How high is the Rahway River at Rahway NJ right now?

The Rahway River at Rahway NJ is currently flowing at 17 cubic feet per second with a gage height of 1.48 feet, based on the most recent USGS instantaneous reading.

Is the flow on the Rahway River at Rahway NJ normal for this time of year?

Current flow is classified as normal for June 11. Today's discharge is at the 47th percentile compared to the long-term historical record at this gauge.

Is the Rahway River at Rahway NJ at flood stage?

No — the gage height is 4.52 feet below the NWS flood-stage threshold of 6.0 feet.

What is the historical median flow for the Rahway River at Rahway NJ on June 11?

The long-term median discharge for this date is 18 cfs based on USGS daily statistics. The 10th–95th percentile range historically is 5 to 130 cfs.

Where is the Rahway River at Rahway NJ stream gauge located?

The Rahway River at Rahway NJ stream gauge is operated by the USGS in Union County, NJ on the Rahway River. USGS site number 01395000 (coordinates 40.6189, -74.2833).

Rahway River at Rahway NJ

USGS Site No: 01395000 • Rahway River • Union County, NJ

Rahway River at Rahway NJ on the Rahway River is currently at 17 cfs (Normal — 47th percentile for this date) . Gage height: 1.48 ft.

Reading from 1 week ago

↑ Upstream on Rahway River

Rahway River Near Springfield NJ

CFS Discharge

1.48

Gage Height (ft)

Normal

Flow Condition

Normal

Flood Status

Historical Percentile Comparison

Today's discharge compared to the long-term record for June 11 at this station. Percentile rank shows what fraction of historical years had lower flow on this date.

Percentile	Label	CFS Threshold	Today's Flow
10th	Very Low threshold	5
25th	Low threshold	10
50th (Median)	Normal (median)	18	Today: 17 cfs
75th	High threshold	30
95th	Very High threshold	130

30-Day Hydrograph

Recent discharge plotted against the historical 10th–95th percentile envelope for the same calendar days. Source: USGS daily values + long-term statistics.

10th–95th historical Day-of-year median Recent discharge

30-Day Flow History

Date	Discharge (CFS)	Gage Ht (ft)
May 29, 2026	18	—
May 28, 2026	19	—
May 27, 2026	24	—
May 26, 2026	39	—
May 25, 2026	108	—
May 24, 2026	309	—
May 23, 2026	23	—
May 22, 2026	19	—
May 21, 2026	38	—
May 20, 2026	28	—
May 19, 2026	13	—
May 18, 2026	15	—
May 17, 2026	15	—
May 16, 2026	16	—
May 15, 2026	16	—
Apr 21, 2026	15	—
Apr 20, 2026	16	—
Apr 19, 2026	18	—
Apr 18, 2026	22	—
Apr 17, 2026	18	—
Apr 16, 2026	19	—
Apr 15, 2026	19	—
Apr 14, 2026	20	—
Apr 13, 2026	20	—
Apr 12, 2026	19	—
Apr 11, 2026	20	—
Apr 10, 2026	20	—
Apr 9, 2026	20	—
Apr 8, 2026	22	—
Apr 7, 2026	25	—

Station Information

USGS Site No: 01395000
State: NJ
County: Union County
Coordinates: 40.6189, -74.2833
Drainage Area: 41 mi²
Datum (ft): 7.6
HUC Code: 020301040104

View on USGS NWIS →

Flood Stage Thresholds

Action Stage: 5.5 ft
Flood Stage: 6.0 ft
Moderate Flood: 8.0 ft
Major Flood: 9.5 ft

Currently 4.52 ft below flood stage.

Recent Extremes

Max discharge: 1,020 cfs

Jul 15, 2025
Min discharge: 8 cfs

Oct 1, 2025
Days at flood stage: 0

Computed from the local daily-values archive.

Nearby Gauges

Passaic River Near Chatham NJ
9.3 mi · 68 cfs

Normal
Canoe Brook Near Summit NJ
9.4 mi · 2 cfs

Normal
Passaic River Near Millington NJ
13.5 mi · 27 cfs

Normal
Whippany River at Morristown NJ
15.9 mi · 26 cfs

Low
Whippany River Near Pine Brook NJ
16.0 mi · 48 cfs

Low