New Hampshire River Levels & Streamflow
As of Sep 20, 2026, New Hampshire rivers are running at 106% of normal across 43 USGS gauges — the highest is 2,650 cfs on the Connecticut River At North Walpole. Live discharge, gauge height, and percent-of-normal for every USGS streamgauge in New Hampshire.
Streamflow levels across New Hampshire are currently 106% of normal, with the Connecticut River At North Walpole reporting the highest discharge in the state at 2,650 cfs and a gauge stage of 6.72 ft.
Meanwhile, the Merrimack River At Franklin Junction is seeing a spike today — up 54% since yesterday and currently running near peak.
Tap any gauge below for the full hydrograph, paired weather forecast, and historical context. Use the rivers panel to jump into New Hampshire's named rivers.
State-wide streamflow overview
The New Hampshire flow picture in four data points -- where the state sits versus historical norms, what's flowing hardest, and what's spiking fastest.
Percent of normal
100% is the historical norm. Below 70% indicates drought; above 130% can flag elevated flood risk.
Highest discharge
Gauge stage 6.72 ft
Biggest 24h spike
Now 966 cfs
Network coverage
USGS gauges feeding 0 named rivers in New Hampshire.
Where every gauge actually sits
One dot per New Hampshire streamgauge, placed by its own percent of normal. The state average is a single line through all of it.
Percent of normal compares today's discharge with the historical average for this calendar day. Tap any dot to open that gauge.
New Hampshire streamflow, three water years
Statewide percent of normal, every day since Sep 2023. The dotted line is normal.
799 daily readings from 43 reporting gauges. Percent of normal is today's statewide discharge against the historical average for the same calendar day — 100% is normal, not "good". The axis tops out at 250%: 22 readings above that — including the 582% peak in Dec 2023 — are drawn along the top edge, so a few flood days cannot flatten three years of everything else. The line breaks in 2 places where the record skips more than five days — those are gaps in reporting, not readings of zero.
New Hampshire USGS streamgauges
Every USGS gauge Snoflo tracks in New Hampshire. Sortable, quickly filterable. Numeric columns heat-mapped from light to deep. Tap any gauge for its full hydrograph and forecast.
| Streamgage | Streamflow | Gage height | Water temp | Air temp | Elevation | Watershed |
|---|---|---|---|---|---|---|
|
Connecticut River At North Walpole, Nh
1 day ago · USGS 01154500 |
2,100 cfs | 6.36 ft | · | 66°F | 223 ft | Upper Connecticut-Mascoma |
|
Connecticut River At West Lebanon, Nh
1 day ago · USGS 01144500 |
1,730 cfs | 4.59 ft | · | 66°F | 322 ft | Upper Connecticut-Mascoma |
|
Merrimack R Nr Goffs Falls, Nh
1 day ago · USGS 01092000 |
1,490 cfs | 3.33 ft | · | 67°F | 115 ft | Merrimack |
|
Androscoggin River Near Gorham, Nh
1 day ago · USGS 01054000 |
1,090 cfs | 2.75 ft | · | 63°F | 848 ft | Upper Androscoggin |
|
Androscoggin River At Errol, Nh
1 day ago · USGS 01053500 |
1,000 cfs | 1.73 ft | · | 61°F | 1,249 ft | Upper Androscoggin |
|
Connecticut River Near Dalton, Nh
1 day ago · USGS 01131500 |
592 cfs | 7.22 ft | · | 62°F | 813 ft | Upper Connecticut |
|
Merrimack River At Franklin Junction, Nh
1 day ago · USGS 01081500 |
562 cfs | 3.74 ft | · | 66°F | 269 ft | Merrimack |
|
Connecticut River At North Stratford, Nh
1 day ago · USGS 01129500 |
432 cfs | 3.16 ft | 59°F | 63°F | 885 ft | Upper Connecticut |
|
Connecticut R Below Indian Stream Nr Pittsburg, Nh
1 day ago · USGS 01129200 |
315 cfs | 2.72 ft | 61°F | 60°F | 1,211 ft | Upper Connecticut |
|
Winnipesaukee River At Tilton, Nh
1 day ago · USGS 01081000 |
314 cfs | 2.61 ft | · | 66°F | 453 ft | Merrimack |
|
Pemigewasset River At Plymouth, Nh
1 day ago · USGS 01076500 |
239 cfs | · | · | 65°F | 476 ft | Pemigewasset |
|
Contoocook R Bl Hopkinton Dam At W Hopkinton, Nh
1 day ago · USGS 01085500 |
230 cfs | 1.92 ft | · | 66°F | 361 ft | Contoocook |
|
Sugar River At West Claremont, Nh
1 day ago · USGS 01152500 |
190 cfs | 1.62 ft | · | 66°F | 358 ft | Upper Connecticut-Mascoma |
|
Contoocook River Near Henniker, Nh
1 day ago · USGS 01085000 |
159 cfs | 5.43 ft | · | 65°F | 492 ft | Contoocook |
|
Ashuelot River At Hinsdale, Nh
1 day ago · USGS 01161000 |
159 cfs | 3.26 ft | · | 68°F | 205 ft | Middle Connecticut |
|
Saco River Near Conway, Nh
1 day ago · USGS 01064500 |
148 cfs | 2.21 ft | · | 66°F | 486 ft | Saco |
|
Ashuelot River At West Swanzey, Nh
1 day ago · USGS 01160350 |
110 cfs | 5.41 ft | · | 67°F | 456 ft | Middle Connecticut |
|
Pemigewasset River At Woodstock, Nh
1 day ago · USGS 01075000 |
85 cfs | 2.22 ft | · | 62°F | 620 ft | Pemigewasset |
|
Warner River At Davisville, Nh
1 day ago · USGS 01086000 |
71 cfs | 3.75 ft | · | 66°F | 393 ft | Contoocook |
|
Upper Ammonoosuc River Near Groveton, Nh
1 day ago · USGS 01130000 |
62 cfs | 1.80 ft | · | 62°F | 963 ft | Upper Connecticut |
|
Smith River Near Bristol, Nh
1 day ago · USGS 01078000 |
61 cfs | 2.38 ft | 58°F | 65°F | 472 ft | Pemigewasset |
|
East Branch Pemigewasset River At Lincoln, Nh
1 day ago · USGS 01074520 |
55 cfs | 3.55 ft | · | 64°F | 836 ft | Pemigewasset |
|
Souhegan River At Merrimack, Nh
1 day ago · USGS 01094000 |
49 cfs | 2.40 ft | · | 67°F | 172 ft | Merrimack |
|
Ammonoosuc River At Bethlehem Junction, Nh
1 day ago · USGS 01137500 |
46 cfs | 1.22 ft | · | 62°F | 1,185 ft | Upper Connecticut |
|
Baker River Near Rumney, Nh
1 day ago · USGS 01076000 |
45 cfs | · | · | 62°F | 509 ft | Pemigewasset |
|
Ashuelot River Near Gilsum, Nh
1 day ago · USGS 01157000 |
38 cfs | 2.12 ft | 61°F | 65°F | 810 ft | Middle Connecticut |
|
Ashuelot River Below Surry Mt Dam, Nh
1 day ago · USGS 01158000 |
33 cfs | 4.97 ft | · | 63°F | 502 ft | Middle Connecticut |
|
Isinglass R At Rochester Neck Rd, Nh
1 day ago · USGS 01072870 |
30 cfs | 3.34 ft | 63°F | 65°F | 112 ft | Piscataqua-Salmon Falls |
|
Cocheco River Near Rochester, Nh
1 day ago · USGS 01072800 |
28 cfs | 2.91 ft | · | 66°F | 133 ft | Piscataqua-Salmon Falls |
|
Contoocook River At Peterborough, Nh
1 day ago · USGS 01082000 |
25 cfs | 1.30 ft | · | 65°F | 751 ft | Contoocook |
|
South Branch Piscataquog River Near Goffstown, Nh
1 day ago · USGS 01091000 |
21 cfs | 3.19 ft | 62°F | 65°F | 335 ft | Merrimack |
|
Diamond River Near Wentworth Location, Nh
1 day ago · USGS 01052500 |
21 cfs | 1.63 ft | · | 61°F | 1,315 ft | Upper Androscoggin |
|
Souhegan River (Site Wlr-1) Near Milford, Nh
1 day ago · USGS 01093852 |
20 cfs | 3.05 ft | 63°F | 67°F | 275 ft | Merrimack |
|
Piscataquog River Near Goffstown, Nh
1 day ago · USGS 01091500 |
19 cfs | 3.09 ft | · | 66°F | 179 ft | Merrimack |
|
Lamprey River Near Newmarket, Nh
1 day ago · USGS 01073500 |
17 cfs | · | · | 65°F | 38 ft | Piscataqua-Salmon Falls |
|
Bearcamp River At South Tamworth, Nh
1 day ago · USGS 01064801 |
12 cfs | 3.29 ft | · | 66°F | 553 ft | Saco |
|
Suncook River At North Chichester, Nh
1 day ago · USGS 01089500 |
11 cfs | 2.57 ft | · | 66°F | 388 ft | Merrimack |
|
Spicket River Near Methuen, Nh
1 day ago · USGS 01100561 |
10 cfs | 3.54 ft | · | 67°F | 109 ft | Merrimack |
|
Beaver Brook At North Pelham, Nh
1 day ago · USGS 010965852 |
6 cfs | 5.65 ft | · | 66°F | 156 ft | Merrimack |
|
Exeter River At Haigh Road, Nh
1 day ago · USGS 01073587 |
4 cfs | 3.93 ft | · | 66°F | 64 ft | Piscataqua-Salmon Falls |
|
Oyster River Near Durham, Nh
1 day ago · USGS 01073000 |
2 cfs | · | · | 65°F | 69 ft | Piscataqua-Salmon Falls |
|
Winnicut River At Greenland, Nh
1 day ago · USGS 01073785 |
1 cfs | 4.37 ft | · | 64°F | 4 ft | Piscataqua-Salmon Falls |
|
Spicket River At North Salem, Nh
1 day ago · USGS 01100505 |
0 cfs | 1.92 ft | · | 66°F | 194 ft | Merrimack |
See every New Hampshire gauge ranked against normal.
- Percentile rank & % of median for all 43 gauges
- 15-day PULSE forecast on every gauge
- Custom flow alerts & full daily history
About New Hampshire streamflow
What are river levels like in New Hampshire right now?
As of September 20, 2026, New Hampshire rivers are running at 106% of normal across 43 USGS streamgauges, and the Connecticut River At North Walpole is reporting the highest discharge at 2,650 cfs. The full sortable gauge table is below.
Which New Hampshire river is running highest right now?
As of September 20, 2026, the highest discharge in New Hampshire is 2,650 cfs on the Connecticut River At North Walpole. See the sortable gauge table for the full statewide ranking.
Are New Hampshire rivers high or low right now?
Compare the statewide percent-of-normal on this page: above 100% means New Hampshire rivers are running higher than the seasonal average for the date, below 100% means lower (a dry spell or drought). Each gauge also shows its own percent of median.
Where does the New Hampshire streamflow data come from?
The U.S. Geological Survey National Water Information System. USGS streamgauges report continuously (every 15 minutes) and the data is the canonical real-time record for U.S. rivers. Snoflo pulls the latest readings and joins them to a 7-day NOAA weather forecast for each station.
What is cfs?
Cubic feet per second — the standard unit for streamflow. One cfs is about 7.5 gallons per second. Small creeks run at single-digit cfs; the Mississippi at hundreds of thousands.
What does Gauge Height mean?
The water level at the gauge in feet above the reference datum. Used together with discharge to track river state. Flood stage and runnable levels are typically expressed in gauge height (e.g., "flood at 16 ft").
How fresh is the New Hampshire data?
USGS streamgauges report every 15 minutes; Snoflo re-pulls throughout the day. The AI briefing regenerates daily.
Can I get a flow alert for a New Hampshire gauge?
Yes. Save any USGS gauge as a favorite in the Snoflo iOS app, set a discharge or stage threshold (e.g. "alert me when discharge crosses 2,000 cfs"), and you'll get a push the moment it crosses.
Is this a substitute for an NWS flood warning?
No. Snoflo is informational. For flood life-safety decisions always follow guidance from your local NWS forecast office and state emergency management. Snoflo data is one input among several.
Streamflow in every state
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