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Weather Forecast Office Gray, ME Northeast River Forecast Center
Hydrograph River at a Glance Download Weekly Chance of
Exceeding Levels		 Chance of Exceeding Levels
During Entire Period
Souhegan River at Merrimack Stage (ft)Flow (kcfs)Observed: 2.74 ft at 4:15AM May 19, 2013Observed: 2.74 ft at 4:30AM May 19, 2013Observed: 2.74 ft at 4:45AM May 19, 2013Observed: 2.74 ft at 5:00AM May 19, 2013Observed: 2.74 ft at 5:15AM May 19, 2013Observed: 2.74 ft at 5:30AM May 19, 2013Observed: 2.74 ft at 5:45AM May 19, 2013Observed: 2.74 ft at 6:00AM May 19, 2013Observed: 2.74 ft at 6:15AM May 19, 2013Observed: 2.74 ft at 6:30AM May 19, 2013Observed: 2.74 ft at 6:45AM May 19, 2013Observed: 2.74 ft at 7:00AM May 19, 2013Observed: 2.74 ft at 7:15AM May 19, 2013Observed: 2.74 ft at 7:30AM May 19, 2013Observed: 2.74 ft at 7:45AM May 19, 2013Observed: 2.74 ft at 8:00AM May 19, 2013Observed: 2.74 ft at 8:15AM May 19, 2013Observed: 2.74 ft at 8:30AM May 19, 2013Observed: 2.74 ft at 8:45AM May 19, 2013Observed: 2.74 ft at 9:00AM May 19, 2013Observed: 2.74 ft at 9:15AM May 19, 2013Observed: 2.74 ft at 9:30AM May 19, 2013Observed: 2.74 ft at 9:45AM May 19, 2013Observed: 2.74 ft at 10:00AM May 19, 2013Observed: 2.75 ft at 10:15AM May 19, 2013Observed: 2.75 ft at 10:30AM May 19, 2013Observed: 2.76 ft at 10:45AM May 19, 2013Observed: 2.77 ft at 11:00AM May 19, 2013Observed: 2.78 ft at 11:15AM May 19, 2013Observed: 2.78 ft at 11:30AM May 19, 2013Observed: 2.79 ft at 11:45AM May 19, 2013Observed: 2.8 ft at 12:00PM May 19, 2013Observed: 2.81 ft at 12:15PM May 19, 2013Observed: 2.81 ft at 12:30PM May 19, 2013Observed: 2.82 ft at 12:45PM May 19, 2013Observed: 2.82 ft at 1:00PM May 19, 2013Observed: 2.83 ft at 1:15PM May 19, 2013Observed: 2.83 ft at 1:30PM May 19, 2013Observed: 2.84 ft at 1:45PM May 19, 2013Observed: 2.84 ft at 2:00PM May 19, 2013Observed: 2.84 ft at 2:15PM May 19, 2013Observed: 2.84 ft at 2:30PM May 19, 2013Observed: 2.84 ft at 2:31PM May 19, 2013Highest Observation: 2.85 ft at 2:45PM May 19, 2013Highest Observation: 2.85 ft at 3:00PM May 19, 2013Observed: 2.84 ft at 3:15PM May 19, 2013Observed: 2.84 ft at 3:30PM May 19, 2013Observed: 2.84 ft at 3:45PM May 19, 2013Observed: 2.84 ft at 4:00PM May 19, 2013Observed: 2.83 ft at 4:15PM May 19, 2013Observed: 2.83 ft at 4:30PM May 19, 2013Observed: 2.83 ft at 4:45PM May 19, 2013Observed: 2.83 ft at 5:00PM May 19, 2013Observed: 2.82 ft at 5:15PM May 19, 2013Observed: 2.82 ft at 5:30PM May 19, 2013Observed: 2.81 ft at 5:45PM May 19, 2013Observed: 2.81 ft at 6:00PM May 19, 2013Observed: 2.81 ft at 6:15PM May 19, 2013Observed: 2.8 ft at 6:30PM May 19, 2013Observed: 2.8 ft at 6:45PM May 19, 2013Observed: 2.79 ft at 7:00PM May 19, 2013Observed: 2.79 ft at 7:15PM May 19, 2013Observed: 2.78 ft at 7:30PM May 19, 2013Observed: 2.78 ft at 7:45PM May 19, 2013Observed: 2.78 ft at 8:00PM May 19, 2013Observed: 2.77 ft at 8:15PM May 19, 2013Observed: 2.77 ft at 8:30PM May 19, 2013Observed: 2.77 ft at 8:45PM May 19, 2013Observed: 2.77 ft at 8:46PM May 19, 2013Observed: 2.76 ft at 9:00PM May 19, 2013Observed: 2.76 ft at 9:15PM May 19, 2013Observed: 2.75 ft at 9:30PM May 19, 2013Observed: 2.75 ft at 9:45PM May 19, 2013Observed: 2.75 ft at 10:00PM May 19, 2013Observed: 2.75 ft at 10:15PM May 19, 2013Observed: 2.74 ft at 10:30PM May 19, 2013Observed: 2.74 ft at 10:45PM May 19, 2013Observed: 2.74 ft at 11:00PM May 19, 2013Observed: 2.74 ft at 11:15PM May 19, 2013Observed: 2.74 ft at 11:30PM May 19, 2013Observed: 2.74 ft at 11:45PM May 19, 2013Observed: 2.74 ft at 12:00AM May 20, 2013Observed: 2.74 ft at 12:15AM May 20, 2013Observed: 2.74 ft at 12:30AM May 20, 2013Observed: 2.74 ft at 12:45AM May 20, 2013Observed: 2.74 ft at 1:00AM May 20, 2013Observed: 2.74 ft at 1:15AM May 20, 2013Observed: 2.74 ft at 1:30AM May 20, 2013Observed: 2.72 ft at 1:45AM May 20, 2013Observed: 2.72 ft at 2:00AM May 20, 2013Observed: 2.72 ft at 2:15AM May 20, 2013Observed: 2.72 ft at 2:30AM May 20, 2013Observed: 2.72 ft at 2:45AM May 20, 2013Observed: 2.72 ft at 2:46AM May 20, 2013Observed: 2.71 ft at 3:00AM May 20, 2013Observed: 2.71 ft at 3:15AM May 20, 2013Observed: 2.71 ft at 3:30AM May 20, 2013Observed: 2.71 ft at 3:45AM May 20, 2013Observed: 2.71 ft at 4:00AM May 20, 2013Observed: 2.71 ft at 4:15AM May 20, 2013Observed: 2.71 ft at 4:30AM May 20, 2013Observed: 2.71 ft at 4:45AM May 20, 2013Observed: 2.7 ft at 5:00AM May 20, 2013Observed: 2.7 ft at 5:15AM May 20, 2013Observed: 2.7 ft at 5:30AM May 20, 2013Observed: 2.7 ft at 5:45AM May 20, 2013Observed: 2.7 ft at 6:00AM May 20, 2013Observed: 2.7 ft at 6:15AM May 20, 2013Observed: 2.7 ft at 6:30AM May 20, 2013Observed: 2.7 ft at 6:45AM May 20, 2013Observed: 2.7 ft at 7:00AM May 20, 2013Observed: 2.69 ft at 7:15AM May 20, 2013Observed: 2.69 ft at 7:30AM May 20, 2013Observed: 2.69 ft at 7:45AM May 20, 2013Observed: 2.69 ft at 8:00AM May 20, 2013Observed: 2.69 ft at 8:15AM May 20, 2013Observed: 2.69 ft at 8:30AM May 20, 2013Observed: 2.69 ft at 8:45AM May 20, 2013Observed: 2.69 ft at 9:00AM May 20, 2013Observed: 2.69 ft at 9:15AM May 20, 2013Observed: 2.69 ft at 9:30AM May 20, 2013Observed: 2.69 ft at 9:45AM May 20, 2013Observed: 2.69 ft at 10:00AM May 20, 2013Observed: 2.69 ft at 10:15AM May 20, 2013Observed: 2.69 ft at 10:30AM May 20, 2013Observed: 2.69 ft at 10:45AM May 20, 2013Observed: 2.69 ft at 11:00AM May 20, 2013Observed: 2.69 ft at 11:15AM May 20, 2013Observed: 2.69 ft at 11:30AM May 20, 2013Observed: 2.69 ft at 11:45AM May 20, 2013Observed: 2.69 ft at 12:00PM May 20, 2013Observed: 2.69 ft at 12:15PM May 20, 2013Observed: 2.69 ft at 12:30PM May 20, 2013Observed: 2.69 ft at 12:45PM May 20, 2013Observed: 2.69 ft at 1:00PM May 20, 2013Observed: 2.69 ft at 1:15PM May 20, 2013Observed: 2.69 ft at 1:30PM May 20, 2013Observed: 2.67 ft at 1:45PM May 20, 2013Observed: 2.67 ft at 2:00PM May 20, 2013Observed: 2.69 ft at 2:15PM May 20, 2013Observed: 2.67 ft at 2:30PM May 20, 2013Observed: 2.67 ft at 2:45PM May 20, 2013Observed: 2.67 ft at 3:00PM May 20, 2013Observed: 2.67 ft at 3:15PM May 20, 2013Observed: 2.67 ft at 3:30PM May 20, 2013Observed: 2.66 ft at 3:45PM May 20, 2013Observed: 2.66 ft at 4:00PM May 20, 2013Observed: 2.66 ft at 4:15PM May 20, 2013Observed: 2.66 ft at 4:30PM May 20, 2013Observed: 2.66 ft at 4:45PM May 20, 2013Observed: 2.66 ft at 5:00PM May 20, 2013Observed: 2.65 ft at 5:15PM May 20, 2013Observed: 2.66 ft at 5:30PM May 20, 2013Observed: 2.66 ft at 5:45PM May 20, 2013Observed: 2.65 ft at 6:00PM May 20, 2013Observed: 2.65 ft at 6:15PM May 20, 2013Observed: 2.65 ft at 6:30PM May 20, 2013Observed: 2.66 ft at 6:45PM May 20, 2013Observed: 2.66 ft at 7:00PM May 20, 2013Observed: 2.65 ft at 7:15PM May 20, 2013Observed: 2.66 ft at 7:30PM May 20, 2013Observed: 2.66 ft at 7:45PM May 20, 2013Observed: 2.66 ft at 8:00PM May 20, 2013Observed: 2.66 ft at 8:15PM May 20, 2013Observed: 2.66 ft at 8:30PM May 20, 2013Observed: 2.66 ft at 8:45PM May 20, 2013Observed: 2.66 ft at 8:46PM May 20, 2013Observed: 2.67 ft at 9:00PM May 20, 2013Observed: 2.67 ft at 9:15PM May 20, 2013Observed: 2.67 ft at 9:30PM May 20, 2013Observed: 2.67 ft at 9:45PM May 20, 2013Observed: 2.67 ft at 10:00PM May 20, 2013Observed: 2.67 ft at 10:15PM May 20, 2013Observed: 2.69 ft at 10:30PM May 20, 2013Observed: 2.69 ft at 10:45PM May 20, 2013Observed: 2.69 ft at 11:00PM May 20, 2013Observed: 2.69 ft at 11:15PM May 20, 2013Observed: 2.69 ft at 11:30PM May 20, 2013Observed: 2.69 ft at 11:45PM May 20, 2013Observed: 2.69 ft at 12:00AM May 21, 2013Observed: 2.69 ft at 12:15AM May 21, 2013Observed: 2.69 ft at 12:30AM May 21, 2013Observed: 2.69 ft at 12:45AM May 21, 2013Observed: 2.69 ft at 1:00AM May 21, 2013Observed: 2.69 ft at 1:15AM May 21, 2013Observed: 2.69 ft at 1:30AM May 21, 2013Observed: 2.69 ft at 1:45AM May 21, 2013Observed: 2.69 ft at 2:00AM May 21, 2013Observed: 2.69 ft at 2:15AM May 21, 2013Observed: 2.69 ft at 2:30AM May 21, 2013Observed: 2.69 ft at 2:45AM May 21, 2013Observed: 2.69 ft at 2:46AM May 21, 2013Observed: 2.69 ft at 3:00AM May 21, 2013Observed: 2.69 ft at 3:15AM May 21, 2013Observed: 2.69 ft at 3:30AM May 21, 2013Observed: 2.69 ft at 3:45AM May 21, 2013Observed: 2.69 ft at 4:00AM May 21, 2013Observed: 2.69 ft at 4:15AM May 21, 2013Observed: 2.69 ft at 4:30AM May 21, 2013Observed: 2.69 ft at 4:45AM May 21, 2013Observed: 2.69 ft at 5:00AM May 21, 2013Observed: 2.69 ft at 5:15AM May 21, 2013Observed: 2.69 ft at 5:30AM May 21, 2013Observed: 2.69 ft at 5:45AM May 21, 2013Observed: 2.69 ft at 6:00AM May 21, 2013Observed: 2.69 ft at 6:15AM May 21, 2013Observed: 2.69 ft at 6:30AM May 21, 2013Observed: 2.69 ft at 6:45AM May 21, 2013Observed: 2.69 ft at 7:00AM May 21, 2013Observed: 2.69 ft at 7:15AM May 21, 2013Observed: 2.69 ft at 7:30AM May 21, 2013Observed: 2.69 ft at 7:45AM May 21, 2013Observed: 2.69 ft at 8:00AM May 21, 2013Observed: 2.69 ft at 8:15AM May 21, 2013Observed: 2.69 ft at 8:30AM May 21, 2013Observed: 2.69 ft at 8:45AM May 21, 2013Observed: 2.69 ft at 8:46AM May 21, 2013Observed: 2.7 ft at 9:00AM May 21, 2013Observed: 2.7 ft at 9:15AM May 21, 2013Observed: 2.7 ft at 9:30AM May 21, 2013Observed: 2.7 ft at 9:45AM May 21, 2013Observed: 2.7 ft at 10:00AM May 21, 2013Observed: 2.7 ft at 10:15AM May 21, 2013Observed: 2.71 ft at 10:30AM May 21, 2013Observed: 2.7 ft at 10:45AM May 21, 2013Observed: 2.71 ft at 11:00AM May 21, 2013Observed: 2.71 ft at 11:15AM May 21, 2013Observed: 2.71 ft at 11:30AM May 21, 2013Observed: 2.71 ft at 11:45AM May 21, 2013Observed: 2.71 ft at 12:00PM May 21, 2013Observed: 2.71 ft at 12:15PM May 21, 2013Observed: 2.71 ft at 12:30PM May 21, 2013Observed: 2.71 ft at 12:45PM May 21, 2013Observed: 2.71 ft at 1:00PM May 21, 2013Observed: 2.71 ft at 1:15PM May 21, 2013Observed: 2.71 ft at 1:30PM May 21, 2013Observed: 2.71 ft at 1:45PM May 21, 2013Observed: 2.7 ft at 2:00PM May 21, 2013Observed: 2.71 ft at 2:15PM May 21, 2013Observed: 2.71 ft at 2:30PM May 21, 2013Observed: 2.71 ft at 2:45PM May 21, 2013Observed: 2.71 ft at 2:46PM May 21, 2013Observed: 2.71 ft at 3:00PM May 21, 2013Observed: 2.71 ft at 3:15PM May 21, 2013Observed: 2.71 ft at 3:30PM May 21, 2013Observed: 2.71 ft at 3:45PM May 21, 2013Observed: 2.71 ft at 4:00PM May 21, 2013Observed: 2.71 ft at 4:15PM May 21, 2013Observed: 2.71 ft at 4:30PM May 21, 2013Observed: 2.71 ft at 4:45PM May 21, 2013Observed: 2.71 ft at 5:00PM May 21, 2013Observed: 2.71 ft at 5:15PM May 21, 2013Observed: 2.71 ft at 5:30PM May 21, 2013Observed: 2.71 ft at 5:45PM May 21, 2013Observed: 2.71 ft at 6:00PM May 21, 2013Observed: 2.71 ft at 6:15PM May 21, 2013Observed: 2.71 ft at 6:30PM May 21, 2013Observed: 2.71 ft at 6:45PM May 21, 2013Observed: 2.71 ft at 7:00PM May 21, 2013Observed: 2.71 ft at 7:15PM May 21, 2013Observed: 2.72 ft at 7:30PM May 21, 2013Observed: 2.71 ft at 7:45PM May 21, 2013Observed: 2.71 ft at 8:00PM May 21, 2013Observed: 2.71 ft at 8:15PM May 21, 2013Observed: 2.72 ft at 8:30PM May 21, 2013Observed: 2.71 ft at 8:45PM May 21, 2013Observed: 2.72 ft at 9:00PM May 21, 2013Observed: 2.72 ft at 9:15PM May 21, 2013Observed: 2.74 ft at 9:30PM May 21, 2013Observed: 2.74 ft at 9:45PM May 21, 2013Observed: 2.74 ft at 10:00PM May 21, 2013Observed: 2.74 ft at 10:15PM May 21, 2013Observed: 2.74 ft at 10:30PM May 21, 2013Observed: 2.74 ft at 10:45PM May 21, 2013Observed: 2.74 ft at 11:00PM May 21, 2013Observed: 2.74 ft at 11:15PM May 21, 2013Observed: 2.74 ft at 11:30PM May 21, 2013Observed: 2.74 ft at 11:45PM May 21, 2013Observed: 2.74 ft at 12:00AM May 22, 2013Observed: 2.74 ft at 12:15AM May 22, 2013Observed: 2.74 ft at 12:30AM May 22, 2013Observed: 2.76 ft at 12:45AM May 22, 2013Observed: 2.77 ft at 1:00AM May 22, 2013Observed: 2.77 ft at 1:15AM May 22, 2013Observed: 2.77 ft at 1:30AM May 22, 2013Observed: 2.78 ft at 1:45AM May 22, 2013Observed: 2.78 ft at 2:00AM May 22, 2013Observed: 2.78 ft at 2:15AM May 22, 2013Observed: 2.79 ft at 2:30AM May 22, 2013Observed: 2.81 ft at 3:01AM May 22, 2013Highest Forecast: 2.8 ft 8:00AM May 22, 2013Highest Forecast: 2.8 ft 2:00PM May 22, 2013Forecast: 2.7 ft 8:00PM May 22, 2013Forecast: 2.7 ft 2:00AM May 23, 2013Forecast: 2.7 ft 8:00AM May 23, 2013Forecast: 2.7 ft 2:00PM May 23, 2013Forecast: 2.7 ft 8:00PM May 23, 2013Forecast: 2.7 ft 2:00AM May 24, 2013Forecast: 2.7 ft 8:00AM May 24, 2013USGS--Water Resources of the United StatesSOHN3(plotting HGIRG) Graph Created (4:11AM May 22, 2013)ObservedForecast (issued 11:10AM May 21)Latest observed value: 2.81 ft at 3:01 AM EDT 22-May-2013. Flood Stage is 9 ft
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About this graph
Tabular Data
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Datum: Not Available
Metadata
NOTE: Forecasts for the Souhegan River at Merrimack are issued routinely year-round.
Return to Area Map
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

Low Water Records
Legend
Gauge Location
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
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  

Other Data Sources:
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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
Gray Weather Forecast Office
P.O. Box 1208, 1 Weather Lane, Route 231
Gray, ME 04039
(207) 688-3216
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