Connecticut River river
Total streamflow across the Connecticut River was last observed at 76,642 cfs, and is expected to yield approximately 152,018 acre-ft of water today; about 71% of normal. Average streamflow for this time of year is 107,863 cfs, with recent peaks last observed on 2014-04-17 when daily discharge volume was observed at 548,550 cfs.
Maximum discharge along the river is currently at the Connecticut R At Middle Haddam reporting a streamflow rate of 25,200 cfs. However, the streamgauge with the highest stage along the river is the Connecticut River At Montague City with a gauge stage of 9.77 ft. This river is monitored from 10 different streamgauging stations along the Connecticut River, the highest being situated at an altitude of 1,211 ft, the Connecticut R Below Indian Stream Nr Pittsburg.
River streamflow levels
Daily aggregate streamflow across every monitored gauge along the Connecticut River. Use the range buttons to zoom in on a specific period.
Total streamflow
Sum of all monitored streamgauges · daily
Every streamgauge along the Connecticut River
All 10 USGS gauges Snoflo tracks for this river, with current flow, stage, recent change, percent of normal, and the gauge's all-time min / max. Click any header to sort. Cells are heatmapped relative to the column min/max -- darker blue = higher.
| Streamgauge▾ | Streamflow (cfs)▾ | Gauge stage (ft)▾ | 24h Δ (%)▾ | % Normal▾ | Min (cfs)▾ | Max (cfs)▾ | Elevation (ft)▾ |
|---|---|---|---|---|---|---|---|
|
Connecticut R Below Indian Stream Nr Pittsburg
NH
USGS 01129200
|
382 | 2.87 | -1.3 | 68% | 130 | 5,220 | 1,211 |
|
Connecticut River At North Stratford
NH
USGS 01129500
|
1,100 | 4.02 | 4.8 | 74% | 279 | 26,900 | 885 |
|
Connecticut River Near Dalton
NH
USGS 01131500
|
2,030 | 8.97 | -3.3 | 62% | 291 | 36,400 | 813 |
|
Connecticut River At Wells River
VT
USGS 01138500
|
3,780 | 3.61 | 2.2 | 88% | 566 | 41,600 | 403 |
|
Connecticut River At West Lebanon
NH
USGS 01144500
|
7,340 | 7.24 | 17.4 | 122% | 423 | 135,000 | 322 |
|
Connecticut River At North Walpole
NH
USGS 01154500
|
8,410 | 9.54 | 12.7 | 103% | 1,060 | 84,100 | 223 |
|
Connecticut River At Montague City
MA
USGS 01170500
|
8,240 | 9.77 | 17.7 | 68% | 1,140 | 126,000 | 111 |
|
Connecticut R At Interstate 391 Bridge At Holyoke
MA
USGS 01172010
|
9,560 | 7.35 | 4.6 | 77% | 889 | 107,000 | 43 |
|
Connecticut River At Thompsonville
CT
USGS 01184000
|
10,600 | 8.65 | 6.0 | 68% | 1,810 | 128,000 | 36 |
|
Connecticut R At Middle Haddam
CT
USGS 01193050
|
25,200 | 1.49 | 21.2 | 108% | 32 | 95,400 | 3 |
Maximum streamflow discharge by year
The single highest aggregate discharge recorded each year. Spotting the multi-year trend reveals droughts vs. wet cycles long before the headline daily flow does.
Annual peak discharge
From the river's full record · one point per water year
Streamflow elevation profile
Each bubble is one gauge along the river, plotted by current streamflow (x-axis) vs elevation (y-axis), sized by gauge stage. Reading top-to-bottom traces the river from headwaters down to its mouth -- you can see flow accumulate as elevation drops.
Elevation vs streamflow
One point per monitored gauge · bubble size = gauge stage
Connecticut River
The Connecticut River is the longest river in New England, stretching for 410 miles from its source in New Hampshire to its mouth at Long Island Sound. The river played a significant role in the industrial development of the region, serving as a major transportation route for goods and people. Today, the river is an important source of hydroelectric power, with several large dams and reservoirs along its length, including the Moore, Wilder, and Vernon dams. The river also supports a range of recreational activities, such as fishing, boating, and hiking, and provides water for agriculture in the Connecticut River Valley. Despite decades of pollution, the river has seen significant improvements in water quality and biodiversity in recent years due to restoration efforts.
Recreation along the Connecticut River
Fishing access and paddle runs Snoflo tracks within the watershed.
Paddle runs
- Begins Below The Tailrace Of The Rainbow Dam To The Confluence With The Connecticut River
- The Confluence Of The East And West Branches To The Confluence With The Farmington River In East Granby
- The Massachusetts-Connecticut State Line In Hartland To The Confluence With The Salmon Brook Main Stem
- The Hartland Headwaters To The Confluence With The Salmon Brook Main Stem
Track the Connecticut River in the Snoflo app
Set per-gauge push alerts (e.g. "alert me when flow at the Russian R Nr Healdsburg crosses 5,000 cfs"), and Snoflo's iOS app pushes the moment USGS reports the crossing.
About the Connecticut River
Where does the data for the Connecticut River come from?
Streamflow and gauge stage data are sourced from the U.S. Geological Survey (USGS) National Water Information System. The aggregate flow shown at the top of the page is computed by Snoflo as the sum of all monitored gauges along the river.
How is "percent of normal" calculated?
Today's aggregate streamflow is compared to the historical average aggregate streamflow on this calendar day across the river's full record. 100% means right on average; values above 100% indicate above-normal flow (wet year); values below indicate below-normal (dry year or drought).
Why are some gauges showing very different flows?
Gauges along a river measure flow at different points: headwater gauges read what's coming off the snowpack or mountain runoff; downstream gauges integrate everything upstream, including tributary inputs. Wide spreads usually mean a tributary is contributing significantly between gauges.
What's the elevation profile chart showing?
Each bubble is one gauge along the river, plotted by streamflow (x-axis) and elevation (y-axis), sized by gauge stage. Reading top-down traces the river from headwaters to mouth -- you can see flow build as elevation drops.
Can I get alerts when a specific gauge crosses a threshold?
Yes -- alerts are managed in the Snoflo iOS app on a per-gauge basis. Open any individual streamgauge from the table above and favorite it to set a discharge threshold.