Cockermouth River Below Hardy Brook, at Groton, NH
USGS Site No: 01077400 • Cockermouth River • Grafton County, NH
Cockermouth River Below Hardy Brook, at Groton, NH on the Cockermouth River is currently at 46 cfs (Very High — 95th percentile for this date) . Gage height: 1.82 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 | 4 | |
| 25th | Low threshold | 7 | |
| 50th (Median) | Normal (median) | 14 | |
| 75th | High threshold | 34 | |
| 95th | Very High threshold | 0 |
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 | 51 | — |
| May 27, 2026 | 61 | — |
| May 26, 2026 | 89 | — |
| May 25, 2026 | 149 | — |
| May 24, 2026 | 58 | — |
| May 23, 2026 | 44 | — |
| May 22, 2026 | 47 | — |
| May 21, 2026 | 51 | — |
| May 20, 2026 | 57 | — |
| May 19, 2026 | 66 | — |
| May 18, 2026 | 77 | — |
| May 17, 2026 | 99 | — |
| May 16, 2026 | 155 | — |
| May 15, 2026 | 492 | — |
| Apr 21, 2026 | 105 | — |
| Apr 20, 2026 | 152 | — |
| Apr 19, 2026 | 178 | — |
| Apr 18, 2026 | 116 | — |
| Apr 17, 2026 | 224 | — |
| Apr 16, 2026 | 66 | — |
| Apr 15, 2026 | 78 | — |
| Apr 14, 2026 | 60 | — |
| Apr 13, 2026 | 51 | — |
| Apr 12, 2026 | 44 | — |
| Apr 11, 2026 | 54 | — |
| Apr 10, 2026 | 50 | — |
| Apr 9, 2026 | 53 | — |
| Apr 8, 2026 | 56 | — |
| Apr 7, 2026 | 67 | — |
| Apr 6, 2026 | 101 | — |
Station Information
- USGS Site No
- 01077400
- State
- NH
- County
- Grafton County
- Coordinates
- 43.7039, -71.8333
- Drainage Area
- 21 mi²
- Datum (ft)
- 608.4
- HUC Code
- 01070001
Flood Stage Thresholds
- Action Stage
- 8.5 ft
- Flood Stage
- 9.5 ft
- Moderate Flood
- 10.0 ft
- Major Flood
- 12.0 ft
Currently 7.68 ft below flood stage.
Recent Extremes
- Max discharge
-
580 cfsMay 10, 2025
- Min discharge
-
0 cfsSep 14, 2025
- Days at flood stage
- 0
Computed from the local daily-values archive.
Nearby Gauges
-
Baker River Near Rumney, NHNormal6.4 mi · 177 cfs
-
Pemigewasset River at Plymouth, NHNormal8.3 mi · 914 cfs
-
Smith River Near Bristol, NHNormal10.4 mi · 108 cfs
-
Pemigewasset River at Woodstock, NHNormal20.3 mi · 364 cfs
-
Merrimack River at Franklin Junction, NHHigh21.4 mi · 3,570 cfs