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Web Portal Changes: The Advanced Hydrologic Prediction Service (AHPS) hosted at will be replaced by the National Water Prediction Service (NWPS), with a target of Spring 2024. Existing AHPS content and features will be preserved and expanded within NWPS. The NWS is now accepting feedback on NWPS. Please visit for more information.

Experimental National Water Center Products: Flood Inundation Mapping services are now available for 10% of the U.S. population. Please visit for more information. The National Hydrologic Discussion, Area Hydrologic Discussion, Flood Hazard Outlook, and real-time geospatial services depicting River Forecast Center and National Water Model forecasts, continue to be accessible via the URL above, as described in the StoryMap here.

DID YOU KNOW... Please try our new TEST hydrograph page link at: - Just replace “abcde” with your local hydrograph five character ID found in the lower left corner of the hydrograph.  In late March of 2024, the base URL path will become  Feedback can be provided HERE

Hydrograph River at a Glance Download
Connecticut River at Holyoke - Upper Pool (ft)Flow (kcfs)Highest Observation: 4.06 ft at 5:47AM Dec 06, 2023Observed: 3.74 ft at 7:12AM Dec 07, 2023Observed: 2.96 ft at 6:52AM Dec 08, 2023HLUM3(plotting HPIRZ) Graph Created (8:00AM Dec 8, 2023)ObservedLatest observed value: 2.96 ft at 6:52 AM EST 8-Dec-2023. Flood Stage is 9 ft
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About this graph
Tabular Data (UTC)
Tabular Data (EST)
XML Data
RSS Files
Datum: NGVD29
NOTE: Forecasts for the Connecticut River at Holyoke - Upper are issued as needed during times of high water, but are not routinely available.
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Upstream Gauge - at Northampton Upstream Gauge Downstream Gauge Downstream Gauge - at Holyoke
Flood Categories (in feet)
Major Flood Stage: 12
Moderate Flood Stage: 10
Flood Stage: 9
Action Stage: 8
Low Stage (in feet): -9999

Historic Crests
(1) 16.80 ft on 03/19/1936
(2) 14.90 ft on 09/22/1938
(3) 14.75 ft on 11/05/1927
(4) 13.20 ft on 04/20/1933
(5) 12.70 ft on 10/05/1869
(6) 12.70 ft on 03/29/1913
(7) 12.50 ft on 04/20/1862
(8) 12.10 ft on 04/08/1901
(9) 12.01 ft on 05/31/1984
(10) 12.00 ft on 04/06/1960
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 9.47 ft on 07/12/2023 (P)
(2) 10.40 ft on 08/30/2011
(3) 7.40 ft on 12/13/2008
(4) 8.90 ft on 04/17/2007
(5) 8.10 ft on 01/20/2006
(6) 9.80 ft on 10/09/2005
(7) 8.50 ft on 04/02/2004
(8) 8.66 ft on 10/30/2003
(9) 8.60 ft on 04/24/2001
(10) 8.25 ft on 04/01/1998
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) -6.00 ft on 08/26/1880
Zoom Level:16
KML Image
Gauge LocationGauge Map Marker
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
16 This is a serious flood situation. Widespread flooding along the Connecticut River from Hatfield and Hadley to Holyoke is likely. Action must be taken immediately to protect life and property. Follow the directions of your local emergency management officials. If you are asked to evacuate do so immediately.
12 Flooding along portions of Route 5 mainly north of Holyoke is expected. Some roadways may be closed due to flooding.
9 Lowland flooding in portions of Easthampton and South Hadley is likely.
About This Location Collapse

Latitude: 42.213889° N, Longitude: 72.602778° W, Horizontal Datum: NAD27

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 9 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)
(gauge height = flood stage)
Elevation information source
NAVD88 Not Available Not Available Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 97.47 106.47 Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks

Current/Historical Observations:

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.

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Hydrologic Resources Additional Resources
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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