Upper Ammonoosuc River Near Groveton, NH
USGS Site No: 01130000 • Upper Ammonoosuc River • Coos County, NH
Upper Ammonoosuc River Near Groveton, NH on the Upper Ammonoosuc River is currently at 292 cfs (Normal — 54th percentile for this date) . Gage height: 2.50 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 | 110 | |
| 25th | Low threshold | 160 | |
| 50th (Median) | Normal (median) | 264 | |
| 75th | High threshold | 433 | Today: 292 cfs |
| 95th | Very High threshold | 1,160 |
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 | 326 | — |
| May 27, 2026 | 435 | — |
| May 26, 2026 | 656 | — |
| May 25, 2026 | 558 | — |
| May 24, 2026 | 309 | — |
| May 23, 2026 | 321 | — |
| May 22, 2026 | 366 | — |
| May 21, 2026 | 429 | — |
| May 20, 2026 | 507 | — |
| May 19, 2026 | 597 | — |
| May 18, 2026 | 695 | — |
| May 17, 2026 | 919 | — |
| May 16, 2026 | 1,500 | — |
| May 15, 2026 | 1,730 | — |
| Apr 21, 2026 | 1,370 | — |
| Apr 20, 2026 | 1,830 | — |
| Apr 19, 2026 | 1,950 | — |
| Apr 18, 2026 | 2,680 | — |
| Apr 17, 2026 | 3,440 | — |
| Apr 16, 2026 | 2,390 | — |
| Apr 15, 2026 | 2,530 | — |
| Apr 14, 2026 | 2,080 | — |
| Apr 13, 2026 | 1,350 | — |
| Apr 12, 2026 | 1,230 | — |
| Apr 11, 2026 | 1,420 | — |
| Apr 10, 2026 | 936 | — |
| Apr 9, 2026 | 914 | — |
| Apr 8, 2026 | 1,050 | — |
| Apr 7, 2026 | 1,440 | — |
| Apr 6, 2026 | 2,050 | — |
Station Information
- USGS Site No
- 01130000
- State
- NH
- County
- Coos County
- Coordinates
- 44.6251, -71.4690
- Drainage Area
- 232 mi²
- Datum (ft)
- 916.4
- HUC Code
- 01080101
Flood Stage Thresholds
- Action Stage
- 6.5 ft
- Flood Stage
- 7.5 ft
- Moderate Flood
- 9.0 ft
- Major Flood
- 10.0 ft
Currently 5.00 ft below flood stage.
Recent Extremes
- Max discharge
-
3,440 cfsApr 17, 2026
- Min discharge
-
32 cfsSep 21, 2025
- Days at flood stage
- 0
Computed from the local daily-values archive.
Nearby Gauges
-
Connecticut River at North Stratford, NHNormal11.7 mi · 1,250 cfs
-
Androscoggin River Below Bog Brook at Cambridge NHNormal14.4 mi · 2,220 cfs
-
Androscoggin River Near Gorham, NHHigh19.0 mi · 2,390 cfs
-
Connecticut River Near Dalton, NHNormal19.4 mi · 2,250 cfs
-
Moose River at Victory, VTNormal19.8 mi · 103 cfs