a river gauge · Why is the river rising?

Highest crests on record

Stage	Date
24.5 ft	1973-08-02
20.4 ft	1975-07-14
17.16 ft	1999-09-16
15.27 ft	1996-10-19
15.24 ft	2007-04-27

Nearby gauges

Gauge	Distance	County
East Br Stony Brook at Best Lake at Watchung NJ	0.3 mi	Somerset County
Stony Brook at North Plainfield NJ	1.3 mi	Somerset County
Green Brook at Plainfield NJ	1.8 mi	Somerset County
Green Brook at Rock Avenue at Plainfield NJ	2.4 mi	Somerset County
Green Brook at Seeley Mills NJ	3.2 mi	Somerset County

Provisional data: Real-time readings are provisional and subject to revision by the USGS — sensors can be affected by ice, debris, or equipment malfunction. Do not rely on this site for decisions involving personal safety; follow official guidance from the National Weather Service and local authorities.

Sources: USGS monitoring location · NWS gauge & forecast