Ammonoosuc River at Bethlehem Junction, NH
USGS Site No: 01137500 • Ammonoosuc River • Grafton County, NH
Ammonoosuc River at Bethlehem Junction, NH on the Ammonoosuc River is currently at 141 cfs (Normal — 40th percentile for this date) . Gage height: 1.94 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 | 92 | |
| 25th | Low threshold | 114 | |
| 50th (Median) | Normal (median) | 159 | Today: 141 cfs |
| 75th | High threshold | 275 | |
| 95th | Very High threshold | 557 |
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 | 149 | — |
| May 27, 2026 | 176 | — |
| May 26, 2026 | 240 | — |
| May 25, 2026 | 254 | — |
| May 24, 2026 | 168 | — |
| May 23, 2026 | 181 | — |
| May 22, 2026 | 203 | — |
| May 21, 2026 | 234 | — |
| May 20, 2026 | 268 | — |
| May 19, 2026 | 302 | — |
| May 18, 2026 | 351 | — |
| May 17, 2026 | 441 | — |
| May 16, 2026 | 638 | — |
| May 15, 2026 | 1,450 | — |
| Apr 21, 2026 | 485 | — |
| Apr 20, 2026 | 723 | — |
| Apr 19, 2026 | 877 | — |
| Apr 18, 2026 | 746 | — |
| Apr 17, 2026 | 1,750 | — |
| Apr 16, 2026 | 834 | — |
| Apr 15, 2026 | 1,140 | — |
| Apr 14, 2026 | 828 | — |
| Apr 13, 2026 | 457 | — |
| Apr 12, 2026 | 349 | — |
| Apr 11, 2026 | 502 | — |
| Apr 10, 2026 | 290 | — |
| Apr 9, 2026 | 270 | — |
| Apr 8, 2026 | 295 | — |
| Apr 7, 2026 | 377 | — |
| Apr 6, 2026 | 586 | — |
Station Information
- USGS Site No
- 01137500
- State
- NH
- County
- Grafton County
- Coordinates
- 44.2687, -71.6304
- Drainage Area
- 88 mi²
- Datum (ft)
- 1,180.5
- HUC Code
- 01080101
Recent Extremes
- Max discharge
-
2,130 cfsMar 17, 2026
- Min discharge
-
22 cfsSep 22, 2025
Computed from the local daily-values archive.
Nearby Gauges
-
Connecticut River Near Dalton, NHNormal10.7 mi · 2,250 cfs
-
Ammonoosuc River Below Lisbon Dam, at Lisbon, NHVery High14.6 mi · 155 cfs
-
East Branch Pemigewasset River at Lincoln, NHNormal15.3 mi · 239 cfs
-
Kirby Brook at Concord, VTUnknown17.1 mi
-
Moose River at Victory, VTNormal19.7 mi · 103 cfs