New Hampshire streamflow
Live discharge, gauge height, water temperature, and percent-of-normal readings from every USGS streamgauge in New Hampshire. Built for paddlers, anglers, water managers, and flood researchers.
Streamflow levels across New Hampshire are currently 99% of normal, with the Connecticut River At North Walpole reporting the highest discharge in the state at 3,420 cfs and a gauge stage of 7.18 ft.
Meanwhile, the Androscoggin River At Errol is seeing a spike today — up 19% 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 7.18 ft
Biggest 24h spike
Now 1,780 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 |
|---|---|---|---|---|---|---|
|
Connecticut River At North Walpole, Nh
18 hours ago · USGS 01154500 |
2,700 cfs | 6.75 ft | · | 95°F | 223 ft | Upper Connecticut-Mascoma |
|
Connecticut River At West Lebanon, Nh
18 hours ago · USGS 01144500 |
2,140 cfs | 4.84 ft | · | 97°F | 322 ft | Upper Connecticut-Mascoma |
|
Androscoggin River Near Gorham, Nh
18 hours ago · USGS 01054000 |
1,880 cfs | 3.51 ft | · | 93°F | 848 ft | Upper Androscoggin |
|
Androscoggin River At Errol, Nh
17 hours ago · USGS 01053500 |
1,780 cfs | 2.47 ft | · | 91°F | 1,249 ft | Upper Androscoggin |
|
Merrimack R Nr Goffs Falls, Nh
18 hours ago · USGS 01092000 |
1,780 cfs | 3.54 ft | · | 98°F | 115 ft | Merrimack |
|
Merrimack River At Franklin Junction, Nh
18 hours ago · USGS 01081500 |
1,090 cfs | 4.51 ft | · | 96°F | 269 ft | Merrimack |
|
Connecticut River Near Dalton, Nh
18 hours ago · USGS 01131500 |
992 cfs | 7.81 ft | · | 94°F | 813 ft | Upper Connecticut |
|
Winnipesaukee River At Tilton, Nh
18 hours ago · USGS 01081000 |
638 cfs | 3.39 ft | · | 95°F | 453 ft | Merrimack |
|
Connecticut River At North Stratford, Nh
18 hours ago · USGS 01129500 |
625 cfs | 3.45 ft | 66°F | 93°F | 885 ft | Upper Connecticut |
|
Connecticut R Below Indian Stream Nr Pittsburg, Nh
18 hours ago · USGS 01129200 |
324 cfs | 2.74 ft | 55°F | 88°F | 1,211 ft | Upper Connecticut |
|
Saco River Near Conway, Nh
17 hours ago · USGS 01064500 |
306 cfs | 2.68 ft | · | 96°F | 486 ft | Saco |
|
Pemigewasset River At Plymouth, Nh
18 hours ago · USGS 01076500 |
287 cfs | · | · | 95°F | 476 ft | Pemigewasset |
|
Upper Ammonoosuc River Near Groveton, Nh
18 hours ago · USGS 01130000 |
190 cfs | 2.17 ft | · | 93°F | 963 ft | Upper Connecticut |
|
Pemigewasset River At Woodstock, Nh
18 hours ago · USGS 01075000 |
136 cfs | 2.44 ft | · | 93°F | 620 ft | Pemigewasset |
|
Ashuelot River At Hinsdale, Nh
17 hours ago · USGS 01161000 |
125 cfs | 3.32 ft | · | 95°F | 205 ft | Middle Connecticut |
|
Sugar River At West Claremont, Nh
18 hours ago · USGS 01152500 |
104 cfs | 1.31 ft | · | 96°F | 358 ft | Upper Connecticut-Mascoma |
|
Contoocook River Near Henniker, Nh
18 hours ago · USGS 01085000 |
103 cfs | 4.80 ft | · | 95°F | 492 ft | Contoocook |
|
Ashuelot River At West Swanzey, Nh
17 hours ago · USGS 01160350 |
95 cfs | 5.31 ft | · | 95°F | 456 ft | Middle Connecticut |
|
Contoocook R Bl Hopkinton Dam At W Hopkinton, Nh
18 hours ago · USGS 01085500 |
92 cfs | 1.46 ft | · | 96°F | 361 ft | Contoocook |
|
East Branch Pemigewasset River At Lincoln, Nh
18 hours ago · USGS 01074520 |
90 cfs | 3.77 ft | · | 93°F | 836 ft | Pemigewasset |
|
Ammonoosuc River At Bethlehem Junction, Nh
18 hours ago · USGS 01137500 |
67 cfs | 1.44 ft | · | 93°F | 1,185 ft | Upper Connecticut |
|
Baker River Near Rumney, Nh
17 hours ago · USGS 01076000 |
51 cfs | · | · | 93°F | 509 ft | Pemigewasset |
|
Diamond River Near Wentworth Location, Nh
18 hours ago · USGS 01052500 |
48 cfs | 1.95 ft | · | 90°F | 1,315 ft | Upper Androscoggin |
|
Piscataquog River Near Goffstown, Nh
18 hours ago · USGS 01091500 |
44 cfs | 3.33 ft | · | 98°F | 179 ft | Merrimack |
|
Souhegan River At Merrimack, Nh
18 hours ago · USGS 01094000 |
43 cfs | 2.31 ft | · | 98°F | 172 ft | Merrimack |
|
Suncook River At North Chichester, Nh
18 hours ago · USGS 01089500 |
34 cfs | 2.89 ft | · | 96°F | 388 ft | Merrimack |
|
Lamprey River Near Newmarket, Nh
18 hours ago · USGS 01073500 |
33 cfs | 1.06 ft | · | 98°F | 38 ft | Piscataqua-Salmon Falls |
|
Warner River At Davisville, Nh
18 hours ago · USGS 01086000 |
28 cfs | 3.31 ft | · | 96°F | 393 ft | Contoocook |
|
Smith River Near Bristol, Nh
18 hours ago · USGS 01078000 |
25 cfs | 1.76 ft | 58°F | 95°F | 472 ft | Pemigewasset |
|
South Branch Piscataquog River Near Goffstown, Nh
17 hours ago · USGS 01091000 |
24 cfs | 3.19 ft | 73°F | 97°F | 335 ft | Merrimack |
|
Bearcamp River At South Tamworth, Nh
18 hours ago · USGS 01064801 |
20 cfs | 3.50 ft | · | 95°F | 553 ft | Saco |
|
Souhegan River (Site Wlr-1) Near Milford, Nh
17 hours ago · USGS 01093852 |
19 cfs | 3.07 ft | 72°F | 97°F | 275 ft | Merrimack |
|
Cocheco River Near Rochester, Nh
18 hours ago · USGS 01072800 |
19 cfs | 2.77 ft | · | 98°F | 133 ft | Piscataqua-Salmon Falls |
|
Ashuelot River Below Surry Mt Dam, Nh
18 hours ago · USGS 01158000 |
17 cfs | 4.76 ft | · | 93°F | 502 ft | Middle Connecticut |
|
Exeter River At Haigh Road, Nh
18 hours ago · USGS 01073587 |
16 cfs | 4.24 ft | · | 97°F | 64 ft | Piscataqua-Salmon Falls |
|
Ashuelot River Near Gilsum, Nh
18 hours ago · USGS 01157000 |
13 cfs | 1.59 ft | 73°F | 94°F | 810 ft | Middle Connecticut |
|
Contoocook River At Peterborough, Nh
18 hours ago · USGS 01082000 |
11 cfs | 1.04 ft | · | 94°F | 751 ft | Contoocook |
|
Isinglass R At Rochester Neck Rd, Nh
18 hours ago · USGS 01072870 |
8 cfs | 2.84 ft | 73°F | 98°F | 112 ft | Piscataqua-Salmon Falls |
|
Spicket River Near Methuen, Nh
18 hours ago · USGS 01100561 |
6 cfs | 3.38 ft | · | 96°F | 109 ft | Merrimack |
|
Beaver Brook At North Pelham, Nh
18 hours ago · USGS 010965852 |
5 cfs | 5.61 ft | · | 97°F | 156 ft | Merrimack |
|
Winnicut River At Greenland, Nh
18 hours ago · USGS 01073785 |
4 cfs | 4.12 ft | · | 96°F | 4 ft | Piscataqua-Salmon Falls |
|
Oyster River Near Durham, Nh
18 hours ago · USGS 01073000 |
1 cfs | · | · | 98°F | 69 ft | Piscataqua-Salmon Falls |
|
Spicket River At North Salem, Nh
18 hours ago · USGS 01100505 |
0 cfs | 1.91 ft | · | 98°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
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.