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Hydrograph River at a Glance Download
Squannacook River at West Groton Stage (ft)Flow (kcfs)Observed: 4.94 ft at 12:15AM Apr 13, 2024Observed: 5 ft at 12:30AM Apr 13, 2024Observed: 5 ft at 12:45AM Apr 13, 2024Observed: 5.03 ft at 1:00AM Apr 13, 2024Observed: 5 ft at 1:15AM Apr 13, 2024Observed: 5.07 ft at 1:30AM Apr 13, 2024Observed: 5.04 ft at 1:45AM Apr 13, 2024Observed: 5.11 ft at 2:00AM Apr 13, 2024Observed: 5.1 ft at 2:15AM Apr 13, 2024Observed: 5.09 ft at 2:30AM Apr 13, 2024Observed: 5.15 ft at 2:45AM Apr 13, 2024Observed: 5.1 ft at 3:00AM Apr 13, 2024Observed: 5.22 ft at 3:15AM Apr 13, 2024Observed: 5.18 ft at 3:30AM Apr 13, 2024Observed: 5.14 ft at 3:45AM Apr 13, 2024Observed: 5.19 ft at 4:00AM Apr 13, 2024Observed: 5.19 ft at 4:15AM Apr 13, 2024Observed: 5.22 ft at 4:30AM Apr 13, 2024Observed: 5.19 ft at 4:45AM Apr 13, 2024Observed: 5.2 ft at 5:00AM Apr 13, 2024Highest Observation: 5.26 ft at 5:15AM Apr 13, 2024Observed: 5.22 ft at 5:30AM Apr 13, 2024Observed: 5.22 ft at 5:45AM Apr 13, 2024Observed: 5.22 ft at 6:00AM Apr 13, 2024Observed: 5.17 ft at 6:15AM Apr 13, 2024Observed: 5.14 ft at 6:30AM Apr 13, 2024Observed: 5.19 ft at 6:45AM Apr 13, 2024Observed: 5.21 ft at 7:00AM Apr 13, 2024Observed: 5.2 ft at 7:15AM Apr 13, 2024Observed: 5.19 ft at 7:30AM Apr 13, 2024Observed: 5.2 ft at 7:45AM Apr 13, 2024Observed: 5.17 ft at 8:00AM Apr 13, 2024Observed: 5.16 ft at 8:15AM Apr 13, 2024Observed: 5.19 ft at 8:30AM Apr 13, 2024Observed: 5.16 ft at 8:45AM Apr 13, 2024Observed: 5.18 ft at 9:00AM Apr 13, 2024Observed: 5.14 ft at 9:15AM Apr 13, 2024Observed: 5.14 ft at 9:30AM Apr 13, 2024Observed: 5.13 ft at 9:45AM Apr 13, 2024Observed: 5.1 ft at 10:00AM Apr 13, 2024Observed: 5.17 ft at 10:15AM Apr 13, 2024Observed: 5.11 ft at 10:30AM Apr 13, 2024Observed: 5.1 ft at 10:45AM Apr 13, 2024Observed: 5.09 ft at 11:00AM Apr 13, 2024Observed: 5.09 ft at 11:15AM Apr 13, 2024Observed: 4.98 ft at 11:30AM Apr 13, 2024Observed: 5.08 ft at 11:45AM Apr 13, 2024Observed: 5 ft at 12:00PM Apr 13, 2024Observed: 4.99 ft at 12:15PM Apr 13, 2024Observed: 4.97 ft at 12:30PM Apr 13, 2024Observed: 5.02 ft at 12:45PM Apr 13, 2024Observed: 5.02 ft at 1:00PM Apr 13, 2024Observed: 4.97 ft at 1:15PM Apr 13, 2024Observed: 5.01 ft at 1:30PM Apr 13, 2024Observed: 4.94 ft at 1:45PM Apr 13, 2024Observed: 4.96 ft at 2:00PM Apr 13, 2024Observed: 4.94 ft at 2:15PM Apr 13, 2024Observed: 4.95 ft at 2:30PM Apr 13, 2024Observed: 4.93 ft at 2:45PM Apr 13, 2024Observed: 4.9 ft at 3:00PM Apr 13, 2024Observed: 4.9 ft at 3:15PM Apr 13, 2024Observed: 4.87 ft at 3:30PM Apr 13, 2024Observed: 4.82 ft at 3:45PM Apr 13, 2024Observed: 4.81 ft at 4:00PM Apr 13, 2024Observed: 4.86 ft at 4:15PM Apr 13, 2024Observed: 4.86 ft at 4:30PM Apr 13, 2024Observed: 4.86 ft at 4:45PM Apr 13, 2024Observed: 4.8 ft at 5:00PM Apr 13, 2024Observed: 4.75 ft at 5:15PM Apr 13, 2024Observed: 4.78 ft at 5:30PM Apr 13, 2024Observed: 4.81 ft at 5:45PM Apr 13, 2024Observed: 4.72 ft at 6:00PM Apr 13, 2024Observed: 4.74 ft at 6:15PM Apr 13, 2024Observed: 4.79 ft at 6:30PM Apr 13, 2024Observed: 4.76 ft at 6:45PM Apr 13, 2024Observed: 4.71 ft at 7:00PM Apr 13, 2024Observed: 4.69 ft at 7:15PM Apr 13, 2024Observed: 4.69 ft at 7:30PM Apr 13, 2024Observed: 4.65 ft at 7:45PM Apr 13, 2024Observed: 4.67 ft at 8:00PM Apr 13, 2024Observed: 4.64 ft at 8:15PM Apr 13, 2024Observed: 4.62 ft at 8:30PM Apr 13, 2024Observed: 4.6 ft at 8:45PM Apr 13, 2024Observed: 4.67 ft at 9:00PM Apr 13, 2024Observed: 4.64 ft at 9:15PM Apr 13, 2024Observed: 4.63 ft at 9:30PM Apr 13, 2024Observed: 4.64 ft at 9:45PM Apr 13, 2024Observed: 4.61 ft at 10:00PM Apr 13, 2024Observed: 4.59 ft at 10:15PM Apr 13, 2024Observed: 4.58 ft at 10:30PM Apr 13, 2024Observed: 4.57 ft at 10:45PM Apr 13, 2024Observed: 4.54 ft at 11:00PM Apr 13, 2024Observed: 4.56 ft at 11:15PM Apr 13, 2024Observed: 4.52 ft at 11:30PM Apr 13, 2024Observed: 4.55 ft at 11:45PM Apr 13, 2024Observed: 4.52 ft at 12:00AM Apr 14, 2024Observed: 4.55 ft at 12:15AM Apr 14, 2024Observed: 4.49 ft at 12:30AM Apr 14, 2024Observed: 4.5 ft at 12:45AM Apr 14, 2024Observed: 4.52 ft at 1:00AM Apr 14, 2024Observed: 4.51 ft at 1:15AM Apr 14, 2024Observed: 4.48 ft at 1:30AM Apr 14, 2024Observed: 4.48 ft at 1:45AM Apr 14, 2024Observed: 4.45 ft at 2:00AM Apr 14, 2024Observed: 4.45 ft at 2:15AM Apr 14, 2024Observed: 4.46 ft at 2:30AM Apr 14, 2024Observed: 4.41 ft at 2:45AM Apr 14, 2024Observed: 4.43 ft at 3:00AM Apr 14, 2024Observed: 4.43 ft at 3:15AM Apr 14, 2024Observed: 4.41 ft at 3:30AM Apr 14, 2024Observed: 4.39 ft at 3:45AM Apr 14, 2024Observed: 4.4 ft at 4:00AM Apr 14, 2024Observed: 4.38 ft at 4:15AM Apr 14, 2024Observed: 4.34 ft at 4:30AM Apr 14, 2024Observed: 4.37 ft at 4:45AM Apr 14, 2024Observed: 4.35 ft at 5:00AM Apr 14, 2024Observed: 4.34 ft at 5:15AM Apr 14, 2024Observed: 4.32 ft at 5:30AM Apr 14, 2024Observed: 4.36 ft at 5:45AM Apr 14, 2024Observed: 4.34 ft at 6:00AM Apr 14, 2024Observed: 4.31 ft at 6:15AM Apr 14, 2024Observed: 4.29 ft at 6:30AM Apr 14, 2024Observed: 4.3 ft at 6:45AM Apr 14, 2024Observed: 4.32 ft at 7:00AM Apr 14, 2024Observed: 4.27 ft at 7:15AM Apr 14, 2024Observed: 4.31 ft at 7:30AM Apr 14, 2024Observed: 4.29 ft at 7:45AM Apr 14, 2024Observed: 4.28 ft at 8:00AM Apr 14, 2024Observed: 4.28 ft at 8:15AM Apr 14, 2024Observed: 4.23 ft at 8:30AM Apr 14, 2024Observed: 4.25 ft at 8:45AM Apr 14, 2024Observed: 4.26 ft at 9:00AM Apr 14, 2024Observed: 4.24 ft at 9:15AM Apr 14, 2024Observed: 4.24 ft at 9:30AM Apr 14, 2024Observed: 4.25 ft at 9:45AM Apr 14, 2024Observed: 4.19 ft at 10:00AM Apr 14, 2024Observed: 4.21 ft at 10:15AM Apr 14, 2024Observed: 4.23 ft at 10:30AM Apr 14, 2024Observed: 4.16 ft at 10:45AM Apr 14, 2024Observed: 4.21 ft at 11:00AM Apr 14, 2024Observed: 4.2 ft at 11:15AM Apr 14, 2024Observed: 4.18 ft at 11:30AM Apr 14, 2024Observed: 4.16 ft at 11:45AM Apr 14, 2024Observed: 4.19 ft at 12:00PM Apr 14, 2024Observed: 4.15 ft at 12:15PM Apr 14, 2024Observed: 4.2 ft at 12:30PM Apr 14, 2024Observed: 4.18 ft at 12:45PM Apr 14, 2024Observed: 4.18 ft at 1:00PM Apr 14, 2024Observed: 4.15 ft at 1:15PM Apr 14, 2024Observed: 4.14 ft at 1:30PM Apr 14, 2024Observed: 4.14 ft at 1:45PM Apr 14, 2024Observed: 4.14 ft at 2:00PM Apr 14, 2024Observed: 4.14 ft at 2:15PM Apr 14, 2024Observed: 4.15 ft at 2:30PM Apr 14, 2024Observed: 4.09 ft at 2:45PM Apr 14, 2024Observed: 4.14 ft at 3:00PM Apr 14, 2024Observed: 4.1 ft at 3:15PM Apr 14, 2024Observed: 4.08 ft at 3:30PM Apr 14, 2024Observed: 4.07 ft at 3:45PM Apr 14, 2024Observed: 4.1 ft at 4:00PM Apr 14, 2024Observed: 4.1 ft at 4:15PM Apr 14, 2024Observed: 4.09 ft at 4:30PM Apr 14, 2024Observed: 4.1 ft at 4:45PM Apr 14, 2024Observed: 4.06 ft at 5:00PM Apr 14, 2024Observed: 4.04 ft at 5:15PM Apr 14, 2024Observed: 4.07 ft at 5:30PM Apr 14, 2024Observed: 4.06 ft at 5:45PM Apr 14, 2024Observed: 4.04 ft at 6:00PM Apr 14, 2024Observed: 4.06 ft at 6:15PM Apr 14, 2024Observed: 4 ft at 6:30PM Apr 14, 2024Observed: 4.02 ft at 6:45PM Apr 14, 2024Observed: 4.03 ft at 7:00PM Apr 14, 2024Observed: 4.02 ft at 7:15PM Apr 14, 2024Observed: 4.02 ft at 7:30PM Apr 14, 2024Observed: 4.03 ft at 7:45PM Apr 14, 2024Observed: 4.02 ft at 8:00PM Apr 14, 2024Observed: 3.99 ft at 8:15PM Apr 14, 2024Observed: 4.04 ft at 8:30PM Apr 14, 2024Observed: 4.02 ft at 8:45PM Apr 14, 2024Observed: 3.97 ft at 9:00PM Apr 14, 2024Observed: 3.99 ft at 9:15PM Apr 14, 2024Observed: 4 ft at 9:30PM Apr 14, 2024Observed: 4 ft at 9:45PM Apr 14, 2024Observed: 3.97 ft at 10:00PM Apr 14, 2024Observed: 3.97 ft at 10:15PM Apr 14, 2024Observed: 3.97 ft at 10:30PM Apr 14, 2024Observed: 3.97 ft at 10:45PM Apr 14, 2024Observed: 3.99 ft at 11:00PM Apr 14, 2024Observed: 3.96 ft at 11:15PM Apr 14, 2024Observed: 3.97 ft at 11:30PM Apr 14, 2024Observed: 3.98 ft at 11:45PM Apr 14, 2024Observed: 3.97 ft at 12:00AM Apr 15, 2024Observed: 3.96 ft at 12:15AM Apr 15, 2024Observed: 3.94 ft at 12:30AM Apr 15, 2024Observed: 3.95 ft at 12:45AM Apr 15, 2024Observed: 3.97 ft at 1:00AM Apr 15, 2024Observed: 3.94 ft at 1:15AM Apr 15, 2024Observed: 3.96 ft at 1:30AM Apr 15, 2024Observed: 3.94 ft at 1:45AM Apr 15, 2024Observed: 3.94 ft at 2:00AM Apr 15, 2024Observed: 3.93 ft at 2:15AM Apr 15, 2024Observed: 3.92 ft at 2:30AM Apr 15, 2024Observed: 3.91 ft at 2:45AM Apr 15, 2024Observed: 3.91 ft at 3:00AM Apr 15, 2024Observed: 3.92 ft at 3:15AM Apr 15, 2024Observed: 3.91 ft at 3:30AM Apr 15, 2024Observed: 3.92 ft at 3:45AM Apr 15, 2024Observed: 3.9 ft at 4:00AM Apr 15, 2024Observed: 3.89 ft at 4:15AM Apr 15, 2024Observed: 3.89 ft at 4:30AM Apr 15, 2024Observed: 3.9 ft at 4:45AM Apr 15, 2024Observed: 3.89 ft at 5:00AM Apr 15, 2024Observed: 3.87 ft at 5:15AM Apr 15, 2024Observed: 3.88 ft at 5:30AM Apr 15, 2024Observed: 3.88 ft at 5:45AM Apr 15, 2024Observed: 3.84 ft at 6:00AM Apr 15, 2024Observed: 3.88 ft at 6:15AM Apr 15, 2024Observed: 3.87 ft at 6:30AM Apr 15, 2024Observed: 3.86 ft at 6:45AM Apr 15, 2024Observed: 3.85 ft at 7:00AM Apr 15, 2024Observed: 3.86 ft at 7:15AM Apr 15, 2024Observed: 3.86 ft at 7:30AM Apr 15, 2024Observed: 3.85 ft at 7:45AM Apr 15, 2024Observed: 3.85 ft at 8:00AM Apr 15, 2024Observed: 3.85 ft at 8:15AM Apr 15, 2024Observed: 3.83 ft at 8:30AM Apr 15, 2024Observed: 3.86 ft at 8:45AM Apr 15, 2024Observed: 3.85 ft at 9:00AM Apr 15, 2024Observed: 3.86 ft at 9:15AM Apr 15, 2024Observed: 3.85 ft at 9:30AM Apr 15, 2024Observed: 3.84 ft at 9:45AM Apr 15, 2024Observed: 3.83 ft at 10:00AM Apr 15, 2024Observed: 3.83 ft at 10:15AM Apr 15, 2024Observed: 3.83 ft at 10:30AM Apr 15, 2024Observed: 3.83 ft at 10:45AM Apr 15, 2024Observed: 3.83 ft at 11:00AM Apr 15, 2024Observed: 3.81 ft at 11:15AM Apr 15, 2024Observed: 3.82 ft at 11:30AM Apr 15, 2024Observed: 3.81 ft at 11:45AM Apr 15, 2024Observed: 3.8 ft at 12:00PM Apr 15, 2024Observed: 3.82 ft at 12:15PM Apr 15, 2024Observed: 3.8 ft at 12:30PM Apr 15, 2024Observed: 3.81 ft at 12:45PM Apr 15, 2024Observed: 3.8 ft at 1:00PM Apr 15, 2024Observed: 3.82 ft at 1:15PM Apr 15, 2024Observed: 3.81 ft at 1:30PM Apr 15, 2024Observed: 3.79 ft at 1:45PM Apr 15, 2024Observed: 3.8 ft at 2:00PM Apr 15, 2024Observed: 3.8 ft at 2:15PM Apr 15, 2024Observed: 3.81 ft at 2:30PM Apr 15, 2024Observed: 3.79 ft at 2:45PM Apr 15, 2024Observed: 3.8 ft at 3:00PM Apr 15, 2024Observed: 3.79 ft at 3:15PM Apr 15, 2024Observed: 3.78 ft at 3:30PM Apr 15, 2024Observed: 3.78 ft at 3:45PM Apr 15, 2024Observed: 3.78 ft at 4:00PM Apr 15, 2024Observed: 3.78 ft at 4:15PM Apr 15, 2024Observed: 3.78 ft at 4:30PM Apr 15, 2024Observed: 3.77 ft at 4:45PM Apr 15, 2024Observed: 3.78 ft at 5:00PM Apr 15, 2024Observed: 3.76 ft at 5:15PM Apr 15, 2024Observed: 3.78 ft at 5:30PM Apr 15, 2024Observed: 3.76 ft at 5:45PM Apr 15, 2024Observed: 3.74 ft at 6:00PM Apr 15, 2024Observed: 3.76 ft at 6:15PM Apr 15, 2024Observed: 3.76 ft at 6:30PM Apr 15, 2024Observed: 3.75 ft at 6:45PM Apr 15, 2024Observed: 3.74 ft at 7:00PM Apr 15, 2024Observed: 3.74 ft at 7:15PM Apr 15, 2024Observed: 3.75 ft at 7:30PM Apr 15, 2024Observed: 3.74 ft at 7:45PM Apr 15, 2024Observed: 3.73 ft at 8:00PM Apr 15, 2024Observed: 3.74 ft at 8:15PM Apr 15, 2024Observed: 3.72 ft at 8:30PM Apr 15, 2024Observed: 3.71 ft at 8:45PM Apr 15, 2024Observed: 3.72 ft at 9:00PM Apr 15, 2024Observed: 3.71 ft at 9:15PM Apr 15, 2024Observed: 3.72 ft at 9:30PM Apr 15, 2024Observed: 3.71 ft at 9:45PM Apr 15, 2024Observed: 3.7 ft at 10:00PM Apr 15, 2024Observed: 3.71 ft at 10:15PM Apr 15, 2024Observed: 3.71 ft at 10:30PM Apr 15, 2024Observed: 3.7 ft at 10:45PM Apr 15, 2024Observed: 3.7 ft at 11:00PM Apr 15, 2024Highest Forecast: 3.6 ft 2:00AM Apr 16, 2024Forecast: 3.5 ft 8:00AM Apr 16, 2024Forecast: 3.4 ft 2:00PM Apr 16, 2024Forecast: 3.3 ft 8:00PM Apr 16, 2024Forecast: 3.3 ft 2:00AM Apr 17, 2024Forecast: 3.2 ft 8:00AM Apr 17, 2024Forecast: 3.2 ft 2:00PM Apr 17, 2024Forecast: 3.2 ft 8:00PM Apr 17, 2024Forecast: 3.1 ft 2:00AM Apr 18, 2024Forecast: 3.1 ft 8:00AM Apr 18, 2024USGS--Water Resources of the United StatesWGTM3(plotting HGIRG) Graph Created (12:00AM Apr 16, 2024)ObservedForecast (issued 11:29AM Apr 15)Latest observed value: 3.7 ft at 11:00 PM EDT 15-Apr-2024. Flood Stage is 7 ft
Printable Image
About this graph
Tabular Data (UTC)
Tabular Data (EDT)
XML Data
RSS Files
Datum: NAVD88
Metadata
NOTE: Forecasts for the Squannacook River at West Groton are issued routinely year-round.

Vertical datum height estimated by a GPS unit

Return to Area Map
Flood Categories (in feet)
Major Flood Stage: 9.5
Moderate Flood Stage: 8.5
Flood Stage: 7
Action Stage: 6
Low Stage (in feet): -9999

Historic Crests
(1) 8.50 ft on 04/17/2007
(2) 8.16 ft on 04/06/1987
(3) 8.07 ft on 04/02/2004
(4) 8.04 ft on 10/16/1955
(5) 8.03 ft on 03/15/2010
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 6.90 ft on 09/19/2018
(2) 6.15 ft on 03/31/2014
(3) 7.21 ft on 03/08/2011
(4) 7.56 ft on 03/31/2010
(5) 8.03 ft on 03/15/2010
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.

For more information on your flood risk go to www.floodsmart.gov.
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
9 This is a serious flood event. Widespread flooding is expected along the river through Townsend, Shirley and Groton. Small brooks and tributaries trying to flow into the Squannacook will experience flooding as well. Some road closures may be needed. If asked to evacuate, do so immediately. Follow the directions of emergency management officials.
8.5 Flooding will affect portions of Townsend and Groton. Areas along Turnpike and Barker Hill Roads and along Squannacook Terrace should expect flooding. In addition, flooding also occurs on several access roads to the Townsend State Forest.
8 Minor flooding is expected in lower lying sections of Townsend including the farming areas along Turnpike and Barker Hill roads. Flooding may also spread into low lying areas along Squannacook Terrace.
7.5 Minor flooding affects the lowest lying sections of Townsend, including the farmland along Turnpike and Barker Hill roads.
About This Location Collapse

Latitude: 42.634256° N, Longitude: 71.657848° W, Horizontal Datum: NAD83/WGS84

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 243.5 250.5 Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 Not Available Not Available Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other NULL NULL  

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.
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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46 Commerce Way
Norton, MA 02766
(508) 622-3250
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