Connecticut streamflow
Live discharge, gauge height, water temperature, and percent-of-normal readings from every USGS streamgauge in Connecticut. Built for paddlers, anglers, water managers, and flood researchers.
Streamflow levels across Connecticut are currently 39% of normal, with the Connecticut R At Middle Haddam reporting the highest discharge in the state at 5,720 cfs and a gauge stage of 2.18 ft.
Meanwhile, the Connecticut River At Thompsonville is seeing a spike today — up 18% 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
**Air Quality Alert in Effect** – Connecticut residents in Fairfield, New Haven, Middlesex, and New London counties should take precautions through midnight tonight due to an Air Quality Action Day issued by the Connecticut Department of Energy and Environmental Protection. Fine particulate levels may approach or exceed unhealthy standards, affecting major population centers including Bridgeport, New Haven, Stamford, and Waterbury. Vulnerable populations, including children, elderly residents, and those with respiratory conditions, should limit outdoor activities and consider using air purifiers indoors. For real-time air quality updates and health recommendations, visit ct.gov/deep/aqi.
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 2.18 ft
Biggest 24h spike
Now 5,530 cfs
Network coverage
USGS gauges feeding 0 named rivers in Connecticut.
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
1 day ago · USGS 01193050 |
5,720 cfs | 3.39 ft | 81°F | 84°F | 3 ft | Lower Connecticut |
|
Connecticut River At Thompsonville, Ct
10 hours ago · USGS 01184000 |
4,740 cfs | 7.91 ft | 79°F | 84°F | 36 ft | Lower Connecticut |
|
Housatonic River At Stevenson, Ct
10 hours ago · USGS 01205500 |
455 cfs | 2.46 ft | 63°F | 84°F | 38 ft | Housatonic |
|
Housatonic River At Gaylordsville, Ct
11 hours ago · USGS 01200500 |
384 cfs | 1.99 ft | · | 82°F | 239 ft | Housatonic |
|
Farmington River At Tariffville, Ct
10 hours ago · USGS 01189995 |
263 cfs | 1.05 ft | 72°F | 84°F | 161 ft | Farmington |
|
Housatonic River At Falls Village, Ct
10 hours ago · USGS 01199000 |
255 cfs | 2.04 ft | · | 81°F | 536 ft | Housatonic |
|
Quinebaug River At Jewett City, Ct
10 hours ago · USGS 01127000 |
213 cfs | 4.71 ft | · | 84°F | 87 ft | Quinebaug |
|
Shetucket River At Taftville, Ct
11 hours ago · USGS 011230695 |
145 cfs | 4.81 ft | · | 85°F | 36 ft | Shetucket |
|
Farmington River At Unionville, Ct
10 hours ago · USGS 01188090 |
143 cfs | 4.63 ft | · | 83°F | 180 ft | Farmington |
|
Quinebaug R At West Thompson, Ct
10 hours ago · USGS 01124151 |
142 cfs | 1.19 ft | · | 82°F | 313 ft | Quinebaug |
|
West Branch Farmington River At Riverton, Ct
10 hours ago · USGS 01186000 |
119 cfs | 3.67 ft | 46°F | 80°F | 508 ft | Farmington |
|
Quinebaug River At Putnam, Ct
10 hours ago · USGS 01125500 |
113 cfs | 2.29 ft | · | 82°F | 229 ft | Quinebaug |
|
Naugatuck River At Beacon Falls, Ct
10 hours ago · USGS 01208500 |
113 cfs | 1.12 ft | 68°F | 83°F | 148 ft | Housatonic |
|
Shetucket River Near Willimantic, Ct
10 hours ago · USGS 01122500 |
109 cfs | 2.02 ft | · | 83°F | 156 ft | Shetucket |
|
Quinnipiac River At Wallingford, Ct
11 hours ago · USGS 01196500 |
74 cfs | 2.62 ft | 53°F | 85°F | 93 ft | Quinnipiac |
|
Natchaug River At Willimantic, Ct
10 hours ago · USGS 01122000 |
73 cfs | 1.66 ft | · | 83°F | 167 ft | Shetucket |
|
Still River At Route 7 At Brookfield Center, Ct
10 hours ago · USGS 01201487 |
58 cfs | 6.74 ft | 49°F | 82°F | 268 ft | Housatonic |
|
Hockanum River Near East Hartford, Ct
10 hours ago · USGS 01192500 |
46 cfs | 1.83 ft | 56°F | 85°F | 88 ft | Lower Connecticut |
|
Quinebaug River At Quinebaug, Ct
11 hours ago · USGS 01124000 |
45 cfs | 2.43 ft | 73°F | 81°F | 353 ft | Quinebaug |
|
Willimantic River Near Coventry, Ct
10 hours ago · USGS 01119500 |
32 cfs | 2.51 ft | · | 83°F | 259 ft | Shetucket |
|
Pomperaug River At Southbury, Ct
11 hours ago · USGS 01204000 |
28 cfs | 2.60 ft | · | 82°F | 168 ft | Housatonic |
|
French R At N Grosvenordale, Ct
10 hours ago · USGS 01125100 |
25 cfs | 6.61 ft | 63°F | 81°F | 348 ft | Quinebaug |
|
Naugatuck River At Thomaston, Ct
10 hours ago · USGS 01206900 |
22 cfs | 1.67 ft | · | 80°F | 378 ft | Housatonic |
|
Shepaug River At Peters Dam At Woodville, Ct
10 hours ago · USGS 01202501 |
20 cfs | 1.78 ft | · | 78°F | 771 ft | Housatonic |
|
Salmon River Near East Hampton, Ct
10 hours ago · USGS 01193500 |
16 cfs | 2.13 ft | 42°F | 84°F | 82 ft | Lower Connecticut |
|
Still River At Robertsville, Ct
10 hours ago · USGS 01186500 |
15 cfs | 1.45 ft | 63°F | 81°F | 519 ft | Farmington |
|
Pootatuck R At Sandy Hook, Ct
11 hours ago · USGS 01203510 |
15 cfs | 3.10 ft | · | 83°F | 241 ft | Housatonic |
|
Yantic River At Yantic, Ct
10 hours ago · USGS 01127500 |
14 cfs | · | 61°F | 84°F | 123 ft | Thames |
|
Norwalk R At South Wilton, Ct
10 hours ago · USGS 01209700 |
13 cfs | 1.18 ft | · | 85°F | 116 ft | Saugatuck |
|
Saugatuck R Nr Westport, Ct
11 hours ago · USGS 01209500 |
13 cfs | 3.06 ft | · | 85°F | 22 ft | Saugatuck |
|
Broad Brook At Broad Brook, Ct
10 hours ago · USGS 01184490 |
11 cfs | · | 55°F | 84°F | 56 ft | Lower Connecticut |
|
Mill R Nr Hamden, Ct
10 hours ago · USGS 01196620 |
10 cfs | 1.24 ft | · | 84°F | 130 ft | Quinnipiac |
|
Quinnipiac River At Southington, Ct
10 hours ago · USGS 01195490 |
10 cfs | 2.89 ft | · | 84°F | 145 ft | Quinnipiac |
|
Coginchaug River At Middlefield, Ct
11 hours ago · USGS 01192883 |
9 cfs | 4.69 ft | · | 84°F | 147 ft | Lower Connecticut |
|
Salmon Creek At Lime Rock, Ct
11 hours ago · USGS 01199050 |
9 cfs | · | · | 81°F | 627 ft | Housatonic |
|
Little River Near Hanover, Ct
10 hours ago · USGS 01123000 |
8 cfs | 1.38 ft | · | 83°F | 270 ft | Shetucket |
|
Little River At Harrisville, Ct
11 hours ago · USGS 01125490 |
8 cfs | 1.43 ft | · | 82°F | 274 ft | Quinebaug |
|
Saugatuck River Near Redding, Ct
11 hours ago · USGS 01208990 |
8 cfs | 1.26 ft | 67°F | 83°F | 282 ft | Saugatuck |
|
Mill R Nr Fairfield, Ct
10 hours ago · USGS 01208925 |
8 cfs | · | · | 85°F | 22 ft | Saugatuck |
|
Weekeepeemee River At Hotchkissville, Ct
10 hours ago · USGS 01203805 |
7 cfs | 2.10 ft | · | 81°F | 254 ft | Housatonic |
|
East Branch Eightmile River Near North Lyme, Ct
10 hours ago · USGS 01194500 |
4 cfs | 1.56 ft | 70°F | 83°F | 112 ft | Lower Connecticut |
|
Rooster River At Fairfield, Ct
10 hours ago · USGS 01208873 |
4 cfs | 3.09 ft | 51°F | 85°F | 19 ft | Saugatuck |
|
North Branch Park R At Hartford, Ct
11 hours ago · USGS 01191000 |
4 cfs | 1.42 ft | 74°F | 85°F | 59 ft | Lower Connecticut |
|
Rippowam River At Stamford, Ct
10 hours ago · USGS 01209901 |
4 cfs | 1.21 ft | · | 85°F | 26 ft | Saugatuck |
|
Nonewaug River At Minortown, Ct
10 hours ago · USGS 01203600 |
4 cfs | 2.83 ft | · | 81°F | 360 ft | Housatonic |
|
Mount Hope River Near Warrenville, Ct
10 hours ago · USGS 01121000 |
4 cfs | · | · | 82°F | 351 ft | Shetucket |
|
Eightmile R At North Plain, Ct
10 hours ago · USGS 01194000 |
3 cfs | 2.51 ft | 56°F | 84°F | 69 ft | Lower Connecticut |
|
Sasco Brook Near Southport, Ct
10 hours ago · USGS 01208950 |
2 cfs | 1.05 ft | · | 85°F | 57 ft | Saugatuck |
|
Ridgefield Brook At Shields Lane Nr Ridgefield, Ct
10 hours ago · USGS 012095493 |
2 cfs | 1.73 ft | · | 83°F | 562 ft | Saugatuck |
|
Hubbard River Nr. West Hartland, Ct
10 hours ago · USGS 01187300 |
2 cfs | · | 64°F | 79°F | 644 ft | Farmington |
|
Burlington Brook Near Burlington, Ct
10 hours ago · USGS 01188000 |
1 cfs | 1.74 ft | 58°F | 81°F | 779 ft | Farmington |
|
Stony Brook Near West Suffield, Ct
11 hours ago · USGS 01184100 |
1 cfs | 1.21 ft | · | 84°F | 173 ft | Lower Connecticut |
|
Pendleton Hill Brook Near Clarks Falls, Ct
10 hours ago · USGS 01118300 |
1 cfs | 1.09 ft | · | 84°F | 158 ft | Pawcatuck-Wood |
|
Indian River Near Clinton, Ct
10 hours ago · USGS 01195100 |
1 cfs | 1.52 ft | · | 83°F | 45 ft | Quinnipiac |
|
Fivemile River Near New Canaan, Ct
11 hours ago · USGS 01209761 |
0 cfs | 1.81 ft | · | 84°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
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.