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This probabilistic forecast is issued by the Northeast River Forecast Center.
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Experimental Short Range Forecast Uncertainty (AHPS) - External Links: Product Description Document | Customer Survey
About this graph
Forecasts for the Connecticut River at Thompsonville are issued routinely year-round.

Vertical datum height surveyed by the USGS

Return to Area Map

Downstream Gauge Downstream Gauge - at Hartford
Zoom Level:16
Flood Categories (in feet)
Major Flood Stage: 19
Moderate Flood Stage: 17
Flood Stage: 15
Action Stage: 14
Low Stage (in feet): -9999

Historic Crests
(1) 26.60 ft on 03/20/1936
(2) 24.40 ft on 07/23/1938
(3) 20.93 ft on 08/19/1955
(4) 20.80 ft on 05/31/1984
(5) 20.47 ft on 04/20/1933
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 15.08 ft on 12/27/2020 (P)
(2) 15.34 ft on 04/28/2019
(3) 15.18 ft on 04/23/2019
(4) 15.54 ft on 04/17/2019
(5) 15.34 ft on 12/23/2018
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.
KML Image
Gauge LocationGauge Map Marker
 Disclaimer
Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.
Flood Impacts & Photos Collapse
If you notice any errors in the below information, please contact our Webmaster
18 Significant and widespread flooding along the river can be expected from the Massachusetts towns of Agawam and Longmeadow, through the northern Connecticut towns of Suffield and Enfield.
17 Flooding will become more widespread along the Connecticut River from the Massachusetts towns of Agawam and Longmeadow, through the northern Connecticut towns of Suffield and Enfield.
16 Flooding impacts low lying areas along the Connecticut River from the Massachusetts towns of Agawam and Longmeadow, through the northern Connecticut towns of Suffield and Enfield.
15 Lowland flooding will begin along the Connecticut River near Thompsonville.

Other Real-time and/or Archive Data Sources:
Additional Information Collapse
Potential River Levels - Used to
Potential River Levels
Used to Estimate the Chance of Flooding and the Range of Possible River Levels
10 Day (HEFS) 7 Day (NAEFS) 7 Day (GEFS)
HEFS Ensemble NAEFS Ensemble GEFS Ensemble

Note: Use the official hydrograph at the top of this web page for river levels within the next 72 hours.

Click individual graphics to enlarge.
Collaborative Agencies Collapse
The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.
NWS Information
National Weather Service
Boston / Norton Weather Forecast Office
46 Commerce Way
Norton, MA 02766
(508) 622-3250
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