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Hydrograph River at a Glance Download
Connecticut River at Middle Haddam Stage (ft)Observed: 4.42 ft at 5:15PM May 11, 2024Observed: 4.38 ft at 5:30PM May 11, 2024Observed: 4.33 ft at 5:45PM May 11, 2024Observed: 4.28 ft at 6:00PM May 11, 2024Observed: 4.24 ft at 6:15PM May 11, 2024Observed: 4.18 ft at 6:30PM May 11, 2024Observed: 4.11 ft at 6:45PM May 11, 2024Observed: 4.05 ft at 7:00PM May 11, 2024Observed: 3.97 ft at 7:15PM May 11, 2024Observed: 3.91 ft at 7:30PM May 11, 2024Observed: 3.83 ft at 7:45PM May 11, 2024Observed: 3.76 ft at 8:00PM May 11, 2024Observed: 3.7 ft at 8:15PM May 11, 2024Observed: 3.63 ft at 8:30PM May 11, 2024Observed: 3.58 ft at 8:45PM May 11, 2024Observed: 3.52 ft at 9:00PM May 11, 2024Observed: 3.45 ft at 9:15PM May 11, 2024Observed: 3.4 ft at 9:30PM May 11, 2024Observed: 3.35 ft at 9:45PM May 11, 2024Observed: 3.3 ft at 10:00PM May 11, 2024Observed: 3.25 ft at 10:15PM May 11, 2024Observed: 3.22 ft at 10:30PM May 11, 2024Observed: 3.18 ft at 10:45PM May 11, 2024Observed: 3.16 ft at 11:00PM May 11, 2024Observed: 3.14 ft at 11:15PM May 11, 2024Observed: 3.14 ft at 11:30PM May 11, 2024Observed: 3.15 ft at 11:45PM May 11, 2024Observed: 3.17 ft at 12:00AM May 12, 2024Observed: 3.22 ft at 12:15AM May 12, 2024Observed: 3.29 ft at 12:30AM May 12, 2024Observed: 3.38 ft at 12:45AM May 12, 2024Observed: 3.49 ft at 1:00AM May 12, 2024Observed: 3.63 ft at 1:15AM May 12, 2024Observed: 3.77 ft at 1:30AM May 12, 2024Observed: 3.91 ft at 1:45AM May 12, 2024Observed: 4.03 ft at 2:00AM May 12, 2024Observed: 4.15 ft at 2:15AM May 12, 2024Observed: 4.26 ft at 2:30AM May 12, 2024Observed: 4.36 ft at 2:45AM May 12, 2024Observed: 4.46 ft at 3:00AM May 12, 2024Observed: 4.56 ft at 3:15AM May 12, 2024Observed: 4.63 ft at 3:30AM May 12, 2024Observed: 4.69 ft at 3:45AM May 12, 2024Highest Observation: 4.71 ft at 4:00AM May 12, 2024Highest Observation: 4.71 ft at 4:15AM May 12, 2024Observed: 4.68 ft at 4:30AM May 12, 2024Observed: 4.64 ft at 4:45AM May 12, 2024Observed: 4.59 ft at 5:00AM May 12, 2024Observed: 4.53 ft at 5:15AM May 12, 2024Observed: 4.47 ft at 5:30AM May 12, 2024Observed: 4.42 ft at 5:45AM May 12, 2024Observed: 4.36 ft at 6:00AM May 12, 2024Observed: 4.28 ft at 6:15AM May 12, 2024Observed: 4.22 ft at 6:30AM May 12, 2024Observed: 4.14 ft at 6:45AM May 12, 2024Observed: 4.06 ft at 7:00AM May 12, 2024Observed: 3.97 ft at 7:15AM May 12, 2024Observed: 3.89 ft at 7:30AM May 12, 2024Observed: 3.8 ft at 7:45AM May 12, 2024Observed: 3.72 ft at 8:00AM May 12, 2024Observed: 3.64 ft at 8:15AM May 12, 2024Observed: 3.55 ft at 8:30AM May 12, 2024Observed: 3.47 ft at 8:45AM May 12, 2024Observed: 3.4 ft at 9:00AM May 12, 2024Observed: 3.31 ft at 9:15AM May 12, 2024Observed: 3.23 ft at 9:30AM May 12, 2024Observed: 3.16 ft at 9:45AM May 12, 2024Observed: 3.09 ft at 10:00AM May 12, 2024Observed: 3.03 ft at 10:15AM May 12, 2024Observed: 2.97 ft at 10:30AM May 12, 2024Observed: 2.91 ft at 10:45AM May 12, 2024Observed: 2.86 ft at 11:00AM May 12, 2024Observed: 2.82 ft at 11:15AM May 12, 2024Observed: 2.78 ft at 11:30AM May 12, 2024Observed: 2.74 ft at 11:45AM May 12, 2024Observed: 2.72 ft at 12:00PM May 12, 2024Observed: 2.7 ft at 12:15PM May 12, 2024Observed: 2.69 ft at 12:30PM May 12, 2024Observed: 2.7 ft at 12:45PM May 12, 2024Observed: 2.71 ft at 1:00PM May 12, 2024Observed: 2.75 ft at 1:15PM May 12, 2024Observed: 2.82 ft at 1:30PM May 12, 2024Observed: 2.91 ft at 1:45PM May 12, 2024Observed: 3.03 ft at 2:00PM May 12, 2024Observed: 3.16 ft at 2:15PM May 12, 2024Observed: 3.26 ft at 2:30PM May 12, 2024Observed: 3.37 ft at 2:45PM May 12, 2024Observed: 3.47 ft at 3:00PM May 12, 2024Observed: 3.56 ft at 3:15PM May 12, 2024Observed: 3.64 ft at 3:30PM May 12, 2024Observed: 3.73 ft at 3:45PM May 12, 2024Observed: 3.81 ft at 4:00PM May 12, 2024Observed: 3.89 ft at 4:15PM May 12, 2024Observed: 3.96 ft at 4:30PM May 12, 2024Observed: 3.99 ft at 4:45PM May 12, 2024Observed: 4 ft at 5:00PM May 12, 2024Observed: 4 ft at 5:15PM May 12, 2024Observed: 3.97 ft at 5:30PM May 12, 2024Observed: 3.94 ft at 5:45PM May 12, 2024Observed: 3.9 ft at 6:00PM May 12, 2024Observed: 3.85 ft at 6:15PM May 12, 2024Observed: 3.8 ft at 6:30PM May 12, 2024Observed: 3.74 ft at 6:45PM May 12, 2024Observed: 3.69 ft at 7:00PM May 12, 2024Observed: 3.63 ft at 7:15PM May 12, 2024Observed: 3.56 ft at 7:30PM May 12, 2024Observed: 3.49 ft at 7:45PM May 12, 2024Observed: 3.42 ft at 8:00PM May 12, 2024Observed: 3.35 ft at 8:15PM May 12, 2024Observed: 3.27 ft at 8:30PM May 12, 2024Observed: 3.21 ft at 8:45PM May 12, 2024Observed: 3.14 ft at 9:00PM May 12, 2024Observed: 3.08 ft at 9:15PM May 12, 2024Observed: 3.02 ft at 9:30PM May 12, 2024Observed: 2.96 ft at 9:45PM May 12, 2024Observed: 2.9 ft at 10:00PM May 12, 2024Observed: 2.85 ft at 10:15PM May 12, 2024Observed: 2.79 ft at 10:30PM May 12, 2024Observed: 2.75 ft at 10:45PM May 12, 2024Observed: 2.7 ft at 11:00PM May 12, 2024Observed: 2.67 ft at 11:15PM May 12, 2024Observed: 2.63 ft at 11:30PM May 12, 2024Observed: 2.6 ft at 11:45PM May 12, 2024Observed: 2.57 ft at 12:00AM May 13, 2024Observed: 2.55 ft at 12:15AM May 13, 2024Observed: 2.55 ft at 12:30AM May 13, 2024Observed: 2.56 ft at 12:45AM May 13, 2024Observed: 2.58 ft at 1:00AM May 13, 2024Observed: 2.64 ft at 1:15AM May 13, 2024Observed: 2.72 ft at 1:30AM May 13, 2024Observed: 2.81 ft at 1:45AM May 13, 2024Observed: 2.95 ft at 2:00AM May 13, 2024Observed: 3.08 ft at 2:15AM May 13, 2024Observed: 3.22 ft at 2:30AM May 13, 2024Observed: 3.35 ft at 2:45AM May 13, 2024Observed: 3.46 ft at 3:00AM May 13, 2024Observed: 3.57 ft at 3:15AM May 13, 2024Observed: 3.67 ft at 3:30AM May 13, 2024Observed: 3.76 ft at 3:45AM May 13, 2024Observed: 3.84 ft at 4:00AM May 13, 2024Observed: 3.9 ft at 4:15AM May 13, 2024Observed: 3.95 ft at 4:30AM May 13, 2024Observed: 3.98 ft at 4:45AM May 13, 2024Observed: 4 ft at 5:00AM May 13, 2024Observed: 4 ft at 5:15AM May 13, 2024Observed: 3.98 ft at 5:30AM May 13, 2024Observed: 3.94 ft at 5:45AM May 13, 2024Observed: 3.9 ft at 6:00AM May 13, 2024Observed: 3.85 ft at 6:15AM May 13, 2024Observed: 3.79 ft at 6:30AM May 13, 2024Observed: 3.73 ft at 6:45AM May 13, 2024Observed: 3.67 ft at 7:00AM May 13, 2024Observed: 3.6 ft at 7:15AM May 13, 2024Observed: 3.53 ft at 7:30AM May 13, 2024Observed: 3.46 ft at 7:45AM May 13, 2024Observed: 3.38 ft at 8:00AM May 13, 2024Observed: 3.3 ft at 8:15AM May 13, 2024Observed: 3.23 ft at 8:30AM May 13, 2024Observed: 3.14 ft at 8:45AM May 13, 2024Observed: 3.06 ft at 9:00AM May 13, 2024Observed: 2.99 ft at 9:15AM May 13, 2024Observed: 2.91 ft at 9:30AM May 13, 2024Observed: 2.84 ft at 9:45AM May 13, 2024Observed: 2.77 ft at 10:00AM May 13, 2024Observed: 2.7 ft at 10:15AM May 13, 2024Observed: 2.62 ft at 10:30AM May 13, 2024Observed: 2.56 ft at 10:45AM May 13, 2024Observed: 2.5 ft at 11:00AM May 13, 2024Observed: 2.44 ft at 11:15AM May 13, 2024Observed: 2.39 ft at 11:30AM May 13, 2024Observed: 2.33 ft at 11:45AM May 13, 2024Observed: 2.29 ft at 12:00PM May 13, 2024Observed: 2.26 ft at 12:15PM May 13, 2024Observed: 2.23 ft at 12:30PM May 13, 2024Observed: 2.2 ft at 12:45PM May 13, 2024Observed: 2.17 ft at 1:00PM May 13, 2024Observed: 2.17 ft at 1:15PM May 13, 2024Observed: 2.16 ft at 1:30PM May 13, 2024Observed: 2.19 ft at 1:45PM May 13, 2024Observed: 2.21 ft at 2:00PM May 13, 2024Observed: 2.26 ft at 2:15PM May 13, 2024Observed: 2.34 ft at 2:30PM May 13, 2024Observed: 2.43 ft at 2:45PM May 13, 2024Observed: 2.57 ft at 3:00PM May 13, 2024Observed: 2.69 ft at 3:15PM May 13, 2024Observed: 2.84 ft at 3:30PM May 13, 2024Observed: 2.95 ft at 3:45PM May 13, 2024Observed: 3.06 ft at 4:00PM May 13, 2024Observed: 3.17 ft at 4:15PM May 13, 2024Observed: 3.25 ft at 4:30PM May 13, 2024Observed: 3.32 ft at 4:45PM May 13, 2024Observed: 3.37 ft at 5:00PM May 13, 2024Observed: 3.42 ft at 5:15PM May 13, 2024Observed: 3.45 ft at 5:30PM May 13, 2024Observed: 3.45 ft at 5:45PM May 13, 2024Observed: 3.46 ft at 6:00PM May 13, 2024Observed: 3.45 ft at 6:15PM May 13, 2024Observed: 3.42 ft at 6:30PM May 13, 2024Observed: 3.38 ft at 6:45PM May 13, 2024Observed: 3.34 ft at 7:00PM May 13, 2024Observed: 3.3 ft at 7:15PM May 13, 2024Observed: 3.24 ft at 7:30PM May 13, 2024Observed: 3.2 ft at 7:45PM May 13, 2024Observed: 3.13 ft at 8:00PM May 13, 2024Observed: 3.07 ft at 8:15PM May 13, 2024Observed: 3 ft at 8:30PM May 13, 2024Observed: 2.93 ft at 8:45PM May 13, 2024Observed: 2.87 ft at 9:00PM May 13, 2024Observed: 2.8 ft at 9:15PM May 13, 2024Observed: 2.74 ft at 9:30PM May 13, 2024Observed: 2.66 ft at 9:45PM May 13, 2024Observed: 2.6 ft at 10:00PM May 13, 2024Observed: 2.54 ft at 10:15PM May 13, 2024Observed: 2.48 ft at 10:30PM May 13, 2024Observed: 2.42 ft at 10:45PM May 13, 2024Observed: 2.36 ft at 11:00PM May 13, 2024Observed: 2.3 ft at 11:15PM May 13, 2024Observed: 2.25 ft at 11:30PM May 13, 2024Observed: 2.2 ft at 11:45PM May 13, 2024Observed: 2.15 ft at 12:00AM May 14, 2024Observed: 2.1 ft at 12:15AM May 14, 2024Observed: 2.07 ft at 12:30AM May 14, 2024Observed: 2.04 ft at 12:45AM May 14, 2024Observed: 2.02 ft at 1:00AM May 14, 2024Observed: 2 ft at 1:15AM May 14, 2024Observed: 2.01 ft at 1:30AM May 14, 2024Observed: 2.03 ft at 1:45AM May 14, 2024Observed: 2.08 ft at 2:00AM May 14, 2024Observed: 2.14 ft at 2:15AM May 14, 2024Observed: 2.23 ft at 2:30AM May 14, 2024Observed: 2.34 ft at 2:45AM May 14, 2024Observed: 2.47 ft at 3:00AM May 14, 2024Observed: 2.6 ft at 3:15AM May 14, 2024Observed: 2.74 ft at 3:30AM May 14, 2024Observed: 2.88 ft at 3:45AM May 14, 2024Observed: 3.01 ft at 4:00AM May 14, 2024Observed: 3.13 ft at 4:15AM May 14, 2024Observed: 3.24 ft at 4:30AM May 14, 2024Observed: 3.33 ft at 4:45AM May 14, 2024Highest Forecast: 3.4 ft 6:00AM May 14, 2024Forecast: 3.2 ft 7:00AM May 14, 2024Forecast: 3 ft 8:00AM May 14, 2024Forecast: 2.7 ft 9:00AM May 14, 2024Forecast: 2.4 ft 10:00AM May 14, 2024Forecast: 2.1 ft 11:00AM May 14, 2024Forecast: 1.9 ft 12:00PM May 14, 2024Forecast: 1.8 ft 1:00PM May 14, 2024Forecast: 1.8 ft 2:00PM May 14, 2024Forecast: 2.1 ft 3:00PM May 14, 2024Forecast: 2.5 ft 4:00PM May 14, 2024Forecast: 3 ft 5:00PM May 14, 2024Forecast: 3.2 ft 6:00PM May 14, 2024Forecast: 3.3 ft 7:00PM May 14, 2024Forecast: 3.1 ft 8:00PM May 14, 2024Forecast: 2.9 ft 9:00PM May 14, 2024Forecast: 2.6 ft 10:00PM May 14, 2024Forecast: 2.2 ft 11:00PM May 14, 2024Forecast: 1.9 ft 12:00AM May 15, 2024Forecast: 1.7 ft 1:00AM May 15, 2024Forecast: 1.7 ft 2:00AM May 15, 2024Forecast: 1.7 ft 3:00AM May 15, 2024Forecast: 1.9 ft 4:00AM May 15, 2024Forecast: 2.1 ft 5:00AM May 15, 2024Forecast: 2.4 ft 6:00AM May 15, 2024Forecast: 2.5 ft 7:00AM May 15, 2024Forecast: 2.4 ft 8:00AM May 15, 2024Forecast: 2.3 ft 9:00AM May 15, 2024Forecast: 2.1 ft 10:00AM May 15, 2024Forecast: 1.9 ft 11:00AM May 15, 2024Forecast: 1.7 ft 12:00PM May 15, 2024Forecast: 1.5 ft 1:00PM May 15, 2024Forecast: 1.3 ft 2:00PM May 15, 2024Forecast: 1.4 ft 3:00PM May 15, 2024Forecast: 1.6 ft 4:00PM May 15, 2024Forecast: 2 ft 5:00PM May 15, 2024Forecast: 2.3 ft 6:00PM May 15, 2024Forecast: 2.5 ft 7:00PM May 15, 2024Forecast: 2.5 ft 8:00PM May 15, 2024Forecast: 2.4 ft 9:00PM May 15, 2024Forecast: 2.2 ft 10:00PM May 15, 2024Forecast: 2 ft 11:00PM May 15, 2024Forecast: 1.8 ft 12:00AM May 16, 2024Forecast: 1.6 ft 1:00AM May 16, 2024Forecast: 1.5 ft 2:00AM May 16, 2024Forecast: 1.6 ft 3:00AM May 16, 2024Forecast: 1.8 ft 4:00AM May 16, 2024Forecast: 2.1 ft 5:00AM May 16, 2024Forecast: 2.4 ft 6:00AM May 16, 2024Forecast: 2.8 ft 7:00AM May 16, 2024Forecast: 3 ft 8:00AM May 16, 2024USGS--Water Resources of the United StatesMHDC3(plotting HGIRZ) Graph Created (5:45AM May 14, 2024)ObservedForecast (issued 10:59AM May 13)Latest observed value: 3.33 ft at 4:45 AM EDT 14-May-2024. Flood Stage is 7 ft
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About this graph
Tabular Data (UTC)
Tabular Data (EDT)
XML Data
RSS Files
Datum: NGVD29
Metadata
NOTE: Gauge reading affected by ocean tides.

Reliability of the Forecast: Based on current and forecast river, weather and reservoir conditions

NOTE: Forecasts for the Connecticut River at Middle Haddam are issued routinely year-round.

Return to Area Map
Upstream Gauge - at Hartford Upstream Gauge
Flood Categories (in feet)
Major Flood Stage: 13
Moderate Flood Stage: 10.5
Flood Stage: 7
Action Stage: 5
Low Stage (in feet): -9999

Historic Crests
(1) 11.20 ft on 12/21/2023
(2) 10.41 ft on 07/13/2023
(3) 9.98 ft on 03/10/2024
(4) 9.39 ft on 04/17/2014
(5) 8.85 ft on 02/28/2016
(6) 8.48 ft on 12/28/2020
(7) 8.33 ft on 03/14/2011
(8) 8.22 ft on 01/13/2024
(9) 8.15 ft on 05/02/2011
(10) 8.07 ft on 03/22/2011
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 7.44 ft on 03/14/2024
(2) 9.98 ft on 03/10/2024
(3) 8.22 ft on 01/13/2024
(4) 11.20 ft on 12/21/2023
(5) 7.15 ft on 12/18/2023
(6) 10.41 ft on 07/13/2023
(7) 7.53 ft on 05/04/2023
(8) 7.41 ft on 07/20/2021
(9) 8.48 ft on 12/28/2020
(10) 7.36 ft on 04/16/2020
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.
Zoom Level:15
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 This is a serious and life threatening flood episode. Follow the direction of your local emergency management officals. If asked to evacuate, do so immediately. All flood protection measures must be rushed to completion in flood prone areas. Widespread inundation is likely from Middletown and Portland downstream through Chester, Old Lyme and Old Saybrook.
16.5 This is a serious and potentially life threatening flood episode. Follow the direction of your local emergency management officals. If asked to evacuate, do so immediately. All flood protection measures must be rushed to completion in flood prone areas.
15 Significant flooding will continue to impact low lying homes and businesses along the river from Wethersfield south through Middle Haddam, downstream to the mouth of the river in Old Saybrook. A portion of Route 9 will flood near the Middletown Portland railroad bridge. Follow the directions of your local emergency management officals.
13 Major river flooding will impact towns along the Connecticut River from Middletown and Portland downstream through Chester and Essex. Many roads near the river will be flooded. Some localized evacuations may be needed. Follow the directions of your local emergency management official. Know alternate routes for travel should roads in your area become flooded.
11.5 Flooding will likely result in the evacuation of low lying areas along River Road in Cromwell and Meadow Road in Portland. Flooding will occur in the Harbor Park area. Flooding increases in surrounding towns along the river, from Middletown and Portland to the river mouth at Old Saybrook.
10.5 Flooding continues to overspread sections of Portland and Middletown, as well as downstream towns including Chester and Essex. Some immediate river roads will be impassable. In Cromwell this usually impacts portions of River Road. In Rocky Hill, portions of Meadow Road will become impassable.
9.5 Flooding closes most of Meadow Road, Route 17A, in the Gildersleeve section of Portland. Flooding impacts the Middletown Marina and Meadow Farms. In Cromwell, portions of River Road will be closed. In Rocky Hill, parts of Meadow Road will be impassable for a time. Flooding continues along the river southward through Essex.
8 Flooding is expected in low lying sections along the Connecticut River from Wethersfield and Glastonbury downstream through Cromwell, Middletown and Portland. Boating interests should prepare for a period of swift river flows.
7 Flooding is likely in the vicinity of Meadow Road, Route 17A, in the Gildersleeve section of Portland. A portion of this roadway will likely be closed. This includes the Exchange Club of Portland Fairgrounds. Boating interests should prepare for a period of swift river flows during this period.
About This Location Collapse

Latitude: 41.541766° N, Longitude: 72.553145° W, Horizontal Datum: NAD27

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft 7 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)		 Elevation
(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 0.00 7.00 Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other Not Available Not Available  

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.

River stage data collection for this gage began in September 2010.
Resources Collapse
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
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Norton, MA 02766
(508) 622-3250
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