Souhegan River Flow Today
As of October 8, 2026 at 3:30 AM, the Souhegan River is flowing at 65 cfs at Merrimack, NH — 137% of normal for the date and down 2% in 24 hours. 2 of 2 USGS gauges reported in the last 3 days; flows range from 35 to 65 cfs. ❤ Favorite
Souhegan River map
See the Souhegan River on a live map
Every gauge, dam and paddle run on the river, one tap each:
- Gauges now — which reaches are high or low
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Souhegan River conditions today
Where the river is running versus normal, what’s rising or dropping, and what it means for a trip — built from the live USGS readings below.
At Merrimack, the Souhegan River is running 65 cfs — 137% of normal, down 2% since yesterday. Along the river, 2 of 2 reporting gauges are above normal (the typical gauge is at 134% of normal).
How the Souhegan River compares to normal
Every reporting gauge from the top of the river to the bottom: bar length is today’s flow, colour is percent of normal for the date.
Flow along the river, upstream to downstream
- Milford275 ft 35 cfs130%
- Merrimack172 ft 65 cfs137%
Bar length uses a square-root scale so small headwater flows stay visible next to big downstream ones. Colour: <50% 50–90 90–110 110–150 150%+ of normal.
Where every gauge sits
One dot per Souhegan River streamgauge, placed by its own percent of normal. The line is the typical gauge (134%).
Souhegan River flow report
| Streamgage | Streamflow | % of normal | 24h | Gage height | To flood stage | Elevation |
|---|---|---|---|---|---|---|
|
Souhegan River (site Wlr-1) Near Milford NH
Oct 8, 3:45 AM · USGS 01093852 |
35 cfs | 130% | -7% | 3.27 ft | 5.7 ft below | 275 ft |
|
Souhegan River At Merrimack NH
Oct 8, 3:30 AM · USGS 01094000 |
65 cfs | 137% | -2% | 2.51 ft | 6.5 ft below | 172 ft |
USGS provisional data. Readings are in each gauge’s local time; gauges silent for more than 3 days are marked “Last reported”. Tap any gauge for its hydrograph, forecast and history.
Dams & reservoirs on the Souhegan River
Releases from these dams shape the flow downstream. Tap one for its daily level and history.
Souhegan River streamflow over time
Daily total flow across every monitored gauge on the river.
Maximum streamflow by year
Souhegan River
The Souhegan River is a 33-mile-long river in southern New Hampshire that flows from its headwaters in the town of New Ipswich to its confluence with the Merrimack River in the town of Merrimack. The river has a rich history, once powering a variety of mills and factories. Today, the river is used primarily for recreation, including fishing, kayaking, and swimming. The river is also an important source of water for agricultural activities, particularly in the communities of Milford and Wilton. The river is dammed in several locations, including the Pennichuck Brook Dam in Nashua, the Wilton Dam in Wilton, and the Merrimack Village Dam in Merrimack, which impound the water to create reservoirs for drinking water and hydroelectric power generation. Despite its industrial past, the Souhegan River remains an important natural resource for the region.
Fishing near the Souhegan River
About the Souhegan River
How is the Souhegan River flowing right now?
As of October 8, 2026, the Souhegan River is flowing at 65 cfs at Merrimack, NH, about 137% of normal for the date. Across its 2 USGS gauges, current flows range from 35 to 65 cfs. Every gauge’s live reading is in the table above.
Is the Souhegan River running high or low?
The typical gauge on the Souhegan River is at 134% of normal for the date. Above 100% means higher than the historical average for this calendar day; below 100% means lower. The profile above shows which reaches are high or low.
What is flood stage on the Souhegan River?
The National Weather Service sets flood stages for Milford (9.0 ft), Merrimack (9.0 ft). The table shows how far each gauge is below its flood stage right now.
Where does the data come from?
Discharge and gage height are from the USGS National Water Information System; flood stages from the National Weather Service. The history chart sums every monitored gauge on the river.
Can I get alerts for a gauge?
Yes — open any gauge from the table, favorite it in the Snoflo app and set a flow threshold.