Stony Brook at Watchung NJ
USGS Site No: 01403540 • Stony Brook • Somerset County, NJ
Stony Brook at Watchung NJ on the Stony Brook is currently at 4 cfs (Normal — 52th percentile for this date) . Gage height: 9.61 ft.
Reading from
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 | 2 | |
| 25th | Low threshold | 2 | |
| 50th (Median) | Normal (median) | 4 | |
| 75th | High threshold | 6 | Today: 4 cfs |
| 95th | Very High threshold | 24 |
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 | 4 | — |
| May 28, 2026 | 4 | — |
| May 27, 2026 | 5 | — |
| May 26, 2026 | 7 | — |
| May 25, 2026 | 11 | — |
| May 24, 2026 | 32 | — |
| May 23, 2026 | 3 | — |
| May 22, 2026 | 3 | — |
| May 21, 2026 | 5 | — |
| May 20, 2026 | 4 | — |
| May 19, 2026 | 3 | — |
| May 18, 2026 | 3 | — |
| May 17, 2026 | 3 | — |
| May 16, 2026 | 3 | — |
| May 15, 2026 | 3 | — |
| Apr 21, 2026 | 3 | — |
| Apr 20, 2026 | 4 | — |
| Apr 19, 2026 | 4 | — |
| Apr 18, 2026 | 4 | — |
| Apr 17, 2026 | 4 | — |
| Apr 16, 2026 | 4 | — |
| Apr 15, 2026 | 4 | — |
| Apr 14, 2026 | 5 | — |
| Apr 13, 2026 | 5 | — |
| Apr 12, 2026 | 5 | — |
| Apr 11, 2026 | 5 | — |
| Apr 10, 2026 | 5 | — |
| Apr 9, 2026 | 5 | — |
| Apr 8, 2026 | 5 | — |
| Apr 7, 2026 | 6 | — |
Station Information
- USGS Site No
- 01403540
- State
- NJ
- County
- Somerset County
- Coordinates
- 40.6364, -74.4514
- Drainage Area
- 6 mi²
- Datum (ft)
- 161.0
- HUC Code
- 020301050504
Flood Stage Thresholds
- Action Stage
- 14.0 ft
- Flood Stage
- 14.0 ft
Currently 4.39 ft below flood stage.
Recent Extremes
- Max discharge
-
656 cfsJul 14, 2025
- Min discharge
-
1 cfsNov 5, 2025
- Days at flood stage
- 0
Computed from the local daily-values archive.
Nearby Gauges
-
Passaic River Near Millington NJNormal5.1 mi · 27 cfs
-
Passaic River Near Chatham NJNormal7.0 mi · 68 cfs
-
Rahway River Near Springfield NJNormal8.1 mi · 12 cfs
-
Robinsons Branch at Rahway NJNormal8.2 mi · 7 cfs
-
Rahway River at Rahway NJNormal8.9 mi · 17 cfs