Contoocook River below Hopkinton Dam at West Hopkinton, NH
USGS Site No: 01085500 • Contoocook River • Merrimack County, NH
Contoocook River below Hopkinton Dam at West Hopkinton, NH on the Contoocook River is currently at 478 cfs (Normal — 56th percentile for this date) . Gage height: 2.37 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 | 172 | |
| 50th (Median) | Normal (median) | 346 | |
| 75th | High threshold | 856 | Today: 478 cfs |
| 95th | Very High threshold | 2,170 |
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 | 579 | — |
| May 27, 2026 | 724 | — |
| May 26, 2026 | 716 | — |
| May 25, 2026 | 480 | — |
| May 24, 2026 | 429 | — |
| May 23, 2026 | 485 | — |
| May 22, 2026 | 571 | — |
| May 21, 2026 | 616 | — |
| May 20, 2026 | 1,010 | — |
| May 19, 2026 | 1,400 | — |
| May 18, 2026 | 1,860 | — |
| May 17, 2026 | 2,630 | — |
| May 16, 2026 | 3,030 | — |
| May 15, 2026 | 2,400 | — |
| Apr 21, 2026 | 706 | — |
| Apr 20, 2026 | 740 | — |
| Apr 19, 2026 | 746 | — |
| Apr 18, 2026 | 784 | — |
| Apr 17, 2026 | 736 | — |
| Apr 16, 2026 | 724 | — |
| Apr 15, 2026 | 669 | — |
| Apr 14, 2026 | 630 | — |
| Apr 13, 2026 | 657 | — |
| Apr 12, 2026 | 699 | — |
| Apr 11, 2026 | 887 | — |
| Apr 10, 2026 | 1,010 | — |
| Apr 9, 2026 | 1,180 | — |
| Apr 8, 2026 | 1,290 | — |
| Apr 7, 2026 | 1,440 | — |
| Apr 6, 2026 | 1,640 | — |
Station Information
- USGS Site No
- 01085500
- State
- NH
- County
- Merrimack County
- Coordinates
- 43.1929, -71.7473
- Drainage Area
- 427 mi²
- Datum (ft)
- 355.2
- HUC Code
- 01070003
Recent Extremes
- Max discharge
-
4,630 cfsMay 8, 2025
- Min discharge
-
46 cfsSep 21, 2025
Computed from the local daily-values archive.
Nearby Gauges
-
Warner River at Davisville, NHNormal4.1 mi · 162 cfs
-
Contoocook River Near Henniker, NHNormal6.2 mi · 426 cfs
-
Blackwater River Near Webster, NHHigh7.7 mi · 248 cfs
-
Piscataquog River below Everett Dam, near East Weare, NHHigh8.3 mi · 92 cfs
-
South Branch Piscataquog River Near Goffstown, NHNormal13.4 mi · 79 cfs