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Hydrograph River at a Glance Download Weekly Chance of
Exceeding Levels		 Chance of Exceeding Levels
During Entire Period
Squannacook River at West Groton Observed crest: 2.56 ft at 8:30am Feb 07 Observed: 2.52 ft at 10:15pm Feb 6 Observed: 2.52 ft at 10:30pm Feb 6 Observed: 2.52 ft at 10:45pm Feb 6 Observed: 2.52 ft at 11:00pm Feb 6 Observed: 2.52 ft at 11:15pm Feb 6 Observed: 2.52 ft at 11:30pm Feb 6 Observed: 2.52 ft at 11:45pm Feb 6 Observed: 2.52 ft at 12:00am Feb 7 Observed: 2.52 ft at 12:15am Feb 7 Observed: 2.52 ft at 12:30am Feb 7 Observed: 2.52 ft at 12:45am Feb 7 Observed: 2.52 ft at 1:00am Feb 7 Observed: 2.52 ft at 1:15am Feb 7 Observed: 2.52 ft at 1:30am Feb 7 Observed: 2.52 ft at 1:45am Feb 7 Observed: 2.52 ft at 2:00am Feb 7 Observed: 2.51 ft at 2:15am Feb 7 Observed: 2.51 ft at 2:30am Feb 7 Observed: 2.51 ft at 2:45am Feb 7 Observed: 2.51 ft at 3:00am Feb 7 Observed: 2.51 ft at 3:15am Feb 7 Observed: 2.51 ft at 3:30am Feb 7 Observed: 2.51 ft at 3:45am Feb 7 Observed: 2.51 ft at 4:00am Feb 7 Observed: 2.51 ft at 4:15am Feb 7 Observed: 2.51 ft at 4:30am Feb 7 Observed: 2.51 ft at 4:45am Feb 7 Observed: 2.51 ft at 5:00am Feb 7 Observed: 2.51 ft at 5:15am Feb 7 Observed: 2.52 ft at 5:30am Feb 7 Observed: 2.52 ft at 5:45am Feb 7 Observed: 2.52 ft at 6:00am Feb 7 Observed: 2.53 ft at 6:15am Feb 7 Observed: 2.53 ft at 6:30am Feb 7 Observed: 2.53 ft at 6:45am Feb 7 Observed: 2.54 ft at 7:00am Feb 7 Observed: 2.55 ft at 7:15am Feb 7 Observed: 2.55 ft at 7:30am Feb 7 Observed: 2.55 ft at 7:45am Feb 7 Observed: 2.55 ft at 8:00am Feb 7 Observed: 2.55 ft at 8:15am Feb 7 Observed: 2.56 ft at 8:30am Feb 7 Observed: 2.56 ft at 8:45am Feb 7 Observed: 2.56 ft at 9:00am Feb 7 Observed: 2.56 ft at 9:15am Feb 7 Observed: 2.56 ft at 9:30am Feb 7 Observed: 2.56 ft at 9:45am Feb 7 Observed: 2.56 ft at 10:00am Feb 7 Observed: 2.55 ft at 10:15am Feb 7 Observed: 2.53 ft at 10:30am Feb 7 Observed: 2.51 ft at 10:45am Feb 7 Observed: 2.51 ft at 11:00am Feb 7 Observed: 2.5 ft at 11:15am Feb 7 Observed: 2.5 ft at 11:30am Feb 7 Observed: 2.5 ft at 11:45am Feb 7 Observed: 2.51 ft at 12:00pm Feb 7 Observed: 2.51 ft at 12:15pm Feb 7 Observed: 2.51 ft at 12:30pm Feb 7 Observed: 2.5 ft at 12:45pm Feb 7 Observed: 2.49 ft at 1:00pm Feb 7 Observed: 2.48 ft at 1:15pm Feb 7 Observed: 2.47 ft at 1:30pm Feb 7 Observed: 2.47 ft at 1:45pm Feb 7 Observed: 2.47 ft at 2:00pm Feb 7 Observed: 2.46 ft at 2:15pm Feb 7 Observed: 2.46 ft at 2:30pm Feb 7 Observed: 2.46 ft at 2:45pm Feb 7 Observed: 2.46 ft at 3:00pm Feb 7 Observed: 2.46 ft at 3:15pm Feb 7 Observed: 2.46 ft at 3:30pm Feb 7 Observed: 2.46 ft at 3:45pm Feb 7 Observed: 2.46 ft at 4:00pm Feb 7 Observed: 2.46 ft at 4:15pm Feb 7 Observed: 2.47 ft at 4:30pm Feb 7 Observed: 2.47 ft at 4:45pm Feb 7 Observed: 2.47 ft at 5:00pm Feb 7 Observed: 2.47 ft at 5:15pm Feb 7 Observed: 2.48 ft at 5:30pm Feb 7 Observed: 2.49 ft at 5:45pm Feb 7 Observed: 2.49 ft at 6:00pm Feb 7 Observed: 2.49 ft at 6:15pm Feb 7 Observed: 2.49 ft at 6:30pm Feb 7 Observed: 2.49 ft at 6:45pm Feb 7 Observed: 2.49 ft at 6:59pm Feb 7 Observed: 2.49 ft at 7:00pm Feb 7 Observed: 2.5 ft at 7:15pm Feb 7 Observed: 2.5 ft at 7:30pm Feb 7 Observed: 2.5 ft at 7:45pm Feb 7 Observed: 2.5 ft at 8:00pm Feb 7 Observed: 2.5 ft at 8:15pm Feb 7 Observed: 2.5 ft at 8:30pm Feb 7 Observed: 2.5 ft at 8:45pm Feb 7 Observed: 2.5 ft at 9:00pm Feb 7 Observed: 2.5 ft at 9:15pm Feb 7 Observed: 2.49 ft at 9:30pm Feb 7 Observed: 2.49 ft at 9:45pm Feb 7 Observed: 2.49 ft at 10:00pm Feb 7 Observed: 2.49 ft at 10:15pm Feb 7 Observed: 2.49 ft at 10:30pm Feb 7 Observed: 2.49 ft at 10:45pm Feb 7 Observed: 2.49 ft at 11:00pm Feb 7 Observed: 2.49 ft at 11:15pm Feb 7 Observed: 2.49 ft at 11:30pm Feb 7 Observed: 2.49 ft at 11:45pm Feb 7 Observed: 2.49 ft at 12:00am Feb 8 Observed: 2.48 ft at 12:15am Feb 8 Observed: 2.48 ft at 12:30am Feb 8 Observed: 2.48 ft at 12:45am Feb 8 Observed: 2.48 ft at 1:00am Feb 8 Observed: 2.48 ft at 1:15am Feb 8 Observed: 2.48 ft at 1:30am Feb 8 Observed: 2.48 ft at 1:45am Feb 8 Observed: 2.48 ft at 2:00am Feb 8 Observed: 2.48 ft at 2:15am Feb 8 Observed: 2.48 ft at 2:30am Feb 8 Observed: 2.48 ft at 2:45am Feb 8 Observed: 2.48 ft at 3:00am Feb 8 Observed: 2.48 ft at 3:15am Feb 8 Observed: 2.48 ft at 3:30am Feb 8 Observed: 2.48 ft at 3:45am Feb 8 Observed: 2.48 ft at 4:00am Feb 8 Observed: 2.48 ft at 4:15am Feb 8 Observed: 2.48 ft at 4:30am Feb 8 Observed: 2.48 ft at 4:45am Feb 8 Observed: 2.48 ft at 5:00am Feb 8 Observed: 2.48 ft at 5:15am Feb 8 Observed: 2.48 ft at 5:30am Feb 8 Observed: 2.48 ft at 5:45am Feb 8 Observed: 2.48 ft at 6:00am Feb 8 Observed: 2.48 ft at 6:15am Feb 8 Observed: 2.48 ft at 6:30am Feb 8 Observed: 2.48 ft at 6:45am Feb 8 Observed: 2.48 ft at 7:00am Feb 8 Observed: 2.48 ft at 7:15am Feb 8 Observed: 2.48 ft at 7:30am Feb 8 Observed: 2.48 ft at 7:45am Feb 8 Observed: 2.48 ft at 8:00am Feb 8 Observed: 2.48 ft at 8:15am Feb 8 Observed: 2.48 ft at 8:30am Feb 8 Observed: 2.48 ft at 8:45am Feb 8 Observed: 2.47 ft at 9:00am Feb 8 Observed: 2.47 ft at 9:15am Feb 8 Observed: 2.47 ft at 9:30am Feb 8 Observed: 2.47 ft at 9:45am Feb 8 Observed: 2.47 ft at 10:00am Feb 8 Observed: 2.47 ft at 10:15am Feb 8 Observed: 2.47 ft at 10:30am Feb 8 Observed: 2.47 ft at 10:45am Feb 8 Observed: 2.47 ft at 11:00am Feb 8 Observed: 2.47 ft at 11:15am Feb 8 Observed: 2.46 ft at 11:30am Feb 8 Observed: 2.46 ft at 11:45am Feb 8 Observed: 2.46 ft at 12:00pm Feb 8 Observed: 2.46 ft at 12:15pm Feb 8 Observed: 2.46 ft at 12:30pm Feb 8 Observed: 2.46 ft at 12:45pm Feb 8 Observed: 2.46 ft at 1:00pm Feb 8 Observed: 2.46 ft at 1:15pm Feb 8 Observed: 2.46 ft at 1:30pm Feb 8 Observed: 2.46 ft at 1:45pm Feb 8 Observed: 2.46 ft at 2:00pm Feb 8 Observed: 2.46 ft at 2:15pm Feb 8 Observed: 2.46 ft at 2:30pm Feb 8 Observed: 2.46 ft at 2:45pm Feb 8 Observed: 2.46 ft at 3:00pm Feb 8 Observed: 2.46 ft at 3:15pm Feb 8 Observed: 2.46 ft at 3:30pm Feb 8 Observed: 2.46 ft at 3:45pm Feb 8 Observed: 2.46 ft at 4:00pm Feb 8 Observed: 2.46 ft at 4:15pm Feb 8 Observed: 2.46 ft at 4:30pm Feb 8 Observed: 2.46 ft at 4:45pm Feb 8 Observed: 2.46 ft at 5:00pm Feb 8 Observed: 2.46 ft at 5:15pm Feb 8 Observed: 2.46 ft at 5:30pm Feb 8 Observed: 2.46 ft at 5:45pm Feb 8 Observed: 2.46 ft at 6:00pm Feb 8 Observed: 2.46 ft at 6:15pm Feb 8 Observed: 2.46 ft at 6:30pm Feb 8 Observed: 2.46 ft at 6:45pm Feb 8 Observed: 2.46 ft at 7:00pm Feb 8 Observed: 2.46 ft at 7:15pm Feb 8 Observed: 2.46 ft at 7:30pm Feb 8 Observed: 2.46 ft at 7:45pm Feb 8 Observed: 2.46 ft at 8:00pm Feb 8 Observed: 2.46 ft at 8:15pm Feb 8 Observed: 2.46 ft at 8:30pm Feb 8 Observed: 2.46 ft at 8:45pm Feb 8 Observed: 2.46 ft at 9:00pm Feb 8 Observed: 2.46 ft at 9:15pm Feb 8 Observed: 2.46 ft at 9:30pm Feb 8 Observed: 2.46 ft at 9:45pm Feb 8 Observed: 2.46 ft at 10:00pm Feb 8 Observed: 2.46 ft at 10:15pm Feb 8 Observed: 2.46 ft at 10:30pm Feb 8 Observed: 2.46 ft at 10:45pm Feb 8 Observed: 2.46 ft at 11:00pm Feb 8 Observed: 2.46 ft at 11:15pm Feb 8 Observed: 2.46 ft at 11:30pm Feb 8 Observed: 2.46 ft at 11:45pm Feb 8 Observed: 2.46 ft at 12:00am Feb 9 Observed: 2.46 ft at 12:15am Feb 9 Observed: 2.46 ft at 12:30am Feb 9 Observed: 2.46 ft at 12:45am Feb 9 Observed: 2.46 ft at 1:00am Feb 9 Observed: 2.46 ft at 1:15am Feb 9 Observed: 2.46 ft at 1:30am Feb 9 Observed: 2.46 ft at 1:45am Feb 9 Observed: 2.46 ft at 2:00am Feb 9 Observed: 2.46 ft at 2:15am Feb 9 Observed: 2.46 ft at 2:30am Feb 9 Observed: 2.46 ft at 2:45am Feb 9 Observed: 2.46 ft at 3:00am Feb 9 Observed: 2.46 ft at 3:15am Feb 9 Observed: 2.46 ft at 3:30am Feb 9 Observed: 2.46 ft at 3:45am Feb 9 Observed: 2.46 ft at 4:00am Feb 9 Observed: 2.46 ft at 4:15am Feb 9 Observed: 2.46 ft at 4:30am Feb 9 Observed: 2.46 ft at 4:45am Feb 9 Observed: 2.46 ft at 5:00am Feb 9 Observed: 2.46 ft at 5:15am Feb 9 Observed: 2.46 ft at 5:30am Feb 9 Observed: 2.46 ft at 5:45am Feb 9 Observed: 2.46 ft at 6:00am Feb 9 Observed: 2.46 ft at 6:15am Feb 9 Observed: 2.46 ft at 6:30am Feb 9 Observed: 2.46 ft at 6:45am Feb 9 Observed: 2.46 ft at 7:00am Feb 9 Observed: 2.46 ft at 7:15am Feb 9 Observed: 2.46 ft at 7:30am Feb 9 Observed: 2.46 ft at 7:45am Feb 9 Observed: 2.46 ft at 8:00am Feb 9 Observed: 2.46 ft at 8:15am Feb 9 Observed: 2.46 ft at 8:30am Feb 9 Observed: 2.45 ft at 8:45am Feb 9 Observed: 2.45 ft at 9:00am Feb 9 Observed: 2.45 ft at 9:15am Feb 9 Observed: 2.45 ft at 9:30am Feb 9 Observed: 2.45 ft at 9:45am Feb 9 Observed: 2.45 ft at 10:00am Feb 9 Observed: 2.45 ft at 10:15am Feb 9 Observed: 2.45 ft at 10:30am Feb 9 Observed: 2.45 ft at 10:45am Feb 9 Observed: 2.45 ft at 11:00am Feb 9 Observed: 2.44 ft at 11:15am Feb 9 Observed: 2.44 ft at 11:30am Feb 9 Observed: 2.44 ft at 11:45am Feb 9 Observed: 2.44 ft at 12:00pm Feb 9 Observed: 2.44 ft at 12:15pm Feb 9 Observed: 2.44 ft at 12:30pm Feb 9 Observed: 2.44 ft at 12:45pm Feb 9 Observed: 2.44 ft at 1:00pm Feb 9 Observed: 2.43 ft at 1:15pm Feb 9 Observed: 2.43 ft at 1:30pm Feb 9 Observed: 2.43 ft at 1:45pm Feb 9 Observed: 2.43 ft at 2:00pm Feb 9 Observed: 2.43 ft at 2:15pm Feb 9 Observed: 2.43 ft at 2:30pm Feb 9 Observed: 2.43 ft at 2:45pm Feb 9 Observed: 2.43 ft at 3:00pm Feb 9 Observed: 2.43 ft at 3:15pm Feb 9 Observed: 2.43 ft at 3:30pm Feb 9 Observed: 2.43 ft at 3:45pm Feb 9 Observed: 2.43 ft at 4:00pm Feb 9 Observed: 2.43 ft at 4:15pm Feb 9 Observed: 2.43 ft at 4:30pm Feb 9 Observed: 2.43 ft at 4:45pm Feb 9 Observed: 2.43 ft at 5:00pm Feb 9 Observed: 2.43 ft at 5:15pm Feb 9 Observed: 2.43 ft at 5:30pm Feb 9 Observed: 2.43 ft at 5:45pm Feb 9 Observed: 2.43 ft at 6:00pm Feb 9 Observed: 2.43 ft at 6:15pm Feb 9 Observed: 2.43 ft at 6:30pm Feb 9 Observed: 2.43 ft at 6:45pm Feb 9 Observed: 2.43 ft at 7:00pm Feb 9 Observed: 2.43 ft at 7:15pm Feb 9 Observed: 2.43 ft at 7:30pm Feb 9 Observed: 2.43 ft at 7:45pm Feb 9 Observed: 2.43 ft at 8:00pm Feb 9 Observed: 2.43 ft at 8:15pm Feb 9 Observed: 2.43 ft at 8:30pm Feb 9 Observed: 2.43 ft at 8:45pm Feb 9 Observed: 2.43 ft at 9:00pm Feb 9 Observed: 2.43 ft at 9:15pm Feb 9 Observed: 2.43 ft at 9:30pm Feb 9 Observed: 2.43 ft at 9:45pm Feb 9 Forecast: 2.4 ft at 1:00pm Feb 9 Forecast: 2.4 ft at 7:00pm Feb 9 Forecast: 2.4 ft at 1:00am Feb 10 Forecast: 2.4 ft at 7:00am Feb 10 Forecast: 2.4 ft at 1:00pm Feb 10 Forecast: 2.4 ft at 7:00pm Feb 10 Forecast: 2.3 ft at 1:00am Feb 11 Forecast: 2.3 ft at 7:00am Feb 11 Forecast: 2.3 ft at 1:00pm Feb 11 Graph Created (10:35pm Feb 9, 2010) Observed Forecast (issued 10:43am Feb 9) USGS--Water Resources of the United States WGTM3 (plotting HGIRG) Gage 0 Datum: 244.27 Latest observed value: 2.43 ft at 9:45 PM EST 9-Feb-2010. Flood Stage is 7.0 ft. Stage (ft) Flow (kcfs)
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Tabular Data
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NOTE: Forecasts for the Squannacook River at West Groton are issued routinely year-round.

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Flood Categories (in feet)
Major Flood Stage:9.5
Moderate Flood Stage:8.5
Flood Stage:7
Action Stage:6

Historical 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) 7.62 ft on 10/21/1996
Show More Historical Crests

Low Water Records
Currently none available.

Squannacook River at West Groton location map

Flood Impacts Collapse
9.0 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.
8.0 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: 42.634100° N, Longitude: 71.658300° W, Horizontal Datum: NAD83

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 N/A N/A Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 N/A N/A Older USGS topographic maps, NGVD29 benchmarks
MSL N/A N/A Older USGS topographic maps, MSL benchmarks
Other NULL NULL  

Other Data Sources:
U.S. Geological Survey (USGS) Data and Site Info for West Groton

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.

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