New Hampshire River Levels & Streamflow
As of Aug 6, 2026, New Hampshire rivers are running at 198% of normal across 43 USGS gauges — the highest is 3,900 cfs on the Merrimack R Nr Goffs Falls. Live discharge, gauge height, and percent-of-normal for every USGS streamgauge in New Hampshire.
Streamflow levels across New Hampshire are currently 198% of normal, with the Merrimack R Nr Goffs Falls reporting the highest discharge in the state at 3,900 cfs and a gauge stage of 4.64 ft.
Meanwhile, the Connecticut River Near Dalton is seeing a spike today — up 74% 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.
Active weather warnings for New Hampshire
A Heat Advisory has been issued for eastern Hillsborough and Interior Rockingham Counties in New Hampshire through 8:00 PM EDT on August 6th. Heat index values are expected to reach 97 degrees, creating dangerous conditions from 11 AM through this evening. Residents in affected areas, including communities in these counties, should take precautions to avoid heat-related illnesses by staying hydrated, limiting outdoor activities, and checking on vulnerable individuals. Seek air-conditioned spaces when possible, and never leave children or pets unattended in vehicles.
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 4.64 ft
Biggest 24h spike
Now 969 cfs
Network coverage
USGS gauges feeding 0 named rivers in New Hampshire.
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 |
|---|---|---|---|---|---|---|
|
Merrimack R Nr Goffs Falls, Nh
9 hours ago · USGS 01092000 |
3,330 cfs | 4.39 ft | · | 90°F | 115 ft | Merrimack |
|
Connecticut River At North Walpole, Nh
9 hours ago · USGS 01154500 |
2,480 cfs | 6.61 ft | · | 87°F | 223 ft | Upper Connecticut-Mascoma |
|
Connecticut River At West Lebanon, Nh
9 hours ago · USGS 01144500 |
2,280 cfs | 4.93 ft | · | 89°F | 322 ft | Upper Connecticut-Mascoma |
|
Androscoggin River Near Gorham, Nh
9 hours ago · USGS 01054000 |
1,560 cfs | 3.23 ft | · | 89°F | 848 ft | Upper Androscoggin |
|
Androscoggin River At Errol, Nh
9 hours ago · USGS 01053500 |
1,500 cfs | 2.23 ft | · | 88°F | 1,249 ft | Upper Androscoggin |
|
Contoocook R Bl Hopkinton Dam At W Hopkinton, Nh
9 hours ago · USGS 01085500 |
1,270 cfs | 3.54 ft | · | 88°F | 361 ft | Contoocook |
|
Contoocook River Near Henniker, Nh
9 hours ago · USGS 01085000 |
1,250 cfs | 7.85 ft | · | 87°F | 492 ft | Contoocook |
|
Merrimack River At Franklin Junction, Nh
9 hours ago · USGS 01081500 |
1,000 cfs | 4.40 ft | · | 89°F | 269 ft | Merrimack |
|
Ashuelot River At Hinsdale, Nh
10 hours ago · USGS 01161000 |
848 cfs | 4.85 ft | · | 87°F | 205 ft | Middle Connecticut |
|
Connecticut River Near Dalton, Nh
9 hours ago · USGS 01131500 |
797 cfs | 7.54 ft | · | 88°F | 813 ft | Upper Connecticut |
|
Ashuelot River At West Swanzey, Nh
10 hours ago · USGS 01160350 |
641 cfs | 7.02 ft | · | 86°F | 456 ft | Middle Connecticut |
|
Winnipesaukee River At Tilton, Nh
9 hours ago · USGS 01081000 |
512 cfs | 3.12 ft | · | 88°F | 453 ft | Merrimack |
|
Connecticut River At North Stratford, Nh
9 hours ago · USGS 01129500 |
508 cfs | 3.28 ft | 68°F | 90°F | 885 ft | Upper Connecticut |
|
Souhegan River At Merrimack, Nh
9 hours ago · USGS 01094000 |
350 cfs | 3.48 ft | · | 89°F | 172 ft | Merrimack |
|
Saco River Near Conway, Nh
10 hours ago · USGS 01064500 |
341 cfs | 2.76 ft | · | 63°F | 486 ft | Saco |
|
Connecticut R Below Indian Stream Nr Pittsburg, Nh
9 hours ago · USGS 01129200 |
328 cfs | 2.75 ft | 58°F | 87°F | 1,211 ft | Upper Connecticut |
|
Pemigewasset River At Plymouth, Nh
9 hours ago · USGS 01076500 |
272 cfs | · | · | 89°F | 476 ft | Pemigewasset |
|
Souhegan River (Site Wlr-1) Near Milford, Nh
10 hours ago · USGS 01093852 |
240 cfs | 4.45 ft | 71°F | 88°F | 275 ft | Merrimack |
|
Lamprey River Near Newmarket, Nh
9 hours ago · USGS 01073500 |
218 cfs | 2.22 ft | · | 89°F | 38 ft | Piscataqua-Salmon Falls |
|
Contoocook River At Peterborough, Nh
9 hours ago · USGS 01082000 |
191 cfs | 2.32 ft | · | 85°F | 751 ft | Contoocook |
|
Piscataquog River Near Goffstown, Nh
9 hours ago · USGS 01091500 |
190 cfs | 4.14 ft | · | 88°F | 179 ft | Merrimack |
|
Upper Ammonoosuc River Near Groveton, Nh
9 hours ago · USGS 01130000 |
139 cfs | 2.02 ft | · | 89°F | 963 ft | Upper Connecticut |
|
Pemigewasset River At Woodstock, Nh
9 hours ago · USGS 01075000 |
131 cfs | 2.42 ft | · | 87°F | 620 ft | Pemigewasset |
|
Sugar River At West Claremont, Nh
9 hours ago · USGS 01152500 |
113 cfs | 1.35 ft | · | 88°F | 358 ft | Upper Connecticut-Mascoma |
|
Ashuelot River Below Surry Mt Dam, Nh
9 hours ago · USGS 01158000 |
95 cfs | 5.56 ft | · | 84°F | 502 ft | Middle Connecticut |
|
East Branch Pemigewasset River At Lincoln, Nh
9 hours ago · USGS 01074520 |
81 cfs | 3.72 ft | · | 87°F | 836 ft | Pemigewasset |
|
South Branch Piscataquog River Near Goffstown, Nh
10 hours ago · USGS 01091000 |
80 cfs | 3.67 ft | 71°F | 87°F | 335 ft | Merrimack |
|
Ammonoosuc River At Bethlehem Junction, Nh
9 hours ago · USGS 01137500 |
73 cfs | 1.49 ft | · | 87°F | 1,185 ft | Upper Connecticut |
|
Warner River At Davisville, Nh
9 hours ago · USGS 01086000 |
69 cfs | 3.73 ft | · | 89°F | 393 ft | Contoocook |
|
Exeter River At Haigh Road, Nh
9 hours ago · USGS 01073587 |
66 cfs | 4.83 ft | · | 89°F | 64 ft | Piscataqua-Salmon Falls |
|
Suncook River At North Chichester, Nh
9 hours ago · USGS 01089500 |
64 cfs | 3.12 ft | · | 89°F | 388 ft | Merrimack |
|
Ashuelot River Near Gilsum, Nh
9 hours ago · USGS 01157000 |
64 cfs | 2.46 ft | 70°F | 84°F | 810 ft | Middle Connecticut |
|
Beaver Brook At North Pelham, Nh
9 hours ago · USGS 010965852 |
54 cfs | 6.38 ft | · | 89°F | 156 ft | Merrimack |
|
Spicket River Near Methuen, Nh
9 hours ago · USGS 01100561 |
40 cfs | 3.70 ft | · | 90°F | 109 ft | Merrimack |
|
Baker River Near Rumney, Nh
9 hours ago · USGS 01076000 |
36 cfs | · | · | 88°F | 509 ft | Pemigewasset |
|
Diamond River Near Wentworth Location, Nh
9 hours ago · USGS 01052500 |
31 cfs | 1.78 ft | · | 87°F | 1,315 ft | Upper Androscoggin |
|
Cocheco River Near Rochester, Nh
9 hours ago · USGS 01072800 |
29 cfs | 2.94 ft | · | 90°F | 133 ft | Piscataqua-Salmon Falls |
|
Smith River Near Bristol, Nh
9 hours ago · USGS 01078000 |
24 cfs | 1.75 ft | 58°F | 88°F | 472 ft | Pemigewasset |
|
Bearcamp River At South Tamworth, Nh
9 hours ago · USGS 01064801 |
24 cfs | 3.57 ft | · | 89°F | 553 ft | Saco |
|
Isinglass R At Rochester Neck Rd, Nh
9 hours ago · USGS 01072870 |
19 cfs | 3.12 ft | 73°F | 90°F | 112 ft | Piscataqua-Salmon Falls |
|
Winnicut River At Greenland, Nh
9 hours ago · USGS 01073785 |
10 cfs | 4.33 ft | · | 88°F | 4 ft | Piscataqua-Salmon Falls |
|
Oyster River Near Durham, Nh
9 hours ago · USGS 01073000 |
2 cfs | · | · | 90°F | 69 ft | Piscataqua-Salmon Falls |
|
Spicket River At North Salem, Nh
9 hours ago · USGS 01100505 |
1 cfs | 2.11 ft | · | 90°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 August 6, 2026, New Hampshire rivers are running at 198% of normal across 43 USGS streamgauges, and the Merrimack R Nr Goffs Falls is reporting the highest discharge at 3,900 cfs. The full sortable gauge table is below.
Which New Hampshire river is running highest right now?
As of August 6, 2026, the highest discharge in New Hampshire is 3,900 cfs on the Merrimack R Nr Goffs Falls. 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.