Connecticut River Levels & Streamflow
As of Sep 12, 2026, Connecticut rivers are running at 74% of normal across 55 USGS gauges — the highest is 14,100 cfs on the Connecticut R At Middle Haddam. Live discharge, gauge height, and percent-of-normal for every USGS streamgauge in Connecticut.
Streamflow levels across Connecticut are currently 74% of normal, with the Connecticut R At Middle Haddam reporting the highest discharge in the state at 14,100 cfs and a gauge stage of 1.79 ft.
Meanwhile, the Connecticut River At Thompsonville 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 Connecticut's named rivers.
Active weather warnings for Connecticut
Connecticut residents should prepare for significant flooding risks through Sunday afternoon, September 13th. A Flood Watch remains in effect for southern Connecticut counties including Fairfield, New Haven, Middlesex, and New London, with the heaviest rainfall expected late Saturday night into Sunday morning. The National Weather Service forecasts 1-2 inches of rain with localized amounts reaching 3-5 inches possible, with peak hourly rates of 2-2.5 inches during thunderstorms. Major population centers including Bridgeport, New Haven, Stamford, and Waterbury should exercise caution as excessive runoff may cause flash flooding in poor drainage areas, rivers, creeks, and low-lying flood-prone locations. Residents are urged to avoid flooded roadways and monitor weather updates closely.
State-wide streamflow overview
The Connecticut 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 1.79 ft
Biggest 24h spike
Now 2,430 cfs
Network coverage
USGS gauges feeding 0 named rivers in Connecticut.
Where every gauge actually sits
One dot per Connecticut 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.
Connecticut streamflow, three water years
Statewide percent of normal, every day since Sep 2023. The dotted line is normal.
799 daily readings from 55 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%: 25 readings above that — including the 421% 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.
Connecticut USGS streamgauges
Every USGS gauge Snoflo tracks in Connecticut. 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 R At Middle Haddam, Ct
11 hours ago · USGS 01193050 |
7,840 cfs | 2.43 ft | 75°F | 76°F | 3 ft | Lower Connecticut |
|
Connecticut River At Thompsonville, Ct
11 hours ago · USGS 01184000 |
4,570 cfs | 7.88 ft | 73°F | 77°F | 36 ft | Lower Connecticut |
|
Housatonic River At Stevenson, Ct
11 hours ago · USGS 01205500 |
452 cfs | 2.45 ft | 63°F | 77°F | 38 ft | Housatonic |
|
Farmington River At Tariffville, Ct
11 hours ago · USGS 01189995 |
349 cfs | 1.26 ft | 72°F | 77°F | 161 ft | Farmington |
|
Housatonic River At Gaylordsville, Ct
10 hours ago · USGS 01200500 |
305 cfs | 1.80 ft | · | 77°F | 239 ft | Housatonic |
|
Housatonic River At Falls Village, Ct
11 hours ago · USGS 01199000 |
271 cfs | 2.00 ft | · | 77°F | 536 ft | Housatonic |
|
Farmington River At Unionville, Ct
11 hours ago · USGS 01188090 |
235 cfs | 4.99 ft | · | 77°F | 180 ft | Farmington |
|
Quinebaug River At Jewett City, Ct
11 hours ago · USGS 01127000 |
216 cfs | 4.72 ft | · | 77°F | 87 ft | Quinebaug |
|
West Branch Farmington River At Riverton, Ct
11 hours ago · USGS 01186000 |
209 cfs | 3.98 ft | 54°F | 75°F | 508 ft | Farmington |
|
Shetucket River At Taftville, Ct
10 hours ago · USGS 011230695 |
159 cfs | 4.87 ft | · | 77°F | 36 ft | Shetucket |
|
Naugatuck River At Beacon Falls, Ct
11 hours ago · USGS 01208500 |
120 cfs | 1.17 ft | 68°F | 77°F | 148 ft | Housatonic |
|
Shetucket River Near Willimantic, Ct
11 hours ago · USGS 01122500 |
112 cfs | 2.03 ft | · | 76°F | 156 ft | Shetucket |
|
Natchaug River At Willimantic, Ct
11 hours ago · USGS 01122000 |
82 cfs | 1.73 ft | · | 76°F | 167 ft | Shetucket |
|
Quinebaug River At Putnam, Ct
11 hours ago · USGS 01125500 |
76 cfs | 2.07 ft | · | 75°F | 229 ft | Quinebaug |
|
Quinnipiac River At Wallingford, Ct
10 hours ago · USGS 01196500 |
74 cfs | 2.62 ft | 53°F | 76°F | 93 ft | Quinnipiac |
|
Still River At Route 7 At Brookfield Center, Ct
11 hours ago · USGS 01201487 |
58 cfs | 6.75 ft | 49°F | 76°F | 268 ft | Housatonic |
|
Hockanum River Near East Hartford, Ct
11 hours ago · USGS 01192500 |
52 cfs | 1.85 ft | 56°F | 77°F | 88 ft | Lower Connecticut |
|
Quinebaug R At West Thompson, Ct
11 hours ago · USGS 01124151 |
43 cfs | · | · | 75°F | 313 ft | Quinebaug |
|
Pomperaug River At Southbury, Ct
10 hours ago · USGS 01204000 |
43 cfs | 2.76 ft | · | 76°F | 168 ft | Housatonic |
|
Saugatuck R Nr Westport, Ct
10 hours ago · USGS 01209500 |
39 cfs | 3.34 ft | · | 78°F | 22 ft | Saugatuck |
|
Quinebaug River At Quinebaug, Ct
10 hours ago · USGS 01124000 |
35 cfs | 2.36 ft | 73°F | 75°F | 353 ft | Quinebaug |
|
Willimantic River Near Coventry, Ct
11 hours ago · USGS 01119500 |
26 cfs | 2.43 ft | · | 76°F | 259 ft | Shetucket |
|
Salmon River Near East Hampton, Ct
11 hours ago · USGS 01193500 |
23 cfs | 2.17 ft | 42°F | 77°F | 82 ft | Lower Connecticut |
|
Yantic River At Yantic, Ct
11 hours ago · USGS 01127500 |
22 cfs | 1.12 ft | 61°F | 77°F | 123 ft | Thames |
|
Shepaug River At Peters Dam At Woodville, Ct
11 hours ago · USGS 01202501 |
20 cfs | 1.77 ft | · | 74°F | 771 ft | Housatonic |
|
French R At N Grosvenordale, Ct
11 hours ago · USGS 01125100 |
18 cfs | 6.53 ft | 63°F | 74°F | 348 ft | Quinebaug |
|
Pootatuck R At Sandy Hook, Ct
10 hours ago · USGS 01203510 |
18 cfs | 3.21 ft | · | 77°F | 241 ft | Housatonic |
|
Naugatuck River At Thomaston, Ct
11 hours ago · USGS 01206900 |
18 cfs | 1.62 ft | · | 74°F | 378 ft | Housatonic |
|
Norwalk R At South Wilton, Ct
11 hours ago · USGS 01209700 |
17 cfs | 1.24 ft | · | 77°F | 116 ft | Saugatuck |
|
Mill R Nr Hamden, Ct
11 hours ago · USGS 01196620 |
14 cfs | 1.29 ft | · | 76°F | 130 ft | Quinnipiac |
|
Saugatuck River Near Redding, Ct
11 hours ago · USGS 01208990 |
13 cfs | 1.43 ft | 67°F | 76°F | 282 ft | Saugatuck |
|
Mill R Nr Fairfield, Ct
11 hours ago · USGS 01208925 |
12 cfs | · | · | 77°F | 22 ft | Saugatuck |
|
Still River At Robertsville, Ct
11 hours ago · USGS 01186500 |
12 cfs | 1.45 ft | 63°F | 76°F | 519 ft | Farmington |
|
Weekeepeemee River At Hotchkissville, Ct
11 hours ago · USGS 01203805 |
12 cfs | 2.14 ft | · | 76°F | 254 ft | Housatonic |
|
Rooster River At Fairfield, Ct
10 hours ago · USGS 01208873 |
11 cfs | 3.26 ft | 51°F | 77°F | 19 ft | Saugatuck |
|
Quinnipiac River At Southington, Ct
11 hours ago · USGS 01195490 |
10 cfs | 2.91 ft | · | 77°F | 145 ft | Quinnipiac |
|
Coginchaug River At Middlefield, Ct
11 hours ago · USGS 01192883 |
10 cfs | 4.74 ft | · | 76°F | 147 ft | Lower Connecticut |
|
Little River Near Hanover, Ct
11 hours ago · USGS 01123000 |
9 cfs | 1.38 ft | · | 75°F | 270 ft | Shetucket |
|
East Branch Eightmile River Near North Lyme, Ct
11 hours ago · USGS 01194500 |
9 cfs | 1.72 ft | 63°F | 75°F | 112 ft | Lower Connecticut |
|
Broad Brook At Broad Brook, Ct
11 hours ago · USGS 01184490 |
9 cfs | · | 55°F | 77°F | 56 ft | Lower Connecticut |
|
Little River At Harrisville, Ct
11 hours ago · USGS 01125490 |
8 cfs | 1.43 ft | · | 75°F | 274 ft | Quinebaug |
|
Rippowam River At Stamford, Ct
11 hours ago · USGS 01209901 |
8 cfs | 1.33 ft | · | 78°F | 26 ft | Saugatuck |
|
Salmon Creek At Lime Rock, Ct
10 hours ago · USGS 01199050 |
7 cfs | · | · | 77°F | 627 ft | Housatonic |
|
Eightmile R At North Plain, Ct
11 hours ago · USGS 01194000 |
7 cfs | 2.59 ft | 56°F | 76°F | 69 ft | Lower Connecticut |
|
North Branch Park R At Hartford, Ct
11 hours ago · USGS 01191000 |
6 cfs | 1.50 ft | 67°F | 77°F | 59 ft | Lower Connecticut |
|
Nonewaug River At Minortown, Ct
11 hours ago · USGS 01203600 |
6 cfs | 2.91 ft | · | 76°F | 360 ft | Housatonic |
|
Mount Hope River Near Warrenville, Ct
11 hours ago · USGS 01121000 |
5 cfs | 1.01 ft | · | 76°F | 351 ft | Shetucket |
|
Sasco Brook Near Southport, Ct
11 hours ago · USGS 01208950 |
5 cfs | 1.26 ft | · | 77°F | 57 ft | Saugatuck |
|
Pendleton Hill Brook Near Clarks Falls, Ct
11 hours ago · USGS 01118300 |
3 cfs | 1.31 ft | · | 74°F | 158 ft | Pawcatuck-Wood |
|
Ridgefield Brook At Shields Lane Nr Ridgefield, Ct
11 hours ago · USGS 012095493 |
3 cfs | 1.77 ft | · | 76°F | 562 ft | Saugatuck |
|
Hubbard River Nr. West Hartland, Ct
11 hours ago · USGS 01187300 |
2 cfs | · | 64°F | 74°F | 644 ft | Farmington |
|
Indian River Near Clinton, Ct
11 hours ago · USGS 01195100 |
1 cfs | 1.57 ft | · | 76°F | 45 ft | Quinnipiac |
|
Stony Brook Near West Suffield, Ct
10 hours ago · USGS 01184100 |
1 cfs | 1.23 ft | · | 76°F | 173 ft | Lower Connecticut |
|
Burlington Brook Near Burlington, Ct
11 hours ago · USGS 01188000 |
1 cfs | 1.70 ft | 58°F | 75°F | 779 ft | Farmington |
|
Fivemile River Near New Canaan, Ct
10 hours ago · USGS 01209761 |
0 cfs | 1.81 ft | · | 77°F | 388 ft | Saugatuck |
See every Connecticut gauge ranked against normal.
- Percentile rank & % of median for all 55 gauges
- 15-day PULSE forecast on every gauge
- Custom flow alerts & full daily history
About Connecticut streamflow
What are river levels like in Connecticut right now?
As of September 12, 2026, Connecticut rivers are running at 74% of normal across 55 USGS streamgauges, and the Connecticut R At Middle Haddam is reporting the highest discharge at 14,100 cfs. The full sortable gauge table is below.
Which Connecticut river is running highest right now?
As of September 12, 2026, the highest discharge in Connecticut is 14,100 cfs on the Connecticut R At Middle Haddam. See the sortable gauge table for the full statewide ranking.
Are Connecticut rivers high or low right now?
Compare the statewide percent-of-normal on this page: above 100% means Connecticut 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 Connecticut 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 Connecticut 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 Connecticut 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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