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Hydrograph River at a Glance Download
Souhegan River at Merrimack Stage (ft)Flow (kcfs)Observed: 2.52 ft at 11:45AM Jul 28, 2014Observed: 2.52 ft at 12:00PM Jul 28, 2014Observed: 2.51 ft at 12:15PM Jul 28, 2014Observed: 2.51 ft at 12:30PM Jul 28, 2014Observed: 2.51 ft at 12:45PM Jul 28, 2014Observed: 2.52 ft at 1:00PM Jul 28, 2014Observed: 2.51 ft at 1:15PM Jul 28, 2014Observed: 2.51 ft at 1:30PM Jul 28, 2014Observed: 2.51 ft at 1:45PM Jul 28, 2014Observed: 2.51 ft at 2:00PM Jul 28, 2014Observed: 2.51 ft at 2:15PM Jul 28, 2014Observed: 2.51 ft at 2:30PM Jul 28, 2014Observed: 2.51 ft at 2:45PM Jul 28, 2014Observed: 2.51 ft at 3:00PM Jul 28, 2014Observed: 2.51 ft at 3:15PM Jul 28, 2014Observed: 2.51 ft at 3:30PM Jul 28, 2014Observed: 2.51 ft at 3:45PM Jul 28, 2014Observed: 2.51 ft at 4:00PM Jul 28, 2014Observed: 2.51 ft at 4:15PM Jul 28, 2014Observed: 2.51 ft at 4:30PM Jul 28, 2014Observed: 2.51 ft at 4:31PM Jul 28, 2014Observed: 2.51 ft at 4:45PM Jul 28, 2014Observed: 2.51 ft at 5:00PM Jul 28, 2014Observed: 2.52 ft at 5:15PM Jul 28, 2014Observed: 2.52 ft at 5:30PM Jul 28, 2014Observed: 2.53 ft at 5:45PM Jul 28, 2014Observed: 2.54 ft at 6:00PM Jul 28, 2014Observed: 2.53 ft at 6:15PM Jul 28, 2014Observed: 2.53 ft at 6:30PM Jul 28, 2014Observed: 2.53 ft at 6:45PM Jul 28, 2014Observed: 2.53 ft at 7:00PM Jul 28, 2014Observed: 2.54 ft at 7:15PM Jul 28, 2014Observed: 2.53 ft at 7:30PM Jul 28, 2014Observed: 2.53 ft at 7:45PM Jul 28, 2014Observed: 2.53 ft at 8:00PM Jul 28, 2014Observed: 2.54 ft at 8:15PM Jul 28, 2014Observed: 2.54 ft at 8:30PM Jul 28, 2014Observed: 2.54 ft at 8:45PM Jul 28, 2014Observed: 2.54 ft at 9:00PM Jul 28, 2014Observed: 2.54 ft at 9:15PM Jul 28, 2014Observed: 2.54 ft at 9:30PM Jul 28, 2014Observed: 2.54 ft at 9:45PM Jul 28, 2014Observed: 2.54 ft at 10:00PM Jul 28, 2014Observed: 2.54 ft at 10:15PM Jul 28, 2014Observed: 2.55 ft at 10:30PM Jul 28, 2014Observed: 2.55 ft at 10:45PM Jul 28, 2014Observed: 2.55 ft at 10:46PM Jul 28, 2014Observed: 2.55 ft at 11:00PM Jul 28, 2014Observed: 2.55 ft at 11:15PM Jul 28, 2014Observed: 2.55 ft at 11:30PM Jul 28, 2014Observed: 2.55 ft at 11:45PM Jul 28, 2014Observed: 2.55 ft at 12:00AM Jul 29, 2014Observed: 2.55 ft at 12:15AM Jul 29, 2014Observed: 2.55 ft at 12:30AM Jul 29, 2014Observed: 2.55 ft at 12:45AM Jul 29, 2014Observed: 2.55 ft at 1:00AM Jul 29, 2014Observed: 2.55 ft at 1:15AM Jul 29, 2014Observed: 2.55 ft at 1:30AM Jul 29, 2014Observed: 2.55 ft at 1:45AM Jul 29, 2014Observed: 2.55 ft at 2:00AM Jul 29, 2014Observed: 2.55 ft at 2:15AM Jul 29, 2014Observed: 2.55 ft at 2:30AM Jul 29, 2014Observed: 2.55 ft at 2:45AM Jul 29, 2014Observed: 2.55 ft at 3:00AM Jul 29, 2014Observed: 2.55 ft at 3:15AM Jul 29, 2014Observed: 2.55 ft at 3:30AM Jul 29, 2014Observed: 2.55 ft at 3:45AM Jul 29, 2014Observed: 2.55 ft at 4:00AM Jul 29, 2014Observed: 2.55 ft at 4:15AM Jul 29, 2014Observed: 2.55 ft at 4:30AM Jul 29, 2014Observed: 2.55 ft at 4:45AM Jul 29, 2014Observed: 2.55 ft at 4:46AM Jul 29, 2014Observed: 2.55 ft at 5:00AM Jul 29, 2014Observed: 2.55 ft at 5:15AM Jul 29, 2014Observed: 2.55 ft at 5:30AM Jul 29, 2014Observed: 2.55 ft at 5:45AM Jul 29, 2014Observed: 2.55 ft at 6:00AM Jul 29, 2014Observed: 2.55 ft at 6:15AM Jul 29, 2014Observed: 2.55 ft at 6:30AM Jul 29, 2014Observed: 2.55 ft at 6:45AM Jul 29, 2014Observed: 2.56 ft at 7:00AM Jul 29, 2014Observed: 2.56 ft at 7:15AM Jul 29, 2014Observed: 2.56 ft at 7:30AM Jul 29, 2014Observed: 2.57 ft at 7:45AM Jul 29, 2014Observed: 2.57 ft at 8:00AM Jul 29, 2014Observed: 2.57 ft at 8:15AM Jul 29, 2014Observed: 2.58 ft at 8:30AM Jul 29, 2014Observed: 2.58 ft at 8:45AM Jul 29, 2014Observed: 2.58 ft at 9:00AM Jul 29, 2014Observed: 2.59 ft at 9:15AM Jul 29, 2014Observed: 2.59 ft at 9:30AM Jul 29, 2014Observed: 2.6 ft at 9:45AM Jul 29, 2014Observed: 2.6 ft at 10:00AM Jul 29, 2014Observed: 2.6 ft at 10:15AM Jul 29, 2014Observed: 2.6 ft at 10:30AM Jul 29, 2014Observed: 2.61 ft at 10:45AM Jul 29, 2014Observed: 2.61 ft at 11:00AM Jul 29, 2014Observed: 2.62 ft at 11:15AM Jul 29, 2014Observed: 2.62 ft at 11:30AM Jul 29, 2014Observed: 2.62 ft at 11:45AM Jul 29, 2014Observed: 2.62 ft at 12:00PM Jul 29, 2014Observed: 2.64 ft at 12:15PM Jul 29, 2014Observed: 2.64 ft at 12:30PM Jul 29, 2014Observed: 2.64 ft at 12:45PM Jul 29, 2014Observed: 2.64 ft at 1:00PM Jul 29, 2014Observed: 2.64 ft at 1:15PM Jul 29, 2014Observed: 2.64 ft at 1:30PM Jul 29, 2014Observed: 2.64 ft at 1:45PM Jul 29, 2014Observed: 2.64 ft at 2:00PM Jul 29, 2014Observed: 2.64 ft at 2:15PM Jul 29, 2014Observed: 2.64 ft at 2:30PM Jul 29, 2014Observed: 2.64 ft at 2:45PM Jul 29, 2014Observed: 2.64 ft at 3:00PM Jul 29, 2014Observed: 2.64 ft at 3:15PM Jul 29, 2014Observed: 2.64 ft at 3:30PM Jul 29, 2014Observed: 2.66 ft at 3:45PM Jul 29, 2014Observed: 2.66 ft at 4:00PM Jul 29, 2014Observed: 2.66 ft at 4:15PM Jul 29, 2014Observed: 2.66 ft at 4:30PM Jul 29, 2014Observed: 2.66 ft at 4:45PM Jul 29, 2014Observed: 2.66 ft at 5:00PM Jul 29, 2014Observed: 2.66 ft at 5:15PM Jul 29, 2014Observed: 2.66 ft at 5:30PM Jul 29, 2014Observed: 2.66 ft at 5:45PM Jul 29, 2014Observed: 2.66 ft at 6:00PM Jul 29, 2014Observed: 2.66 ft at 6:15PM Jul 29, 2014Observed: 2.66 ft at 6:30PM Jul 29, 2014Observed: 2.66 ft at 6:45PM Jul 29, 2014Observed: 2.66 ft at 7:00PM Jul 29, 2014Observed: 2.66 ft at 7:15PM Jul 29, 2014Observed: 2.66 ft at 7:30PM Jul 29, 2014Observed: 2.66 ft at 7:45PM Jul 29, 2014Observed: 2.66 ft at 8:00PM Jul 29, 2014Observed: 2.66 ft at 8:15PM Jul 29, 2014Observed: 2.66 ft at 8:30PM Jul 29, 2014Observed: 2.66 ft at 8:45PM Jul 29, 2014Observed: 2.67 ft at 9:00PM Jul 29, 2014Observed: 2.67 ft at 9:15PM Jul 29, 2014Observed: 2.67 ft at 9:30PM Jul 29, 2014Observed: 2.67 ft at 9:45PM Jul 29, 2014Observed: 2.67 ft at 10:00PM Jul 29, 2014Observed: 2.67 ft at 10:15PM Jul 29, 2014Observed: 2.67 ft at 10:30PM Jul 29, 2014Observed: 2.67 ft at 10:45PM Jul 29, 2014Observed: 2.67 ft at 10:46PM Jul 29, 2014Observed: 2.67 ft at 11:00PM Jul 29, 2014Observed: 2.67 ft at 11:15PM Jul 29, 2014Observed: 2.67 ft at 11:30PM Jul 29, 2014Observed: 2.67 ft at 11:45PM Jul 29, 2014Observed: 2.67 ft at 12:00AM Jul 30, 2014Observed: 2.67 ft at 12:15AM Jul 30, 2014Observed: 2.67 ft at 12:30AM Jul 30, 2014Observed: 2.67 ft at 12:45AM Jul 30, 2014Observed: 2.67 ft at 1:00AM Jul 30, 2014Observed: 2.67 ft at 1:15AM Jul 30, 2014Observed: 2.67 ft at 1:30AM Jul 30, 2014Observed: 2.67 ft at 1:45AM Jul 30, 2014Observed: 2.67 ft at 2:00AM Jul 30, 2014Observed: 2.67 ft at 2:15AM Jul 30, 2014Observed: 2.67 ft at 2:30AM Jul 30, 2014Observed: 2.67 ft at 2:45AM Jul 30, 2014Observed: 2.67 ft at 3:00AM Jul 30, 2014Observed: 2.67 ft at 3:15AM Jul 30, 2014Observed: 2.67 ft at 3:30AM Jul 30, 2014Observed: 2.67 ft at 3:45AM Jul 30, 2014Observed: 2.67 ft at 4:00AM Jul 30, 2014Observed: 2.67 ft at 4:15AM Jul 30, 2014Observed: 2.67 ft at 4:30AM Jul 30, 2014Observed: 2.67 ft at 4:45AM Jul 30, 2014Observed: 2.67 ft at 4:46AM Jul 30, 2014Observed: 2.67 ft at 5:00AM Jul 30, 2014Observed: 2.67 ft at 5:15AM Jul 30, 2014Observed: 2.67 ft at 5:30AM Jul 30, 2014Observed: 2.67 ft at 5:45AM Jul 30, 2014Observed: 2.67 ft at 6:00AM Jul 30, 2014Observed: 2.67 ft at 6:15AM Jul 30, 2014Observed: 2.67 ft at 6:30AM Jul 30, 2014Observed: 2.67 ft at 6:45AM Jul 30, 2014Observed: 2.67 ft at 7:00AM Jul 30, 2014Observed: 2.67 ft at 7:15AM Jul 30, 2014Observed: 2.67 ft at 7:30AM Jul 30, 2014Observed: 2.67 ft at 7:45AM Jul 30, 2014Observed: 2.67 ft at 8:00AM Jul 30, 2014Observed: 2.67 ft at 8:15AM Jul 30, 2014Observed: 2.67 ft at 8:30AM Jul 30, 2014Observed: 2.67 ft at 8:45AM Jul 30, 2014Observed: 2.67 ft at 9:00AM Jul 30, 2014Observed: 2.67 ft at 9:15AM Jul 30, 2014Observed: 2.67 ft at 9:30AM Jul 30, 2014Observed: 2.66 ft at 9:45AM Jul 30, 2014Observed: 2.66 ft at 10:00AM Jul 30, 2014Observed: 2.66 ft at 10:15AM Jul 30, 2014Observed: 2.66 ft at 10:30AM Jul 30, 2014Observed: 2.66 ft at 10:45AM Jul 30, 2014Observed: 2.66 ft at 10:46AM Jul 30, 2014Observed: 2.66 ft at 11:00AM Jul 30, 2014Observed: 2.66 ft at 11:15AM Jul 30, 2014Observed: 2.66 ft at 11:30AM Jul 30, 2014Observed: 2.66 ft at 11:45AM Jul 30, 2014Observed: 2.66 ft at 12:00PM Jul 30, 2014Observed: 2.66 ft at 12:15PM Jul 30, 2014Observed: 2.66 ft at 12:30PM Jul 30, 2014Observed: 2.66 ft at 12:45PM Jul 30, 2014Observed: 2.66 ft at 1:00PM Jul 30, 2014Observed: 2.66 ft at 1:15PM Jul 30, 2014Observed: 2.66 ft at 1:30PM Jul 30, 2014Observed: 2.66 ft at 1:45PM Jul 30, 2014Observed: 2.66 ft at 2:00PM Jul 30, 2014Observed: 2.64 ft at 2:15PM Jul 30, 2014Observed: 2.64 ft at 2:30PM Jul 30, 2014Observed: 2.64 ft at 2:45PM Jul 30, 2014Observed: 2.64 ft at 3:00PM Jul 30, 2014Observed: 2.64 ft at 3:15PM Jul 30, 2014Observed: 2.64 ft at 3:30PM Jul 30, 2014Observed: 2.64 ft at 3:45PM Jul 30, 2014Observed: 2.64 ft at 4:00PM Jul 30, 2014Observed: 2.64 ft at 4:15PM Jul 30, 2014Observed: 2.64 ft at 4:30PM Jul 30, 2014Observed: 2.64 ft at 4:45PM Jul 30, 2014Observed: 2.64 ft at 4:46PM Jul 30, 2014Observed: 2.64 ft at 5:00PM Jul 30, 2014Observed: 2.64 ft at 5:15PM Jul 30, 2014Observed: 2.64 ft at 5:30PM Jul 30, 2014Observed: 2.64 ft at 5:45PM Jul 30, 2014Observed: 2.64 ft at 6:00PM Jul 30, 2014Observed: 2.64 ft at 6:15PM Jul 30, 2014Observed: 2.64 ft at 6:30PM Jul 30, 2014Observed: 2.64 ft at 6:45PM Jul 30, 2014Observed: 2.64 ft at 7:00PM Jul 30, 2014Observed: 2.64 ft at 7:15PM Jul 30, 2014Observed: 2.64 ft at 7:30PM Jul 30, 2014Observed: 2.64 ft at 7:45PM Jul 30, 2014Observed: 2.64 ft at 8:00PM Jul 30, 2014Observed: 2.64 ft at 8:15PM Jul 30, 2014Observed: 2.64 ft at 8:30PM Jul 30, 2014Observed: 2.64 ft at 8:45PM Jul 30, 2014Observed: 2.64 ft at 9:00PM Jul 30, 2014Observed: 2.66 ft at 9:15PM Jul 30, 2014Observed: 2.66 ft at 9:30PM Jul 30, 2014Observed: 2.66 ft at 9:45PM Jul 30, 2014Observed: 2.66 ft at 10:00PM Jul 30, 2014Observed: 2.66 ft at 10:15PM Jul 30, 2014Observed: 2.67 ft at 10:30PM Jul 30, 2014Observed: 2.67 ft at 10:45PM Jul 30, 2014Observed: 2.67 ft at 10:46PM Jul 30, 2014Observed: 2.67 ft at 11:00PM Jul 30, 2014Observed: 2.68 ft at 11:15PM Jul 30, 2014Observed: 2.68 ft at 11:30PM Jul 30, 2014Observed: 2.69 ft at 11:45PM Jul 30, 2014Observed: 2.69 ft at 12:00AM Jul 31, 2014Observed: 2.71 ft at 12:15AM Jul 31, 2014Observed: 2.71 ft at 12:30AM Jul 31, 2014Observed: 2.71 ft at 12:45AM Jul 31, 2014Observed: 2.72 ft at 1:00AM Jul 31, 2014Observed: 2.72 ft at 1:15AM Jul 31, 2014Observed: 2.73 ft at 1:30AM Jul 31, 2014Observed: 2.73 ft at 1:45AM Jul 31, 2014Observed: 2.74 ft at 2:00AM Jul 31, 2014Observed: 2.74 ft at 2:15AM Jul 31, 2014Observed: 2.76 ft at 2:30AM Jul 31, 2014Observed: 2.76 ft at 2:45AM Jul 31, 2014Observed: 2.76 ft at 3:00AM Jul 31, 2014Observed: 2.76 ft at 3:15AM Jul 31, 2014Observed: 2.76 ft at 3:30AM Jul 31, 2014Observed: 2.76 ft at 3:45AM Jul 31, 2014Observed: 2.77 ft at 4:00AM Jul 31, 2014Observed: 2.77 ft at 4:15AM Jul 31, 2014Observed: 2.77 ft at 4:30AM Jul 31, 2014Observed: 2.77 ft at 4:45AM Jul 31, 2014Observed: 2.77 ft at 4:46AM Jul 31, 2014Observed: 2.78 ft at 5:00AM Jul 31, 2014Observed: 2.78 ft at 5:15AM Jul 31, 2014Observed: 2.78 ft at 5:30AM Jul 31, 2014Observed: 2.79 ft at 5:45AM Jul 31, 2014Observed: 2.79 ft at 6:00AM Jul 31, 2014Observed: 2.79 ft at 6:15AM Jul 31, 2014Observed: 2.79 ft at 6:30AM Jul 31, 2014Observed: 2.79 ft at 6:45AM Jul 31, 2014Observed: 2.79 ft at 7:00AM Jul 31, 2014Observed: 2.79 ft at 7:15AM Jul 31, 2014Observed: 2.79 ft at 7:30AM Jul 31, 2014Observed: 2.79 ft at 7:45AM Jul 31, 2014Observed: 2.79 ft at 8:00AM Jul 31, 2014Highest Observation: 2.8 ft at 8:15AM Jul 31, 2014Highest Observation: 2.8 ft at 8:30AM Jul 31, 2014Highest Observation: 2.8 ft at 8:45AM Jul 31, 2014Highest Observation: 2.8 ft at 9:00AM Jul 31, 2014Highest Observation: 2.8 ft at 9:15AM Jul 31, 2014Highest Observation: 2.8 ft at 9:30AM Jul 31, 2014Highest Observation: 2.8 ft at 9:45AM Jul 31, 2014Highest Observation: 2.8 ft at 10:00AM Jul 31, 2014Highest Observation: 2.8 ft at 10:15AM Jul 31, 2014Highest Observation: 2.8 ft at 10:30AM Jul 31, 2014Highest Forecast: 2.8 ft 2:00PM Jul 31, 2014Highest Forecast: 2.8 ft 8:00PM Jul 31, 2014Highest Forecast: 2.8 ft 2:00AM Aug 01, 2014Highest Forecast: 2.8 ft 8:00AM Aug 01, 2014Highest Forecast: 2.8 ft 2:00PM Aug 01, 2014Highest Forecast: 2.8 ft 8:00PM Aug 01, 2014Highest Forecast: 2.8 ft 2:00AM Aug 02, 2014Highest Forecast: 2.8 ft 8:00AM Aug 02, 2014Highest Forecast: 2.8 ft 2:00PM Aug 02, 2014Highest Forecast: 2.8 ft 8:00PM Aug 02, 2014Forecast: 2.7 ft 2:00AM Aug 03, 2014Forecast: 2.7 ft 8:00AM Aug 03, 2014USGS--Water Resources of the United StatesSOHN3(plotting HGIRG) Graph Created (11:31AM Jul 31, 2014)ObservedForecast (issued 11:07AM Jul 31)Latest observed value: 2.8 ft at 10:30 AM EDT 31-Jul-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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Page last modified: 16-Jul-2014 2:08 AM
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