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Web Portal Changes: The Advanced Hydrologic Prediction Service (AHPS) hosted at https://water.weather.gov 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 https://www.weather.gov/owp/operations for more information.

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DID YOU KNOW... Please try our new TEST hydrograph page link at: https://preview.water.noaa.gov/gauges/abcde - 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 water.noaa.gov.  Feedback can be provided HERE
Hydrograph River at a Glance Download
Willimantic River at Coventry Stage (ft)Flow (kcfs)Observed: 3.49 ft at 3:15AM Dec 02, 2023Observed: 3.49 ft at 3:30AM Dec 02, 2023Observed: 3.5 ft at 3:45AM Dec 02, 2023Observed: 3.5 ft at 4:00AM Dec 02, 2023Observed: 3.5 ft at 4:15AM Dec 02, 2023Observed: 3.5 ft at 4:30AM Dec 02, 2023Observed: 3.5 ft at 4:45AM Dec 02, 2023Observed: 3.5 ft at 5:00AM Dec 02, 2023Observed: 3.5 ft at 5:15AM Dec 02, 2023Observed: 3.51 ft at 5:30AM Dec 02, 2023Observed: 3.5 ft at 5:45AM Dec 02, 2023Observed: 3.51 ft at 6:00AM Dec 02, 2023Observed: 3.51 ft at 6:15AM Dec 02, 2023Observed: 3.51 ft at 6:30AM Dec 02, 2023Observed: 3.51 ft at 6:45AM Dec 02, 2023Observed: 3.51 ft at 7:00AM Dec 02, 2023Observed: 3.51 ft at 7:15AM Dec 02, 2023Observed: 3.51 ft at 7:30AM Dec 02, 2023Observed: 3.52 ft at 7:45AM Dec 02, 2023Observed: 3.52 ft at 8:00AM Dec 02, 2023Observed: 3.52 ft at 8:15AM Dec 02, 2023Observed: 3.51 ft at 8:30AM Dec 02, 2023Observed: 3.52 ft at 8:45AM Dec 02, 2023Observed: 3.52 ft at 9:00AM Dec 02, 2023Observed: 3.52 ft at 9:15AM Dec 02, 2023Observed: 3.52 ft at 9:30AM Dec 02, 2023Observed: 3.52 ft at 9:45AM Dec 02, 2023Observed: 3.52 ft at 10:00AM Dec 02, 2023Observed: 3.52 ft at 10:15AM Dec 02, 2023Observed: 3.52 ft at 10:30AM Dec 02, 2023Observed: 3.52 ft at 10:45AM Dec 02, 2023Observed: 3.52 ft at 11:00AM Dec 02, 2023Observed: 3.52 ft at 11:15AM Dec 02, 2023Observed: 3.52 ft at 11:30AM Dec 02, 2023Observed: 3.52 ft at 11:45AM Dec 02, 2023Observed: 3.52 ft at 12:00PM Dec 02, 2023Observed: 3.52 ft at 12:15PM Dec 02, 2023Observed: 3.53 ft at 12:30PM Dec 02, 2023Observed: 3.53 ft at 12:45PM Dec 02, 2023Observed: 3.53 ft at 1:00PM Dec 02, 2023Observed: 3.53 ft at 1:15PM Dec 02, 2023Observed: 3.52 ft at 1:30PM Dec 02, 2023Observed: 3.53 ft at 1:45PM Dec 02, 2023Observed: 3.53 ft at 2:00PM Dec 02, 2023Observed: 3.53 ft at 2:15PM Dec 02, 2023Observed: 3.52 ft at 2:30PM Dec 02, 2023Observed: 3.53 ft at 2:45PM Dec 02, 2023Observed: 3.52 ft at 3:00PM Dec 02, 2023Observed: 3.53 ft at 3:15PM Dec 02, 2023Observed: 3.52 ft at 3:30PM Dec 02, 2023Observed: 3.52 ft at 3:45PM Dec 02, 2023Observed: 3.52 ft at 4:00PM Dec 02, 2023Observed: 3.52 ft at 4:15PM Dec 02, 2023Observed: 3.52 ft at 4:30PM Dec 02, 2023Observed: 3.52 ft at 4:45PM Dec 02, 2023Observed: 3.52 ft at 5:00PM Dec 02, 2023Observed: 3.52 ft at 5:15PM Dec 02, 2023Observed: 3.52 ft at 5:30PM Dec 02, 2023Observed: 3.52 ft at 5:45PM Dec 02, 2023Observed: 3.52 ft at 6:00PM Dec 02, 2023Observed: 3.52 ft at 6:15PM Dec 02, 2023Observed: 3.52 ft at 6:30PM Dec 02, 2023Observed: 3.52 ft at 6:45PM Dec 02, 2023Observed: 3.52 ft at 7:00PM Dec 02, 2023Observed: 3.52 ft at 7:15PM Dec 02, 2023Observed: 3.52 ft at 7:30PM Dec 02, 2023Observed: 3.51 ft at 7:45PM Dec 02, 2023Observed: 3.52 ft at 8:00PM Dec 02, 2023Observed: 3.52 ft at 8:15PM Dec 02, 2023Observed: 3.52 ft at 8:30PM Dec 02, 2023Observed: 3.52 ft at 8:45PM Dec 02, 2023Observed: 3.51 ft at 9:00PM Dec 02, 2023Observed: 3.51 ft at 9:15PM Dec 02, 2023Observed: 3.52 ft at 9:30PM Dec 02, 2023Observed: 3.51 ft at 9:45PM Dec 02, 2023Observed: 3.52 ft at 10:00PM Dec 02, 2023Observed: 3.51 ft at 10:15PM Dec 02, 2023Observed: 3.51 ft at 10:30PM Dec 02, 2023Observed: 3.52 ft at 10:45PM Dec 02, 2023Observed: 3.52 ft at 11:00PM Dec 02, 2023Observed: 3.51 ft at 11:15PM Dec 02, 2023Observed: 3.51 ft at 11:30PM Dec 02, 2023Observed: 3.51 ft at 11:45PM Dec 02, 2023Observed: 3.51 ft at 12:00AM Dec 03, 2023Observed: 3.51 ft at 12:15AM Dec 03, 2023Observed: 3.52 ft at 12:30AM Dec 03, 2023Observed: 3.52 ft at 12:45AM Dec 03, 2023Observed: 3.51 ft at 1:00AM Dec 03, 2023Observed: 3.52 ft at 1:15AM Dec 03, 2023Observed: 3.51 ft at 1:30AM Dec 03, 2023Observed: 3.51 ft at 1:45AM Dec 03, 2023Observed: 3.51 ft at 2:00AM Dec 03, 2023Observed: 3.51 ft at 2:15AM Dec 03, 2023Observed: 3.51 ft at 2:30AM Dec 03, 2023Observed: 3.52 ft at 2:45AM Dec 03, 2023Observed: 3.51 ft at 3:00AM Dec 03, 2023Observed: 3.51 ft at 3:15AM Dec 03, 2023Observed: 3.51 ft at 3:30AM Dec 03, 2023Observed: 3.51 ft at 3:45AM Dec 03, 2023Observed: 3.51 ft at 4:00AM Dec 03, 2023Observed: 3.51 ft at 4:15AM Dec 03, 2023Observed: 3.52 ft at 4:30AM Dec 03, 2023Observed: 3.52 ft at 4:45AM Dec 03, 2023Observed: 3.51 ft at 5:00AM Dec 03, 2023Observed: 3.52 ft at 5:15AM Dec 03, 2023Observed: 3.51 ft at 5:30AM Dec 03, 2023Observed: 3.51 ft at 5:45AM Dec 03, 2023Observed: 3.52 ft at 6:00AM Dec 03, 2023Observed: 3.51 ft at 6:15AM Dec 03, 2023Observed: 3.52 ft at 6:30AM Dec 03, 2023Observed: 3.52 ft at 6:45AM Dec 03, 2023Observed: 3.52 ft at 7:00AM Dec 03, 2023Observed: 3.52 ft at 7:15AM Dec 03, 2023Observed: 3.52 ft at 7:30AM Dec 03, 2023Observed: 3.53 ft at 7:45AM Dec 03, 2023Observed: 3.53 ft at 8:00AM Dec 03, 2023Observed: 3.53 ft at 8:15AM Dec 03, 2023Observed: 3.53 ft at 8:30AM Dec 03, 2023Observed: 3.53 ft at 8:45AM Dec 03, 2023Observed: 3.53 ft at 9:00AM Dec 03, 2023Observed: 3.54 ft at 9:15AM Dec 03, 2023Observed: 3.54 ft at 9:30AM Dec 03, 2023Observed: 3.54 ft at 9:45AM Dec 03, 2023Observed: 3.55 ft at 10:00AM Dec 03, 2023Observed: 3.55 ft at 10:15AM Dec 03, 2023Observed: 3.55 ft at 10:30AM Dec 03, 2023Observed: 3.55 ft at 10:45AM Dec 03, 2023Observed: 3.56 ft at 11:00AM Dec 03, 2023Observed: 3.57 ft at 11:15AM Dec 03, 2023Observed: 3.57 ft at 11:30AM Dec 03, 2023Observed: 3.57 ft at 11:45AM Dec 03, 2023Observed: 3.58 ft at 12:00PM Dec 03, 2023Observed: 3.59 ft at 12:15PM Dec 03, 2023Observed: 3.58 ft at 12:30PM Dec 03, 2023Observed: 3.59 ft at 12:45PM Dec 03, 2023Observed: 3.6 ft at 1:00PM Dec 03, 2023Observed: 3.61 ft at 1:15PM Dec 03, 2023Observed: 3.62 ft at 1:30PM Dec 03, 2023Observed: 3.63 ft at 1:45PM Dec 03, 2023Observed: 3.64 ft at 2:00PM Dec 03, 2023Observed: 3.65 ft at 2:15PM Dec 03, 2023Observed: 3.66 ft at 2:30PM Dec 03, 2023Observed: 3.66 ft at 2:45PM Dec 03, 2023Observed: 3.67 ft at 3:00PM Dec 03, 2023Observed: 3.68 ft at 3:15PM Dec 03, 2023Observed: 3.69 ft at 3:30PM Dec 03, 2023Observed: 3.7 ft at 3:45PM Dec 03, 2023Observed: 3.72 ft at 4:00PM Dec 03, 2023Observed: 3.72 ft at 4:15PM Dec 03, 2023Observed: 3.78 ft at 5:30PM Dec 03, 2023Observed: 3.79 ft at 5:45PM Dec 03, 2023Observed: 3.8 ft at 6:00PM Dec 03, 2023Observed: 3.81 ft at 6:15PM Dec 03, 2023Observed: 3.82 ft at 6:30PM Dec 03, 2023Observed: 3.84 ft at 6:45PM Dec 03, 2023Observed: 3.85 ft at 7:00PM Dec 03, 2023Observed: 3.86 ft at 7:15PM Dec 03, 2023Observed: 3.88 ft at 7:30PM Dec 03, 2023Observed: 3.88 ft at 7:45PM Dec 03, 2023Observed: 3.88 ft at 7:46PM Dec 03, 2023Observed: 3.89 ft at 8:00PM Dec 03, 2023Observed: 3.9 ft at 8:15PM Dec 03, 2023Observed: 3.9 ft at 8:30PM Dec 03, 2023Observed: 3.91 ft at 8:45PM Dec 03, 2023Observed: 3.91 ft at 9:00PM Dec 03, 2023Observed: 3.93 ft at 9:15PM Dec 03, 2023Observed: 3.93 ft at 9:30PM Dec 03, 2023Observed: 3.94 ft at 9:45PM Dec 03, 2023Observed: 3.95 ft at 10:00PM Dec 03, 2023Observed: 3.95 ft at 10:15PM Dec 03, 2023Observed: 3.96 ft at 10:30PM Dec 03, 2023Observed: 3.96 ft at 10:45PM Dec 03, 2023Observed: 3.97 ft at 11:00PM Dec 03, 2023Observed: 3.98 ft at 11:15PM Dec 03, 2023Observed: 3.98 ft at 11:30PM Dec 03, 2023Observed: 3.99 ft at 11:45PM Dec 03, 2023Observed: 3.99 ft at 12:00AM Dec 04, 2023Observed: 4 ft at 12:15AM Dec 04, 2023Observed: 4 ft at 12:30AM Dec 04, 2023Observed: 4.01 ft at 12:45AM Dec 04, 2023Observed: 4.01 ft at 1:00AM Dec 04, 2023Observed: 4.02 ft at 1:15AM Dec 04, 2023Observed: 4.02 ft at 1:30AM Dec 04, 2023Observed: 4.03 ft at 1:45AM Dec 04, 2023Observed: 4.03 ft at 2:00AM Dec 04, 2023Observed: 4.03 ft at 2:15AM Dec 04, 2023Observed: 4.03 ft at 2:30AM Dec 04, 2023Observed: 4.04 ft at 2:45AM Dec 04, 2023Observed: 4.04 ft at 3:00AM Dec 04, 2023Observed: 4.05 ft at 3:15AM Dec 04, 2023Observed: 4.06 ft at 3:30AM Dec 04, 2023Observed: 4.05 ft at 3:45AM Dec 04, 2023Observed: 4.05 ft at 4:00AM Dec 04, 2023Observed: 4.07 ft at 4:15AM Dec 04, 2023Observed: 4.07 ft at 4:30AM Dec 04, 2023Observed: 4.07 ft at 4:45AM Dec 04, 2023Observed: 4.07 ft at 5:00AM Dec 04, 2023Observed: 4.08 ft at 5:15AM Dec 04, 2023Observed: 4.08 ft at 5:30AM Dec 04, 2023Observed: 4.08 ft at 5:45AM Dec 04, 2023Observed: 4.08 ft at 6:00AM Dec 04, 2023Observed: 4.08 ft at 6:15AM Dec 04, 2023Observed: 4.09 ft at 6:30AM Dec 04, 2023Observed: 4.08 ft at 6:45AM Dec 04, 2023Observed: 4.09 ft at 7:00AM Dec 04, 2023Observed: 4.09 ft at 7:15AM Dec 04, 2023Observed: 4.09 ft at 7:30AM Dec 04, 2023Observed: 4.09 ft at 7:45AM Dec 04, 2023Highest Observation: 4.1 ft at 8:00AM Dec 04, 2023Observed: 4.09 ft at 8:15AM Dec 04, 2023Highest Observation: 4.1 ft at 8:30AM Dec 04, 2023Highest Observation: 4.1 ft at 8:45AM Dec 04, 2023Highest Observation: 4.1 ft at 9:00AM Dec 04, 2023Highest Observation: 4.1 ft at 9:15AM Dec 04, 2023Highest Observation: 4.1 ft at 9:30AM Dec 04, 2023Highest Observation: 4.1 ft at 9:45AM Dec 04, 2023Highest Observation: 4.1 ft at 10:00AM Dec 04, 2023Highest Observation: 4.1 ft at 10:15AM Dec 04, 2023Highest Observation: 4.1 ft at 10:30AM Dec 04, 2023Highest Observation: 4.1 ft at 10:45AM Dec 04, 2023Highest Observation: 4.1 ft at 11:00AM Dec 04, 2023Highest Observation: 4.1 ft at 11:15AM Dec 04, 2023Highest Observation: 4.1 ft at 11:30AM Dec 04, 2023Observed: 4.09 ft at 11:45AM Dec 04, 2023Highest Observation: 4.1 ft at 12:00PM Dec 04, 2023Observed: 4.09 ft at 12:15PM Dec 04, 2023Highest Observation: 4.1 ft at 12:30PM Dec 04, 2023Observed: 4.09 ft at 12:45PM Dec 04, 2023Observed: 4.09 ft at 1:00PM Dec 04, 2023Highest Observation: 4.1 ft at 1:15PM Dec 04, 2023Observed: 4.09 ft at 1:30PM Dec 04, 2023Observed: 4.09 ft at 1:45PM Dec 04, 2023Observed: 4.08 ft at 2:00PM Dec 04, 2023Observed: 4.08 ft at 2:15PM Dec 04, 2023Observed: 4.09 ft at 2:30PM Dec 04, 2023Observed: 4.09 ft at 2:45PM Dec 04, 2023Observed: 4.08 ft at 3:00PM Dec 04, 2023Observed: 4.08 ft at 3:15PM Dec 04, 2023Observed: 4.07 ft at 3:30PM Dec 04, 2023Observed: 4.08 ft at 3:45PM Dec 04, 2023Observed: 4.08 ft at 4:00PM Dec 04, 2023Observed: 4.07 ft at 4:15PM Dec 04, 2023Observed: 4.06 ft at 4:30PM Dec 04, 2023Observed: 4.06 ft at 4:45PM Dec 04, 2023Observed: 4.07 ft at 5:00PM Dec 04, 2023Observed: 4.06 ft at 5:15PM Dec 04, 2023Observed: 4.06 ft at 5:30PM Dec 04, 2023Observed: 4.06 ft at 5:45PM Dec 04, 2023Observed: 4.06 ft at 6:00PM Dec 04, 2023Observed: 4.05 ft at 6:15PM Dec 04, 2023Observed: 4.06 ft at 6:30PM Dec 04, 2023Observed: 4.05 ft at 6:45PM Dec 04, 2023Observed: 4.05 ft at 7:00PM Dec 04, 2023Observed: 4.05 ft at 7:15PM Dec 04, 2023Observed: 4.04 ft at 7:30PM Dec 04, 2023Observed: 4.05 ft at 7:45PM Dec 04, 2023Observed: 4.04 ft at 8:00PM Dec 04, 2023Observed: 4.03 ft at 8:15PM Dec 04, 2023Observed: 4.04 ft at 8:30PM Dec 04, 2023Observed: 4.03 ft at 8:45PM Dec 04, 2023Observed: 4.04 ft at 9:00PM Dec 04, 2023Observed: 4.04 ft at 9:15PM Dec 04, 2023Observed: 4.03 ft at 9:30PM Dec 04, 2023Observed: 4.02 ft at 9:45PM Dec 04, 2023Observed: 4.03 ft at 10:00PM Dec 04, 2023Observed: 4.03 ft at 10:15PM Dec 04, 2023Observed: 4.02 ft at 10:30PM Dec 04, 2023Observed: 4.01 ft at 10:45PM Dec 04, 2023Observed: 4.02 ft at 11:00PM Dec 04, 2023Observed: 4.01 ft at 11:15PM Dec 04, 2023Observed: 4 ft at 11:30PM Dec 04, 2023Observed: 4 ft at 11:45PM Dec 04, 2023Observed: 4 ft at 12:00AM Dec 05, 2023Observed: 3.99 ft at 12:15AM Dec 05, 2023Observed: 3.99 ft at 12:30AM Dec 05, 2023Observed: 3.99 ft at 12:45AM Dec 05, 2023Observed: 3.99 ft at 1:00AM Dec 05, 2023Observed: 3.99 ft at 1:15AM Dec 05, 2023Observed: 4 ft at 1:30AM Dec 05, 2023Observed: 3.99 ft at 1:45AM Dec 05, 2023Observed: 3.99 ft at 2:00AM Dec 05, 2023Observed: 3.99 ft at 2:15AM Dec 05, 2023USGS--Water Resources of the United StatesCVTC3(plotting HGIRG) Graph Created (3:00AM Dec 5, 2023)ObservedLatest observed value: 3.99 ft at 2:15 AM EST 5-Dec-2023. Flood Stage is 8 ft
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About this graph
Tabular Data (UTC)
Tabular Data (EST)
XML Data
RSS Files
Datum: NGVD29
Metadata
NOTE: Forecasts are not available for the Willimantic River at Coventry. Only observed stages are available for this point.
Return to Area Map
Flood Categories (in feet)
Major Flood Stage: 14
Moderate Flood Stage: 11
Flood Stage: 8
Action Stage: 7
Low Stage (in feet): -9999

Historic Crests
(1) 18.66 ft on 08/19/1955
(2) 18.08 ft on 09/21/1938
(3) 14.81 ft on 10/15/2005
(4) 12.19 ft on 03/12/1936
(5) 11.64 ft on 06/05/1982
(6) 11.28 ft on 07/10/2021 (P)
(7) 11.12 ft on 03/07/2011
(8) 10.94 ft on 05/31/1984
(9) 10.91 ft on 01/25/1979
(10) 10.83 ft on 01/26/1978
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 10.47 ft on 09/02/2021 (P)
(2) 9.75 ft on 07/18/2021 (P)
(3) 11.28 ft on 07/10/2021 (P)
(4) 9.00 ft on 12/26/2020 (P)
(5) 8.15 ft on 04/27/2019
(6) 9.23 ft on 01/25/2019
(7) 8.19 ft on 09/26/2018
(8) 8.41 ft on 04/17/2018
(9) 8.75 ft on 01/13/2018
(10) 8.11 ft on 10/30/2017
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.
Zoom Level:16
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
14.5 Numerous roads are impacted in Coventry and Mansfield. This includes the following, Thornbush Road, Route 275, Depot Road, Cider Mill and Flanders River Roads, and Route 44 near the Mansfield/Coventry town line.
13.5 Floodwaters reaach base of Merrow Road Bridge.
10.5 Floodwaters inundate meadow Merrow Park near bridge.
8 Floodwaters reach the lowest lying sections of Thornbush and Flanders River Roads in Mansfield and Coventry.
About This Location Collapse

Latitude: 41.750654° N, Longitude: 72.265635° W, Horizontal Datum: NAD27

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft 8 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 29 239.05 247.05 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:
Resources Collapse
Hydrologic Resources Additional Resources
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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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