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Weather Forecast Office Boston, MA 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)Highest Observation: 5.44 ft at 3:30AM Jun 15, 2013Observed: 5.43 ft at 3:45AM Jun 15, 2013Observed: 5.43 ft at 4:00AM Jun 15, 2013Observed: 5.43 ft at 4:15AM Jun 15, 2013Observed: 5.42 ft at 4:30AM Jun 15, 2013Observed: 5.41 ft at 4:45AM Jun 15, 2013Observed: 5.4 ft at 5:00AM Jun 15, 2013Observed: 5.4 ft at 5:15AM Jun 15, 2013Observed: 5.4 ft at 5:16AM Jun 15, 2013Observed: 5.39 ft at 5:30AM Jun 15, 2013Observed: 5.38 ft at 5:45AM Jun 15, 2013Observed: 5.38 ft at 6:00AM Jun 15, 2013Observed: 5.37 ft at 6:15AM Jun 15, 2013Observed: 5.35 ft at 6:30AM Jun 15, 2013Observed: 5.35 ft at 6:45AM Jun 15, 2013Observed: 5.34 ft at 7:00AM Jun 15, 2013Observed: 5.33 ft at 7:15AM Jun 15, 2013Observed: 5.32 ft at 7:30AM Jun 15, 2013Observed: 5.31 ft at 7:45AM Jun 15, 2013Observed: 5.3 ft at 8:00AM Jun 15, 2013Observed: 5.29 ft at 8:15AM Jun 15, 2013Observed: 5.29 ft at 8:30AM Jun 15, 2013Observed: 5.28 ft at 8:45AM Jun 15, 2013Observed: 5.27 ft at 9:00AM Jun 15, 2013Observed: 5.26 ft at 9:15AM Jun 15, 2013Observed: 5.25 ft at 9:30AM Jun 15, 2013Observed: 5.24 ft at 9:45AM Jun 15, 2013Observed: 5.23 ft at 10:00AM Jun 15, 2013Observed: 5.22 ft at 10:15AM Jun 15, 2013Observed: 5.21 ft at 10:30AM Jun 15, 2013Observed: 5.21 ft at 10:45AM Jun 15, 2013Observed: 5.2 ft at 11:00AM Jun 15, 2013Observed: 5.19 ft at 11:15AM Jun 15, 2013Observed: 5.18 ft at 11:30AM Jun 15, 2013Observed: 5.17 ft at 11:45AM Jun 15, 2013Observed: 5.17 ft at 12:00PM Jun 15, 2013Observed: 5.15 ft at 12:15PM Jun 15, 2013Observed: 5.15 ft at 12:30PM Jun 15, 2013Observed: 5.14 ft at 12:45PM Jun 15, 2013Observed: 5.13 ft at 1:00PM Jun 15, 2013Observed: 5.13 ft at 1:15PM Jun 15, 2013Observed: 5.11 ft at 1:30PM Jun 15, 2013Observed: 5.11 ft at 1:45PM Jun 15, 2013Observed: 5.1 ft at 2:00PM Jun 15, 2013Observed: 5.09 ft at 2:15PM Jun 15, 2013Observed: 5.08 ft at 2:30PM Jun 15, 2013Observed: 5.08 ft at 2:45PM Jun 15, 2013Observed: 5.07 ft at 3:00PM Jun 15, 2013Observed: 5.06 ft at 3:15PM Jun 15, 2013Observed: 5.06 ft at 3:30PM Jun 15, 2013Observed: 5.05 ft at 3:45PM Jun 15, 2013Observed: 5.04 ft at 4:00PM Jun 15, 2013Observed: 5.03 ft at 4:15PM Jun 15, 2013Observed: 5.02 ft at 4:30PM Jun 15, 2013Observed: 5.02 ft at 4:45PM Jun 15, 2013Observed: 5.01 ft at 5:00PM Jun 15, 2013Observed: 5.01 ft at 5:15PM Jun 15, 2013Observed: 5 ft at 5:30PM Jun 15, 2013Observed: 4.99 ft at 5:45PM Jun 15, 2013Observed: 4.99 ft at 6:00PM Jun 15, 2013Observed: 4.98 ft at 6:15PM Jun 15, 2013Observed: 4.97 ft at 6:30PM Jun 15, 2013Observed: 4.96 ft at 6:45PM Jun 15, 2013Observed: 4.96 ft at 7:00PM Jun 15, 2013Observed: 4.95 ft at 7:15PM Jun 15, 2013Observed: 4.95 ft at 7:30PM Jun 15, 2013Observed: 4.94 ft at 7:45PM Jun 15, 2013Observed: 4.93 ft at 8:00PM Jun 15, 2013Observed: 4.93 ft at 8:15PM Jun 15, 2013Observed: 4.92 ft at 8:30PM Jun 15, 2013Observed: 4.91 ft at 8:45PM Jun 15, 2013Observed: 4.91 ft at 9:00PM Jun 15, 2013Observed: 4.9 ft at 9:15PM Jun 15, 2013Observed: 4.89 ft at 9:30PM Jun 15, 2013Observed: 4.89 ft at 9:45PM Jun 15, 2013Observed: 4.87 ft at 10:00PM Jun 15, 2013Observed: 4.87 ft at 10:15PM Jun 15, 2013Observed: 4.86 ft at 10:30PM Jun 15, 2013Observed: 4.86 ft at 10:45PM Jun 15, 2013Observed: 4.85 ft at 11:00PM Jun 15, 2013Observed: 4.85 ft at 11:15PM Jun 15, 2013Observed: 4.85 ft at 11:16PM Jun 15, 2013Observed: 4.84 ft at 11:30PM Jun 15, 2013Observed: 4.83 ft at 11:45PM Jun 15, 2013Observed: 4.83 ft at 12:00AM Jun 16, 2013Observed: 4.82 ft at 12:15AM Jun 16, 2013Observed: 4.81 ft at 12:30AM Jun 16, 2013Observed: 4.81 ft at 12:45AM Jun 16, 2013Observed: 4.8 ft at 1:00AM Jun 16, 2013Observed: 4.79 ft at 1:15AM Jun 16, 2013Observed: 4.79 ft at 1:30AM Jun 16, 2013Observed: 4.78 ft at 1:45AM Jun 16, 2013Observed: 4.77 ft at 2:00AM Jun 16, 2013Observed: 4.77 ft at 2:15AM Jun 16, 2013Observed: 4.76 ft at 2:30AM Jun 16, 2013Observed: 4.75 ft at 2:45AM Jun 16, 2013Observed: 4.75 ft at 3:00AM Jun 16, 2013Observed: 4.74 ft at 3:15AM Jun 16, 2013Observed: 4.73 ft at 3:30AM Jun 16, 2013Observed: 4.73 ft at 3:45AM Jun 16, 2013Observed: 4.73 ft at 4:00AM Jun 16, 2013Observed: 4.72 ft at 4:15AM Jun 16, 2013Observed: 4.71 ft at 4:30AM Jun 16, 2013Observed: 4.71 ft at 4:45AM Jun 16, 2013Observed: 4.7 ft at 5:00AM Jun 16, 2013Observed: 4.7 ft at 5:15AM Jun 16, 2013Observed: 4.7 ft at 5:16AM Jun 16, 2013Observed: 4.69 ft at 5:30AM Jun 16, 2013Observed: 4.69 ft at 5:45AM Jun 16, 2013Observed: 4.68 ft at 6:00AM Jun 16, 2013Observed: 4.67 ft at 6:15AM Jun 16, 2013Observed: 4.67 ft at 6:30AM Jun 16, 2013Observed: 4.67 ft at 6:45AM Jun 16, 2013Observed: 4.66 ft at 7:00AM Jun 16, 2013Observed: 4.66 ft at 7:15AM Jun 16, 2013Observed: 4.65 ft at 7:30AM Jun 16, 2013Observed: 4.65 ft at 7:45AM Jun 16, 2013Observed: 4.64 ft at 8:00AM Jun 16, 2013Observed: 4.64 ft at 8:15AM Jun 16, 2013Observed: 4.63 ft at 8:30AM Jun 16, 2013Observed: 4.63 ft at 8:45AM Jun 16, 2013Observed: 4.63 ft at 9:00AM Jun 16, 2013Observed: 4.62 ft at 9:15AM Jun 16, 2013Observed: 4.62 ft at 9:30AM Jun 16, 2013Observed: 4.61 ft at 9:45AM Jun 16, 2013Observed: 4.61 ft at 10:00AM Jun 16, 2013Observed: 4.6 ft at 10:15AM Jun 16, 2013Observed: 4.6 ft at 10:30AM Jun 16, 2013Observed: 4.59 ft at 10:45AM Jun 16, 2013Observed: 4.59 ft at 11:00AM Jun 16, 2013Observed: 4.59 ft at 11:15AM Jun 16, 2013Observed: 4.59 ft at 11:16AM Jun 16, 2013Observed: 4.58 ft at 11:30AM Jun 16, 2013Observed: 4.58 ft at 11:45AM Jun 16, 2013Observed: 4.56 ft at 12:00PM Jun 16, 2013Observed: 4.56 ft at 12:15PM Jun 16, 2013Observed: 4.56 ft at 12:30PM Jun 16, 2013Observed: 4.56 ft at 12:45PM Jun 16, 2013Observed: 4.54 ft at 1:00PM Jun 16, 2013Observed: 4.54 ft at 1:15PM Jun 16, 2013Observed: 4.54 ft at 1:30PM Jun 16, 2013Observed: 4.54 ft at 1:45PM Jun 16, 2013Observed: 4.53 ft at 2:00PM Jun 16, 2013Observed: 4.53 ft at 2:15PM Jun 16, 2013Observed: 4.53 ft at 2:30PM Jun 16, 2013Observed: 4.52 ft at 2:45PM Jun 16, 2013Observed: 4.51 ft at 3:00PM Jun 16, 2013Observed: 4.51 ft at 3:15PM Jun 16, 2013Observed: 4.51 ft at 3:30PM Jun 16, 2013Observed: 4.49 ft at 3:45PM Jun 16, 2013Observed: 4.49 ft at 4:00PM Jun 16, 2013Observed: 4.49 ft at 4:15PM Jun 16, 2013Observed: 4.49 ft at 4:30PM Jun 16, 2013Observed: 4.49 ft at 4:45PM Jun 16, 2013Observed: 4.48 ft at 5:00PM Jun 16, 2013Observed: 4.48 ft at 5:15PM Jun 16, 2013Observed: 4.47 ft at 5:30PM Jun 16, 2013Observed: 4.47 ft at 5:45PM Jun 16, 2013Observed: 4.47 ft at 6:00PM Jun 16, 2013Observed: 4.46 ft at 6:15PM Jun 16, 2013Observed: 4.46 ft at 6:30PM Jun 16, 2013Observed: 4.44 ft at 6:45PM Jun 16, 2013Observed: 4.44 ft at 7:00PM Jun 16, 2013Observed: 4.44 ft at 7:15PM Jun 16, 2013Observed: 4.44 ft at 7:30PM Jun 16, 2013Observed: 4.43 ft at 7:45PM Jun 16, 2013Observed: 4.43 ft at 8:00PM Jun 16, 2013Observed: 4.43 ft at 8:15PM Jun 16, 2013Observed: 4.43 ft at 8:30PM Jun 16, 2013Observed: 4.42 ft at 8:45PM Jun 16, 2013Observed: 4.42 ft at 9:00PM Jun 16, 2013Observed: 4.41 ft at 9:15PM Jun 16, 2013Observed: 4.41 ft at 9:30PM Jun 16, 2013Observed: 4.4 ft at 9:45PM Jun 16, 2013Observed: 4.39 ft at 10:00PM Jun 16, 2013Observed: 4.38 ft at 10:15PM Jun 16, 2013Observed: 4.38 ft at 10:30PM Jun 16, 2013Observed: 4.37 ft at 10:45PM Jun 16, 2013Observed: 4.36 ft at 11:00PM Jun 16, 2013Observed: 4.35 ft at 11:15PM Jun 16, 2013Observed: 4.34 ft at 11:30PM Jun 16, 2013Observed: 4.34 ft at 11:31PM Jun 16, 2013Observed: 4.33 ft at 11:45PM Jun 16, 2013Observed: 4.31 ft at 12:00AM Jun 17, 2013Observed: 4.31 ft at 12:15AM Jun 17, 2013Observed: 4.3 ft at 12:30AM Jun 17, 2013Observed: 4.29 ft at 12:45AM Jun 17, 2013Observed: 4.29 ft at 1:00AM Jun 17, 2013Observed: 4.28 ft at 1:15AM Jun 17, 2013Observed: 4.28 ft at 1:30AM Jun 17, 2013Observed: 4.28 ft at 1:45AM Jun 17, 2013Observed: 4.27 ft at 2:00AM Jun 17, 2013Observed: 4.27 ft at 2:15AM Jun 17, 2013Observed: 4.27 ft at 2:30AM Jun 17, 2013Observed: 4.26 ft at 2:45AM Jun 17, 2013Observed: 4.26 ft at 3:00AM Jun 17, 2013Observed: 4.26 ft at 3:15AM Jun 17, 2013Observed: 4.26 ft at 3:30AM Jun 17, 2013Observed: 4.26 ft at 3:45AM Jun 17, 2013Observed: 4.26 ft at 4:00AM Jun 17, 2013Observed: 4.26 ft at 4:15AM Jun 17, 2013Observed: 4.26 ft at 4:30AM Jun 17, 2013Observed: 4.25 ft at 4:45AM Jun 17, 2013Observed: 4.25 ft at 5:00AM Jun 17, 2013Observed: 4.26 ft at 5:15AM Jun 17, 2013Observed: 4.25 ft at 5:30AM Jun 17, 2013Observed: 4.25 ft at 5:31AM Jun 17, 2013Observed: 4.25 ft at 5:45AM Jun 17, 2013Observed: 4.25 ft at 6:00AM Jun 17, 2013Observed: 4.25 ft at 6:15AM Jun 17, 2013Observed: 4.25 ft at 6:30AM Jun 17, 2013Observed: 4.24 ft at 6:45AM Jun 17, 2013Observed: 4.24 ft at 7:00AM Jun 17, 2013Observed: 4.23 ft at 7:15AM Jun 17, 2013Observed: 4.23 ft at 7:30AM Jun 17, 2013Observed: 4.23 ft at 7:45AM Jun 17, 2013Observed: 4.23 ft at 8:00AM Jun 17, 2013Observed: 4.22 ft at 8:15AM Jun 17, 2013Observed: 4.22 ft at 8:30AM Jun 17, 2013Observed: 4.22 ft at 8:45AM Jun 17, 2013Observed: 4.21 ft at 9:00AM Jun 17, 2013Observed: 4.21 ft at 9:15AM Jun 17, 2013Observed: 4.21 ft at 9:30AM Jun 17, 2013Observed: 4.2 ft at 9:45AM Jun 17, 2013Observed: 4.2 ft at 10:00AM Jun 17, 2013Observed: 4.19 ft at 10:15AM Jun 17, 2013Observed: 4.19 ft at 10:30AM Jun 17, 2013Observed: 4.18 ft at 10:45AM Jun 17, 2013Observed: 4.19 ft at 11:00AM Jun 17, 2013Observed: 4.18 ft at 11:15AM Jun 17, 2013Observed: 4.17 ft at 11:30AM Jun 17, 2013Observed: 4.18 ft at 11:45AM Jun 17, 2013Observed: 4.17 ft at 12:00PM Jun 17, 2013Observed: 4.17 ft at 12:15PM Jun 17, 2013Observed: 4.16 ft at 12:30PM Jun 17, 2013Observed: 4.16 ft at 12:45PM Jun 17, 2013Observed: 4.15 ft at 1:00PM Jun 17, 2013Observed: 4.16 ft at 1:15PM Jun 17, 2013Observed: 4.15 ft at 1:30PM Jun 17, 2013Observed: 4.14 ft at 1:45PM Jun 17, 2013Observed: 4.14 ft at 2:00PM Jun 17, 2013Observed: 4.14 ft at 2:15PM Jun 17, 2013Observed: 4.13 ft at 2:30PM Jun 17, 2013Observed: 4.13 ft at 2:45PM Jun 17, 2013Observed: 4.13 ft at 3:00PM Jun 17, 2013Observed: 4.13 ft at 3:15PM Jun 17, 2013Observed: 4.12 ft at 3:30PM Jun 17, 2013Observed: 4.12 ft at 3:45PM Jun 17, 2013Observed: 4.11 ft at 4:00PM Jun 17, 2013Observed: 4.11 ft at 4:15PM Jun 17, 2013Observed: 4.1 ft at 4:30PM Jun 17, 2013Observed: 4.1 ft at 4:45PM Jun 17, 2013Observed: 4.09 ft at 5:00PM Jun 17, 2013Observed: 4.09 ft at 5:15PM Jun 17, 2013Observed: 4.09 ft at 5:30PM Jun 17, 2013Observed: 4.09 ft at 5:31PM Jun 17, 2013Observed: 4.09 ft at 5:45PM Jun 17, 2013Observed: 4.09 ft at 6:00PM Jun 17, 2013Observed: 4.09 ft at 6:15PM Jun 17, 2013Observed: 4.08 ft at 6:30PM Jun 17, 2013Observed: 4.07 ft at 6:45PM Jun 17, 2013Observed: 4.07 ft at 7:00PM Jun 17, 2013Observed: 4.07 ft at 7:15PM Jun 17, 2013Observed: 4.07 ft at 7:30PM Jun 17, 2013Observed: 4.07 ft at 7:45PM Jun 17, 2013Observed: 4.06 ft at 8:00PM Jun 17, 2013Observed: 4.06 ft at 8:15PM Jun 17, 2013Observed: 4.06 ft at 8:30PM Jun 17, 2013Observed: 4.06 ft at 8:45PM Jun 17, 2013Observed: 4.05 ft at 9:00PM Jun 17, 2013Observed: 4.05 ft at 9:15PM Jun 17, 2013Observed: 4.05 ft at 9:30PM Jun 17, 2013Observed: 4.04 ft at 9:45PM Jun 17, 2013Observed: 4.04 ft at 10:00PM Jun 17, 2013Observed: 4.04 ft at 10:15PM Jun 17, 2013Observed: 4.03 ft at 10:30PM Jun 17, 2013Observed: 4.03 ft at 10:45PM Jun 17, 2013Observed: 4.03 ft at 11:00PM Jun 17, 2013Observed: 4.02 ft at 11:15PM Jun 17, 2013Observed: 4.02 ft at 11:30PM Jun 17, 2013Observed: 4.01 ft at 11:45PM Jun 17, 2013Observed: 4.01 ft at 12:00AM Jun 18, 2013Observed: 4 ft at 12:15AM Jun 18, 2013Observed: 4 ft at 12:30AM Jun 18, 2013Observed: 3.99 ft at 12:45AM Jun 18, 2013Observed: 3.99 ft at 1:00AM Jun 18, 2013Observed: 3.98 ft at 1:15AM Jun 18, 2013Observed: 3.98 ft at 1:30AM Jun 18, 2013Observed: 3.97 ft at 1:45AM Jun 18, 2013Observed: 3.97 ft at 2:00AM Jun 18, 2013Observed: 3.97 ft at 2:15AM Jun 18, 2013Observed: 3.96 ft at 2:30AM Jun 18, 2013Highest Forecast: 4 ft 8:00AM Jun 18, 2013Highest Forecast: 4 ft 2:00PM Jun 18, 2013Forecast: 3.9 ft 8:00PM Jun 18, 2013Forecast: 3.9 ft 2:00AM Jun 19, 2013Forecast: 3.9 ft 8:00AM Jun 19, 2013Forecast: 3.8 ft 2:00PM Jun 19, 2013Forecast: 3.8 ft 8:00PM Jun 19, 2013Forecast: 3.8 ft 2:00AM Jun 20, 2013Forecast: 3.7 ft 8:00AM Jun 20, 2013USGS--Water Resources of the United StatesSOHN3(plotting HGIRG) Graph Created (3:21AM Jun 18, 2013)ObservedForecast (issued 10:57AM Jun 17)Latest observed value: 3.96 ft at 2:30 AM EDT 18-Jun-2013. Flood Stage is 9 ft
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About this graph
Tabular Data
XML Data
RSS Files
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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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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