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 — 56th percentile for this date) . Gage height: 1.48 ft.
Reading from
Historical Percentile Comparison
Today's discharge compared to the long-term record for October 28 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 | 3 | |
| 25th | Low threshold | 6 | |
| 50th (Median) | Normal (median) | 13 | |
| 75th | High threshold | 30 | Today: 17 cfs |
| 95th | Very High threshold | 352 |
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.
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
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 cfsJul 15, 2025
- Min discharge
-
8 cfsOct 1, 2025
- Days at flood stage
- 0
Computed from the local daily-values archive.
Nearby Gauges
-
Passaic River Near Chatham NJNormal9.3 mi · 68 cfs
-
Canoe Brook Near Summit NJNormal9.4 mi · 2 cfs
-
Passaic River Near Millington NJNormal13.5 mi · 27 cfs
-
Whippany River at Morristown NJNormal15.9 mi · 26 cfs
-
Whippany River Near Pine Brook NJNormal16.0 mi · 48 cfs