Connecticut River Levels & Streamflow
As of Oct 17, 2026, Connecticut rivers are running at 58% of normal across 55 USGS gauges — the highest is 9,630 cfs on the Connecticut River At Thompsonville. Live discharge, gauge height, and percent-of-normal for every USGS streamgauge in Connecticut.
Connecticut river map
See Connecticut’s rivers on a live map
Every gauge, river and reservoir, one tap each:
- Rivers now — which are running high or low
- Reservoirs — how full each one is vs normal
- Rain — past 24 hrs and the 72-hr forecast, press play
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Connecticut river conditions today
Where rivers are running versus normal, what’s spiking and what’s coming — refreshed daily from USGS and NOAA.
Streamflow levels across Connecticut are currently 58% of normal, with the Connecticut River At Thompsonville reporting the highest discharge in the state at 9,630 cfs and a gauge stage of 8.55 ft.
Meanwhile, the Housatonic River At Stevenson is seeing a spike today — up -4% 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
A Freeze Warning is in effect for northern Connecticut counties through 9:00 AM EDT Sunday, October 18th, with temperatures expected to plummet to 30°F or lower. Northern Fairfield, Middlesex, New Haven, and New London Counties are most vulnerable to frost and freeze conditions that could devastate sensitive crops and vegetation. Residents in affected areas should take precautions to protect outdoor plants and prepare for potentially hazardous overnight conditions. Additionally, cooler and windier conditions are expected Saturday, with strong storms and an isolated tornado threat possible later in the evening. Stay alert to updated forecasts and heed all weather warnings from the National Weather Service.
How Connecticut’s rivers compare to normal
Every gauge placed by its own percent of normal, and three years of the statewide trend.
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 Oct 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%: 22 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 flow report
| Streamgage | Streamflow | Gage height | Water temp | Air temp | Elevation | Watershed |
|---|---|---|---|---|---|---|
|
Connecticut River At Thompsonville, Ct
5 hours ago · USGS 01184000 |
6,420 cfs | 8.17 ft | 60°F | 52°F | 36 ft | Lower Connecticut |
|
Connecticut R At Middle Haddam, Ct
4 hours ago · USGS 01193050 |
4,350 cfs | 2.24 ft | 59°F | 42°F | 3 ft | Lower Connecticut |
|
Housatonic River At Stevenson, Ct
5 hours ago · USGS 01205500 |
4,330 cfs | 6.94 ft | 63°F | 41°F | 38 ft | Housatonic |
|
Quinebaug River At Jewett City, Ct
5 hours ago · USGS 01127000 |
864 cfs | 6.19 ft | · | 40°F | 87 ft | Quinebaug |
|
Housatonic River At Gaylordsville, Ct
4 hours ago · USGS 01200500 |
662 cfs | 2.49 ft | · | 50°F | 239 ft | Housatonic |
|
Farmington River At Tariffville, Ct
4 hours ago · USGS 01189995 |
576 cfs | 1.69 ft | 72°F | 51°F | 161 ft | Farmington |
|
Shetucket River At Taftville, Ct
4 hours ago · USGS 011230695 |
486 cfs | 5.84 ft | · | 41°F | 36 ft | Shetucket |
|
Housatonic River At Falls Village, Ct
5 hours ago · USGS 01199000 |
446 cfs | 2.45 ft | · | 49°F | 536 ft | Housatonic |
|
Naugatuck River At Beacon Falls, Ct
5 hours ago · USGS 01208500 |
418 cfs | 2.37 ft | 68°F | 41°F | 148 ft | Housatonic |
|
Farmington River At Unionville, Ct
5 hours ago · USGS 01188090 |
383 cfs | 5.41 ft | · | 52°F | 180 ft | Farmington |
|
Shetucket River Near Willimantic, Ct
5 hours ago · USGS 01122500 |
347 cfs | 2.74 ft | · | 48°F | 156 ft | Shetucket |
|
Quinebaug River At Putnam, Ct
4 hours ago · USGS 01125500 |
251 cfs | 2.91 ft | · | 46°F | 229 ft | Quinebaug |
|
Quinnipiac River At Wallingford, Ct
4 hours ago · USGS 01196500 |
227 cfs | 3.68 ft | 53°F | 43°F | 93 ft | Quinnipiac |
|
Yantic River At Yantic, Ct
4 hours ago · USGS 01127500 |
172 cfs | 2.53 ft | 61°F | 41°F | 123 ft | Thames |
|
West Branch Farmington River At Riverton, Ct
5 hours ago · USGS 01186000 |
159 cfs | 3.82 ft | 60°F | 48°F | 508 ft | Farmington |
|
Still River At Route 7 At Brookfield Center, Ct
4 hours ago · USGS 01201487 |
156 cfs | 7.75 ft | 49°F | 41°F | 268 ft | Housatonic |
|
Quinebaug River At Quinebaug, Ct
4 hours ago · USGS 01124000 |
154 cfs | 2.87 ft | 73°F | 44°F | 353 ft | Quinebaug |
|
Pomperaug River At Southbury, Ct
4 hours ago · USGS 01204000 |
147 cfs | 3.53 ft | · | 40°F | 168 ft | Housatonic |
|
Salmon River Near East Hampton, Ct
4 hours ago · USGS 01193500 |
140 cfs | 2.98 ft | 42°F | 42°F | 82 ft | Lower Connecticut |
|
Hockanum River Near East Hartford, Ct
5 hours ago · USGS 01192500 |
136 cfs | 2.71 ft | 56°F | 49°F | 88 ft | Lower Connecticut |
|
Naugatuck River At Thomaston, Ct
5 hours ago · USGS 01206900 |
133 cfs | 2.29 ft | · | 42°F | 378 ft | Housatonic |
|
Quinebaug R At West Thompson, Ct
5 hours ago · USGS 01124151 |
125 cfs | 1.11 ft | · | 45°F | 313 ft | Quinebaug |
|
Willimantic River Near Coventry, Ct
5 hours ago · USGS 01119500 |
123 cfs | 3.25 ft | · | 48°F | 259 ft | Shetucket |
|
Saugatuck R Nr Westport, Ct
4 hours ago · USGS 01209500 |
113 cfs | 3.79 ft | · | 41°F | 22 ft | Saugatuck |
|
Still River At Robertsville, Ct
5 hours ago · USGS 01186500 |
106 cfs | 2.30 ft | 63°F | 49°F | 519 ft | Farmington |
|
French R At N Grosvenordale, Ct
5 hours ago · USGS 01125100 |
105 cfs | 7.10 ft | 63°F | 44°F | 348 ft | Quinebaug |
|
Little River Near Hanover, Ct
5 hours ago · USGS 01123000 |
67 cfs | 2.11 ft | · | 48°F | 270 ft | Shetucket |
|
Coginchaug River At Middlefield, Ct
4 hours ago · USGS 01192883 |
62 cfs | 5.77 ft | · | 43°F | 147 ft | Lower Connecticut |
|
Weekeepeemee River At Hotchkissville, Ct
5 hours ago · USGS 01203805 |
57 cfs | 2.69 ft | · | 43°F | 254 ft | Housatonic |
|
Natchaug River At Willimantic, Ct
5 hours ago · USGS 01122000 |
55 cfs | 1.53 ft | · | 48°F | 167 ft | Shetucket |
|
Mill R Nr Hamden, Ct
5 hours ago · USGS 01196620 |
55 cfs | 1.58 ft | · | 43°F | 130 ft | Quinnipiac |
|
Eightmile R At North Plain, Ct
4 hours ago · USGS 01194000 |
53 cfs | 3.20 ft | 56°F | 42°F | 69 ft | Lower Connecticut |
|
East Branch Eightmile River Near North Lyme, Ct
4 hours ago · USGS 01194500 |
53 cfs | 2.41 ft | 58°F | 42°F | 112 ft | Lower Connecticut |
|
Hubbard River Nr. West Hartland, Ct
5 hours ago · USGS 01187300 |
50 cfs | 1.89 ft | 64°F | 47°F | 644 ft | Farmington |
|
Salmon Creek At Lime Rock, Ct
4 hours ago · USGS 01199050 |
49 cfs | 1.29 ft | · | 49°F | 627 ft | Housatonic |
|
Pootatuck R At Sandy Hook, Ct
4 hours ago · USGS 01203510 |
48 cfs | 3.85 ft | · | 39°F | 241 ft | Housatonic |
|
Norwalk R At South Wilton, Ct
5 hours ago · USGS 01209700 |
44 cfs | 1.50 ft | · | 42°F | 116 ft | Saugatuck |
|
Saugatuck River Near Redding, Ct
5 hours ago · USGS 01208990 |
39 cfs | 1.95 ft | 67°F | 41°F | 282 ft | Saugatuck |
|
Nonewaug River At Minortown, Ct
4 hours ago · USGS 01203600 |
37 cfs | 3.47 ft | · | 43°F | 360 ft | Housatonic |
|
North Branch Park R At Hartford, Ct
4 hours ago · USGS 01191000 |
35 cfs | 2.00 ft | 58°F | 52°F | 59 ft | Lower Connecticut |
|
Mount Hope River Near Warrenville, Ct
5 hours ago · USGS 01121000 |
33 cfs | 1.71 ft | · | 47°F | 351 ft | Shetucket |
|
Quinnipiac River At Southington, Ct
4 hours ago · USGS 01195490 |
32 cfs | 3.44 ft | · | 48°F | 145 ft | Quinnipiac |
|
Rippowam River At Stamford, Ct
4 hours ago · USGS 01209901 |
28 cfs | 1.66 ft | · | 42°F | 26 ft | Saugatuck |
|
Little River At Harrisville, Ct
4 hours ago · USGS 01125490 |
27 cfs | 1.78 ft | · | 46°F | 274 ft | Quinebaug |
|
Rooster River At Fairfield, Ct
4 hours ago · USGS 01208873 |
20 cfs | 3.58 ft | 51°F | 41°F | 19 ft | Saugatuck |
|
Sasco Brook Near Southport, Ct
5 hours ago · USGS 01208950 |
18 cfs | 1.58 ft | · | 42°F | 57 ft | Saugatuck |
|
Broad Brook At Broad Brook, Ct
4 hours ago · USGS 01184490 |
15 cfs | · | 55°F | 52°F | 56 ft | Lower Connecticut |
|
Shepaug River At Peters Dam At Woodville, Ct
5 hours ago · USGS 01202501 |
14 cfs | 1.47 ft | · | 47°F | 771 ft | Housatonic |
|
Pendleton Hill Brook Near Clarks Falls, Ct
4 hours ago · USGS 01118300 |
13 cfs | 1.69 ft | · | 42°F | 158 ft | Pawcatuck-Wood |
|
Mill R Nr Fairfield, Ct
5 hours ago · USGS 01208925 |
13 cfs | · | · | 42°F | 22 ft | Saugatuck |
|
Stony Brook Near West Suffield, Ct
4 hours ago · USGS 01184100 |
10 cfs | 1.53 ft | · | 51°F | 173 ft | Lower Connecticut |
|
Burlington Brook Near Burlington, Ct
4 hours ago · USGS 01188000 |
8 cfs | 2.45 ft | 58°F | 49°F | 779 ft | Farmington |
|
Indian River Near Clinton, Ct
4 hours ago · USGS 01195100 |
8 cfs | 1.93 ft | · | 42°F | 45 ft | Quinnipiac |
|
Ridgefield Brook At Shields Lane Nr Ridgefield, Ct
5 hours ago · USGS 012095493 |
5 cfs | 1.92 ft | · | 41°F | 562 ft | Saugatuck |
|
Fivemile River Near New Canaan, Ct
4 hours ago · USGS 01209761 |
0 cfs | 1.89 ft | · | 42°F | 388 ft | Saugatuck |
About Connecticut streamflow
What are river levels like in Connecticut right now?
As of October 17, 2026, Connecticut rivers are running at 58% of normal across 55 USGS streamgauges, and the Connecticut River At Thompsonville is reporting the highest discharge at 9,630 cfs. The full sortable gauge table is below.
Which Connecticut river is running highest right now?
As of October 17, 2026, the highest discharge in Connecticut is 9,630 cfs on the Connecticut River At Thompsonville. 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.