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Hydrograph River at a Glance Download
Souhegan River at Merrimack Stage (ft)Flow (kcfs)Observed: 2.57 ft at 11:30PM Aug 25, 2014Observed: 2.57 ft at 11:45PM Aug 25, 2014Observed: 2.57 ft at 12:00AM Aug 26, 2014Observed: 2.57 ft at 12:15AM Aug 26, 2014Observed: 2.57 ft at 12:30AM Aug 26, 2014Observed: 2.57 ft at 12:45AM Aug 26, 2014Observed: 2.57 ft at 1:00AM Aug 26, 2014Observed: 2.57 ft at 1:15AM Aug 26, 2014Observed: 2.57 ft at 1:30AM Aug 26, 2014Observed: 2.57 ft at 1:31AM Aug 26, 2014Observed: 2.57 ft at 1:45AM Aug 26, 2014Observed: 2.57 ft at 2:00AM Aug 26, 2014Observed: 2.57 ft at 2:15AM Aug 26, 2014Observed: 2.57 ft at 2:30AM Aug 26, 2014Observed: 2.57 ft at 2:45AM Aug 26, 2014Observed: 2.57 ft at 3:00AM Aug 26, 2014Observed: 2.57 ft at 3:15AM Aug 26, 2014Observed: 2.57 ft at 3:30AM Aug 26, 2014Observed: 2.56 ft at 3:45AM Aug 26, 2014Observed: 2.56 ft at 4:00AM Aug 26, 2014Observed: 2.56 ft at 4:15AM Aug 26, 2014Observed: 2.56 ft at 4:30AM Aug 26, 2014Observed: 2.55 ft at 4:45AM Aug 26, 2014Observed: 2.55 ft at 5:00AM Aug 26, 2014Observed: 2.55 ft at 5:15AM Aug 26, 2014Observed: 2.55 ft at 5:30AM Aug 26, 2014Observed: 2.55 ft at 5:45AM Aug 26, 2014Observed: 2.55 ft at 6:00AM Aug 26, 2014Observed: 2.54 ft at 6:15AM Aug 26, 2014Observed: 2.54 ft at 6:30AM Aug 26, 2014Observed: 2.54 ft at 6:45AM Aug 26, 2014Observed: 2.54 ft at 7:00AM Aug 26, 2014Observed: 2.54 ft at 7:15AM Aug 26, 2014Observed: 2.53 ft at 7:30AM Aug 26, 2014Observed: 2.53 ft at 7:31AM Aug 26, 2014Observed: 2.53 ft at 7:45AM Aug 26, 2014Observed: 2.53 ft at 8:00AM Aug 26, 2014Observed: 2.53 ft at 8:15AM Aug 26, 2014Observed: 2.53 ft at 8:30AM Aug 26, 2014Observed: 2.53 ft at 8:45AM Aug 26, 2014Observed: 2.53 ft at 9:00AM Aug 26, 2014Observed: 2.53 ft at 9:15AM Aug 26, 2014Observed: 2.53 ft at 9:30AM Aug 26, 2014Observed: 2.53 ft at 9:45AM Aug 26, 2014Observed: 2.53 ft at 10:00AM Aug 26, 2014Observed: 2.53 ft at 10:15AM Aug 26, 2014Observed: 2.53 ft at 10:30AM Aug 26, 2014Observed: 2.53 ft at 10:45AM Aug 26, 2014Observed: 2.53 ft at 11:00AM Aug 26, 2014Observed: 2.53 ft at 11:15AM Aug 26, 2014Observed: 2.53 ft at 11:30AM Aug 26, 2014Observed: 2.54 ft at 11:45AM Aug 26, 2014Observed: 2.54 ft at 12:00PM Aug 26, 2014Observed: 2.54 ft at 12:15PM Aug 26, 2014Observed: 2.55 ft at 12:30PM Aug 26, 2014Observed: 2.55 ft at 12:45PM Aug 26, 2014Observed: 2.55 ft at 1:00PM Aug 26, 2014Observed: 2.56 ft at 1:15PM Aug 26, 2014Observed: 2.56 ft at 1:30PM Aug 26, 2014Observed: 2.57 ft at 1:45PM Aug 26, 2014Observed: 2.57 ft at 2:00PM Aug 26, 2014Observed: 2.57 ft at 2:15PM Aug 26, 2014Observed: 2.58 ft at 2:30PM Aug 26, 2014Observed: 2.58 ft at 2:45PM Aug 26, 2014Observed: 2.59 ft at 3:00PM Aug 26, 2014Observed: 2.59 ft at 3:15PM Aug 26, 2014Observed: 2.59 ft at 3:30PM Aug 26, 2014Observed: 2.6 ft at 3:45PM Aug 26, 2014Observed: 2.6 ft at 4:00PM Aug 26, 2014Observed: 2.6 ft at 4:15PM Aug 26, 2014Observed: 2.61 ft at 4:30PM Aug 26, 2014Observed: 2.61 ft at 4:45PM Aug 26, 2014Observed: 2.61 ft at 5:00PM Aug 26, 2014Observed: 2.62 ft at 5:15PM Aug 26, 2014Observed: 2.62 ft at 5:30PM Aug 26, 2014Observed: 2.62 ft at 5:45PM Aug 26, 2014Observed: 2.62 ft at 6:00PM Aug 26, 2014Observed: 2.62 ft at 6:15PM Aug 26, 2014Highest Observation: 2.64 ft at 6:30PM Aug 26, 2014Highest Observation: 2.64 ft at 6:45PM Aug 26, 2014Highest Observation: 2.64 ft at 7:00PM Aug 26, 2014Highest Observation: 2.64 ft at 7:15PM Aug 26, 2014Highest Observation: 2.64 ft at 7:30PM Aug 26, 2014Highest Observation: 2.64 ft at 7:45PM Aug 26, 2014Highest Observation: 2.64 ft at 8:00PM Aug 26, 2014Highest Observation: 2.64 ft at 8:15PM Aug 26, 2014Highest Observation: 2.64 ft at 8:30PM Aug 26, 2014Highest Observation: 2.64 ft at 8:45PM Aug 26, 2014Highest Observation: 2.64 ft at 9:00PM Aug 26, 2014Highest Observation: 2.64 ft at 9:15PM Aug 26, 2014Highest Observation: 2.64 ft at 9:30PM Aug 26, 2014Highest Observation: 2.64 ft at 9:45PM Aug 26, 2014Highest Observation: 2.64 ft at 10:00PM Aug 26, 2014Highest Observation: 2.64 ft at 10:15PM Aug 26, 2014Highest Observation: 2.64 ft at 10:30PM Aug 26, 2014Highest Observation: 2.64 ft at 10:45PM Aug 26, 2014Highest Observation: 2.64 ft at 11:00PM Aug 26, 2014Highest Observation: 2.64 ft at 11:15PM Aug 26, 2014Highest Observation: 2.64 ft at 11:30PM Aug 26, 2014Highest Observation: 2.64 ft at 11:45PM Aug 26, 2014Highest Observation: 2.64 ft at 12:00AM Aug 27, 2014Highest Observation: 2.64 ft at 12:15AM Aug 27, 2014Highest Observation: 2.64 ft at 12:30AM Aug 27, 2014Highest Observation: 2.64 ft at 12:45AM Aug 27, 2014Highest Observation: 2.64 ft at 1:00AM Aug 27, 2014Highest Observation: 2.64 ft at 1:15AM Aug 27, 2014Highest Observation: 2.64 ft at 1:30AM Aug 27, 2014Highest Observation: 2.64 ft at 1:45AM Aug 27, 2014Highest Observation: 2.64 ft at 2:00AM Aug 27, 2014Highest Observation: 2.64 ft at 2:15AM Aug 27, 2014Highest Observation: 2.64 ft at 2:30AM Aug 27, 2014Highest Observation: 2.64 ft at 2:45AM Aug 27, 2014Highest Observation: 2.64 ft at 3:00AM Aug 27, 2014Highest Observation: 2.64 ft at 3:15AM Aug 27, 2014Highest Observation: 2.64 ft at 3:30AM Aug 27, 2014Highest Observation: 2.64 ft at 3:45AM Aug 27, 2014Highest Observation: 2.64 ft at 4:00AM Aug 27, 2014Highest Observation: 2.64 ft at 4:15AM Aug 27, 2014Highest Observation: 2.64 ft at 4:30AM Aug 27, 2014Highest Observation: 2.64 ft at 4:45AM Aug 27, 2014Highest Observation: 2.64 ft at 5:00AM Aug 27, 2014Observed: 2.62 ft at 5:15AM Aug 27, 2014Observed: 2.62 ft at 5:30AM Aug 27, 2014Observed: 2.62 ft at 5:45AM Aug 27, 2014Observed: 2.62 ft at 6:00AM Aug 27, 2014Observed: 2.61 ft at 6:15AM Aug 27, 2014Observed: 2.61 ft at 6:30AM Aug 27, 2014Observed: 2.61 ft at 6:45AM Aug 27, 2014Observed: 2.61 ft at 7:00AM Aug 27, 2014Observed: 2.6 ft at 7:15AM Aug 27, 2014Observed: 2.6 ft at 7:30AM Aug 27, 2014Observed: 2.6 ft at 7:31AM Aug 27, 2014Observed: 2.6 ft at 7:45AM Aug 27, 2014Observed: 2.59 ft at 8:00AM Aug 27, 2014Observed: 2.59 ft at 8:15AM Aug 27, 2014Observed: 2.59 ft at 8:30AM Aug 27, 2014Observed: 2.56 ft at 10:45AM Aug 27, 2014Observed: 2.56 ft at 11:00AM Aug 27, 2014Observed: 2.56 ft at 11:15AM Aug 27, 2014Observed: 2.56 ft at 11:30AM Aug 27, 2014Observed: 2.56 ft at 11:45AM Aug 27, 2014Observed: 2.55 ft at 12:00PM Aug 27, 2014Observed: 2.55 ft at 12:15PM Aug 27, 2014Observed: 2.54 ft at 12:30PM Aug 27, 2014Observed: 2.55 ft at 12:45PM Aug 27, 2014Observed: 2.54 ft at 1:00PM Aug 27, 2014Observed: 2.54 ft at 1:15PM Aug 27, 2014Observed: 2.54 ft at 1:30PM Aug 27, 2014Observed: 2.54 ft at 1:45PM Aug 27, 2014Observed: 2.54 ft at 1:46PM Aug 27, 2014Observed: 2.53 ft at 2:00PM Aug 27, 2014Observed: 2.53 ft at 2:15PM Aug 27, 2014Observed: 2.53 ft at 2:30PM Aug 27, 2014Observed: 2.53 ft at 2:45PM Aug 27, 2014Observed: 2.53 ft at 3:00PM Aug 27, 2014Observed: 2.52 ft at 3:15PM Aug 27, 2014Observed: 2.52 ft at 3:30PM Aug 27, 2014Observed: 2.52 ft at 3:45PM Aug 27, 2014Observed: 2.52 ft at 4:00PM Aug 27, 2014Observed: 2.52 ft at 4:15PM Aug 27, 2014Observed: 2.51 ft at 4:30PM Aug 27, 2014Observed: 2.51 ft at 4:45PM Aug 27, 2014Observed: 2.51 ft at 5:00PM Aug 27, 2014Observed: 2.51 ft at 5:15PM Aug 27, 2014Observed: 2.51 ft at 5:30PM Aug 27, 2014Observed: 2.51 ft at 5:45PM Aug 27, 2014Observed: 2.51 ft at 6:00PM Aug 27, 2014Observed: 2.51 ft at 6:15PM Aug 27, 2014Observed: 2.51 ft at 6:30PM Aug 27, 2014Observed: 2.51 ft at 6:45PM Aug 27, 2014Observed: 2.5 ft at 7:00PM Aug 27, 2014Observed: 2.5 ft at 7:15PM Aug 27, 2014Observed: 2.5 ft at 7:30PM Aug 27, 2014Observed: 2.5 ft at 7:45PM Aug 27, 2014Observed: 2.5 ft at 7:46PM Aug 27, 2014Observed: 2.5 ft at 8:00PM Aug 27, 2014Observed: 2.5 ft at 8:15PM Aug 27, 2014Observed: 2.5 ft at 8:30PM Aug 27, 2014Observed: 2.5 ft at 8:45PM Aug 27, 2014Observed: 2.5 ft at 9:00PM Aug 27, 2014Observed: 2.5 ft at 9:15PM Aug 27, 2014Observed: 2.5 ft at 9:30PM Aug 27, 2014Observed: 2.5 ft at 9:45PM Aug 27, 2014Observed: 2.49 ft at 10:00PM Aug 27, 2014Observed: 2.49 ft at 10:15PM Aug 27, 2014Observed: 2.49 ft at 10:30PM Aug 27, 2014Observed: 2.49 ft at 10:45PM Aug 27, 2014Observed: 2.49 ft at 11:00PM Aug 27, 2014Observed: 2.49 ft at 11:15PM Aug 27, 2014Observed: 2.49 ft at 11:30PM Aug 27, 2014Observed: 2.49 ft at 11:45PM Aug 27, 2014Observed: 2.49 ft at 12:00AM Aug 28, 2014Observed: 2.49 ft at 12:15AM Aug 28, 2014Observed: 2.49 ft at 12:30AM Aug 28, 2014Observed: 2.49 ft at 12:45AM Aug 28, 2014Observed: 2.49 ft at 1:00AM Aug 28, 2014Observed: 2.48 ft at 1:15AM Aug 28, 2014Observed: 2.49 ft at 1:30AM Aug 28, 2014Observed: 2.49 ft at 1:45AM Aug 28, 2014Observed: 2.49 ft at 1:46AM Aug 28, 2014Observed: 2.49 ft at 2:00AM Aug 28, 2014Observed: 2.48 ft at 2:15AM Aug 28, 2014Observed: 2.48 ft at 2:30AM Aug 28, 2014Observed: 2.48 ft at 2:45AM Aug 28, 2014Observed: 2.48 ft at 3:00AM Aug 28, 2014Observed: 2.48 ft at 3:15AM Aug 28, 2014Observed: 2.48 ft at 3:30AM Aug 28, 2014Observed: 2.48 ft at 3:45AM Aug 28, 2014Observed: 2.48 ft at 4:00AM Aug 28, 2014Observed: 2.48 ft at 4:15AM Aug 28, 2014Observed: 2.48 ft at 4:30AM Aug 28, 2014Observed: 2.47 ft at 4:45AM Aug 28, 2014Observed: 2.47 ft at 5:00AM Aug 28, 2014Observed: 2.47 ft at 5:15AM Aug 28, 2014Observed: 2.47 ft at 5:30AM Aug 28, 2014Observed: 2.47 ft at 5:45AM Aug 28, 2014Observed: 2.47 ft at 6:00AM Aug 28, 2014Observed: 2.47 ft at 6:15AM Aug 28, 2014Observed: 2.47 ft at 6:30AM Aug 28, 2014Observed: 2.47 ft at 6:45AM Aug 28, 2014Observed: 2.47 ft at 7:00AM Aug 28, 2014Observed: 2.47 ft at 7:15AM Aug 28, 2014Observed: 2.47 ft at 7:30AM Aug 28, 2014Observed: 2.47 ft at 7:45AM Aug 28, 2014Observed: 2.47 ft at 8:00AM Aug 28, 2014Observed: 2.46 ft at 8:15AM Aug 28, 2014Observed: 2.46 ft at 8:30AM Aug 28, 2014Observed: 2.47 ft at 8:45AM Aug 28, 2014Observed: 2.46 ft at 9:00AM Aug 28, 2014Observed: 2.46 ft at 9:15AM Aug 28, 2014Observed: 2.46 ft at 9:30AM Aug 28, 2014Observed: 2.47 ft at 9:45AM Aug 28, 2014Observed: 2.46 ft at 10:00AM Aug 28, 2014Observed: 2.46 ft at 10:15AM Aug 28, 2014Observed: 2.46 ft at 10:30AM Aug 28, 2014Observed: 2.45 ft at 10:45AM Aug 28, 2014Observed: 2.46 ft at 11:00AM Aug 28, 2014Observed: 2.46 ft at 11:15AM Aug 28, 2014Observed: 2.46 ft at 11:30AM Aug 28, 2014Observed: 2.46 ft at 11:45AM Aug 28, 2014Observed: 2.45 ft at 12:00PM Aug 28, 2014Observed: 2.46 ft at 12:15PM Aug 28, 2014Observed: 2.46 ft at 12:30PM Aug 28, 2014Observed: 2.46 ft at 12:45PM Aug 28, 2014Observed: 2.45 ft at 1:00PM Aug 28, 2014Observed: 2.45 ft at 1:15PM Aug 28, 2014Observed: 2.45 ft at 1:30PM Aug 28, 2014Observed: 2.45 ft at 1:45PM Aug 28, 2014Observed: 2.45 ft at 1:46PM Aug 28, 2014Observed: 2.45 ft at 2:00PM Aug 28, 2014Observed: 2.45 ft at 2:15PM Aug 28, 2014Observed: 2.45 ft at 2:30PM Aug 28, 2014Observed: 2.45 ft at 2:45PM Aug 28, 2014Observed: 2.45 ft at 3:00PM Aug 28, 2014Observed: 2.45 ft at 3:15PM Aug 28, 2014Observed: 2.45 ft at 3:30PM Aug 28, 2014Observed: 2.45 ft at 3:45PM Aug 28, 2014Observed: 2.44 ft at 4:00PM Aug 28, 2014Observed: 2.45 ft at 4:15PM Aug 28, 2014Observed: 2.45 ft at 4:30PM Aug 28, 2014Observed: 2.44 ft at 4:45PM Aug 28, 2014Observed: 2.44 ft at 5:00PM Aug 28, 2014Observed: 2.45 ft at 5:15PM Aug 28, 2014Observed: 2.44 ft at 5:30PM Aug 28, 2014Observed: 2.44 ft at 5:45PM Aug 28, 2014Observed: 2.44 ft at 6:00PM Aug 28, 2014Observed: 2.44 ft at 6:15PM Aug 28, 2014Observed: 2.44 ft at 6:30PM Aug 28, 2014Observed: 2.44 ft at 6:45PM Aug 28, 2014Observed: 2.44 ft at 7:00PM Aug 28, 2014Observed: 2.44 ft at 7:15PM Aug 28, 2014Observed: 2.44 ft at 7:30PM Aug 28, 2014Observed: 2.44 ft at 7:45PM Aug 28, 2014Observed: 2.44 ft at 7:46PM Aug 28, 2014Observed: 2.44 ft at 8:00PM Aug 28, 2014Observed: 2.44 ft at 8:15PM Aug 28, 2014Observed: 2.44 ft at 8:30PM Aug 28, 2014Observed: 2.44 ft at 8:45PM Aug 28, 2014Observed: 2.44 ft at 9:00PM Aug 28, 2014Observed: 2.44 ft at 9:15PM Aug 28, 2014Observed: 2.44 ft at 9:30PM Aug 28, 2014Observed: 2.44 ft at 9:45PM Aug 28, 2014Observed: 2.44 ft at 10:00PM Aug 28, 2014Observed: 2.44 ft at 10:15PM Aug 28, 2014Observed: 2.44 ft at 10:30PM Aug 28, 2014Highest Forecast: 2.5 ft 2:00AM Aug 29, 2014Highest Forecast: 2.5 ft 8:00AM Aug 29, 2014Highest Forecast: 2.5 ft 2:00PM Aug 29, 2014Highest Forecast: 2.5 ft 8:00PM Aug 29, 2014Highest Forecast: 2.5 ft 2:00AM Aug 30, 2014Highest Forecast: 2.5 ft 8:00AM Aug 30, 2014Forecast: 2.4 ft 2:00PM Aug 30, 2014Forecast: 2.4 ft 8:00PM Aug 30, 2014Forecast: 2.4 ft 2:00AM Aug 31, 2014Forecast: 2.4 ft 8:00AM Aug 31, 2014USGS--Water Resources of the United StatesSOHN3(plotting HGIRG) Graph Created (11:16PM Aug 28, 2014)ObservedForecast (issued 10:38AM Aug 28)Latest observed value: 2.44 ft at 10:30 PM EDT 28-Aug-2014. Flood Stage is 9 ft
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About this graph
Tabular Data (UTC)
Tabular Data (EDT)
XML Data
RSS Files
Datum: Not Available
Metadata
NOTE: Forecasts for the Souhegan River at Merrimack are issued routinely year-round.
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Flood Categories (in feet)
Major Flood Stage:13
Moderate Flood Stage:11
Flood Stage:9
Action Stage:8

Historical Crests
(1) 16.20 ft on 03/19/1936
(2) 12.78 ft on 09/21/1938
(3) 12.71 ft on 04/17/2007
(4) 11.82 ft on 04/08/1924
(5) 10.88 ft on 06/25/1944
Show More Historical Crests

(P): Preliminary values subject to further review.

Low Water Records
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
13 FLOODING WILL AFFECT HOMES IN THE BEACON DRIVE AREA OF MERRIMACK AS WELL AS OTHER LOW LYING SECTIONS UPSTREAM INTO AMHERST AND MILFORD. PEOPLE LIVING IN FLOOD PRONE AREAS SHOULD MOVE VALUABLES TO HIGHER GROUND.
11 FLOODING WILL AFFECT HOMES IN THE BEACON DRIVE AREA OF MERRIMACK AS WELL AS OTHER LOW LYING SECTIONS UPSTREAM INTO AMHERST AND MILFORD. PEOPLE LIVING IN FLOOD PRONE AREAS SHOULD MOVE VALUABLES TO A HIGHER FLOOR.
10 FLOODING IS LIKELY IN LOW LYING AREAS ALONG THE RIVER THROUGH THE TOWN OF MERRIMACK. SEVERAL HOMES ALONG A SMALL PORTION OF BEACON DRIVE WILL EXPERIENCE FLOODING. MINOR FLOODING OF LOW LYING AREAS IN AMHERST IS ALSO EXPECTED. ANY OUTDOOR EQUIPMENT OR FURNITURE SHOULD BE MOVED TO HIGHER GROUND.
9 FLOODING IS LIKELY IN LOW LYING AREAS ALONG THE RIVER THROUGH THE TOWN OF MERRIMACK. ANY OUTDOOR FURNITURE OR EQUIPMENT SHOULD BE MOVED TO HIGHER GROUND AT THIS TIME.
About This Location Collapse

Latitude: 42.857500° N, Longitude: 71.506667° W, Horizontal Datum: NAD83/WGS84

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)
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 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:

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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
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Gray Weather Forecast Office
P.O. Box 1208, 1 Weather Lane, Route 231
Gray, ME 04039
(207) 688-3216
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Page last modified: 27-Aug-2014 7:12 PM
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