Raritan River at Manville NJ
USGS Site No: 01400500 • Raritan River • Somerset County, NJ
Raritan River at Manville NJ on the Raritan River is currently at 213 cfs (Low — 21th percentile for this date) . Gage height: 4.07 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 | 156 | |
| 25th | Low threshold | 234 | Today: 213 cfs |
| 50th (Median) | Normal (median) | 356 | |
| 75th | High threshold | 595 | |
| 95th | Very High threshold | 1,230 |
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 28, 2026 | 258 | — |
| May 27, 2026 | 307 | — |
| May 26, 2026 | 438 | — |
| May 25, 2026 | 766 | — |
| May 24, 2026 | 839 | — |
| May 23, 2026 | 195 | — |
| May 22, 2026 | 220 | — |
| May 21, 2026 | 270 | — |
| May 20, 2026 | 221 | — |
| May 19, 2026 | 212 | — |
| May 18, 2026 | 190 | — |
| May 17, 2026 | 183 | — |
| May 16, 2026 | 192 | — |
| May 15, 2026 | 209 | — |
| Apr 21, 2026 | 221 | — |
| Apr 20, 2026 | 219 | — |
| Apr 19, 2026 | 223 | — |
| Apr 18, 2026 | 242 | — |
| Apr 17, 2026 | 255 | — |
| Apr 16, 2026 | 280 | — |
| Apr 15, 2026 | 258 | — |
| Apr 14, 2026 | 275 | — |
| Apr 13, 2026 | 285 | — |
| Apr 12, 2026 | 298 | — |
| Apr 11, 2026 | 315 | — |
| Apr 10, 2026 | 310 | — |
| Apr 9, 2026 | 316 | — |
| Apr 8, 2026 | 327 | — |
| Apr 7, 2026 | 365 | — |
| Apr 6, 2026 | 513 | — |
Station Information
- USGS Site No
- 01400500
- State
- NJ
- County
- Somerset County
- Coordinates
- 40.5556, -74.5828
- Drainage Area
- 490 mi²
- Datum (ft)
- 20.6
- HUC Code
- 02030105
Flood Stage Thresholds
- Action Stage
- 12.0 ft
- Flood Stage
- 14.0 ft
- Moderate Flood
- 17.0 ft
- Major Flood
- 20.0 ft
Currently 9.93 ft below flood stage.
Recent Extremes
- Max discharge
-
6,860 cfsMar 6, 2026
- Min discharge
-
166 cfsDec 13, 2025
- Days at flood stage
- 0
Computed from the local daily-values archive.
Nearby Gauges
-
Passaic River Near Millington NJNormal9.1 mi · 27 cfs
-
Robinsons Branch at Rahway NJNormal15.3 mi · 7 cfs
-
Passaic River Near Chatham NJNormal15.5 mi · 68 cfs
-
Robinsons Branch at Maple Ave at Rahway NJLow15.6 mi · 1 cfs
-
Rahway River at Rahway NJNormal16.3 mi · 17 cfs