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Hydrograph River at a Glance Download
Souhegan River at Merrimack Stage (ft)Flow (kcfs)Highest Observation: 3.55 ft at 7:00AM Dec 05, 2016Highest Observation: 3.55 ft at 7:15AM Dec 05, 2016Highest Observation: 3.55 ft at 7:30AM Dec 05, 2016Highest Observation: 3.55 ft at 7:45AM Dec 05, 2016Highest Observation: 3.55 ft at 8:00AM Dec 05, 2016Highest Observation: 3.55 ft at 8:15AM Dec 05, 2016Highest Observation: 3.55 ft at 8:30AM Dec 05, 2016Highest Observation: 3.55 ft at 8:45AM Dec 05, 2016Highest Observation: 3.55 ft at 9:00AM Dec 05, 2016Observed: 3.54 ft at 9:15AM Dec 05, 2016Observed: 3.54 ft at 9:30AM Dec 05, 2016Observed: 3.54 ft at 9:45AM Dec 05, 2016Observed: 3.54 ft at 10:00AM Dec 05, 2016Observed: 3.54 ft at 10:15AM Dec 05, 2016Observed: 3.54 ft at 10:30AM Dec 05, 2016Observed: 3.54 ft at 10:45AM Dec 05, 2016Observed: 3.54 ft at 11:00AM Dec 05, 2016Observed: 3.54 ft at 11:15AM Dec 05, 2016Observed: 3.54 ft at 11:30AM Dec 05, 2016Observed: 3.54 ft at 11:45AM Dec 05, 2016Observed: 3.54 ft at 12:00PM Dec 05, 2016Observed: 3.54 ft at 12:15PM Dec 05, 2016Observed: 3.54 ft at 12:30PM Dec 05, 2016Observed: 3.54 ft at 12:45PM Dec 05, 2016Observed: 3.54 ft at 12:46PM Dec 05, 2016Observed: 3.54 ft at 1:00PM Dec 05, 2016Observed: 3.53 ft at 1:15PM Dec 05, 2016Observed: 3.53 ft at 1:30PM Dec 05, 2016Observed: 3.53 ft at 1:45PM Dec 05, 2016Observed: 3.53 ft at 2:00PM Dec 05, 2016Observed: 3.53 ft at 2:15PM Dec 05, 2016Observed: 3.53 ft at 2:30PM Dec 05, 2016Observed: 3.53 ft at 2:45PM Dec 05, 2016Observed: 3.53 ft at 3:00PM Dec 05, 2016Observed: 3.53 ft at 3:15PM Dec 05, 2016Observed: 3.53 ft at 3:30PM Dec 05, 2016Observed: 3.53 ft at 3:45PM Dec 05, 2016Observed: 3.52 ft at 4:00PM Dec 05, 2016Observed: 3.52 ft at 4:15PM Dec 05, 2016Observed: 3.52 ft at 4:30PM Dec 05, 2016Observed: 3.52 ft at 4:45PM Dec 05, 2016Observed: 3.52 ft at 5:00PM Dec 05, 2016Observed: 3.52 ft at 5:15PM Dec 05, 2016Observed: 3.51 ft at 5:30PM Dec 05, 2016Observed: 3.51 ft at 5:45PM Dec 05, 2016Observed: 3.5 ft at 6:00PM Dec 05, 2016Observed: 3.5 ft at 6:15PM Dec 05, 2016Observed: 3.5 ft at 6:30PM Dec 05, 2016Observed: 3.49 ft at 6:45PM Dec 05, 2016Observed: 3.49 ft at 6:46PM Dec 05, 2016Observed: 3.49 ft at 7:00PM Dec 05, 2016Observed: 3.48 ft at 7:15PM Dec 05, 2016Observed: 3.48 ft at 7:30PM Dec 05, 2016Observed: 3.48 ft at 7:45PM Dec 05, 2016Observed: 3.47 ft at 8:00PM Dec 05, 2016Observed: 3.47 ft at 8:15PM Dec 05, 2016Observed: 3.47 ft at 8:30PM Dec 05, 2016Observed: 3.46 ft at 8:45PM Dec 05, 2016Observed: 3.46 ft at 9:00PM Dec 05, 2016Observed: 3.46 ft at 9:15PM Dec 05, 2016Observed: 3.46 ft at 9:30PM Dec 05, 2016Observed: 3.45 ft at 9:45PM Dec 05, 2016Observed: 3.45 ft at 10:00PM Dec 05, 2016Observed: 3.45 ft at 10:15PM Dec 05, 2016Observed: 3.45 ft at 10:30PM Dec 05, 2016Observed: 3.45 ft at 10:45PM Dec 05, 2016Observed: 3.45 ft at 11:00PM Dec 05, 2016Observed: 3.45 ft at 11:15PM Dec 05, 2016Observed: 3.45 ft at 11:30PM Dec 05, 2016Observed: 3.45 ft at 11:45PM Dec 05, 2016Observed: 3.45 ft at 12:00AM Dec 06, 2016Observed: 3.44 ft at 12:15AM Dec 06, 2016Observed: 3.44 ft at 12:30AM Dec 06, 2016Observed: 3.44 ft at 12:45AM Dec 06, 2016Observed: 3.44 ft at 1:00AM Dec 06, 2016Observed: 3.44 ft at 1:15AM Dec 06, 2016Observed: 3.44 ft at 1:30AM Dec 06, 2016Observed: 3.44 ft at 1:45AM Dec 06, 2016Observed: 3.44 ft at 2:00AM Dec 06, 2016Observed: 3.44 ft at 2:15AM Dec 06, 2016Observed: 3.44 ft at 2:30AM Dec 06, 2016Observed: 3.44 ft at 2:45AM Dec 06, 2016Observed: 3.43 ft at 3:00AM Dec 06, 2016Observed: 3.43 ft at 3:15AM Dec 06, 2016Observed: 3.43 ft at 3:30AM Dec 06, 2016Observed: 3.42 ft at 3:45AM Dec 06, 2016Observed: 3.42 ft at 4:00AM Dec 06, 2016Observed: 3.42 ft at 4:15AM Dec 06, 2016Observed: 3.42 ft at 4:30AM Dec 06, 2016Observed: 3.41 ft at 4:45AM Dec 06, 2016Observed: 3.41 ft at 5:00AM Dec 06, 2016Observed: 3.4 ft at 5:15AM Dec 06, 2016Observed: 3.4 ft at 5:30AM Dec 06, 2016Observed: 3.4 ft at 5:45AM Dec 06, 2016Observed: 3.39 ft at 6:00AM Dec 06, 2016Observed: 3.39 ft at 6:15AM Dec 06, 2016Observed: 3.38 ft at 6:30AM Dec 06, 2016Observed: 3.38 ft at 6:45AM Dec 06, 2016Observed: 3.37 ft at 7:00AM Dec 06, 2016Observed: 3.37 ft at 7:15AM Dec 06, 2016Observed: 3.36 ft at 7:30AM Dec 06, 2016Observed: 3.36 ft at 7:45AM Dec 06, 2016Observed: 3.35 ft at 8:00AM Dec 06, 2016Observed: 3.34 ft at 8:15AM Dec 06, 2016Observed: 3.34 ft at 8:30AM Dec 06, 2016Observed: 3.33 ft at 8:45AM Dec 06, 2016Observed: 3.33 ft at 9:00AM Dec 06, 2016Observed: 3.32 ft at 9:15AM Dec 06, 2016Observed: 3.32 ft at 9:30AM Dec 06, 2016Observed: 3.31 ft at 9:45AM Dec 06, 2016Observed: 3.31 ft at 10:00AM Dec 06, 2016Observed: 3.3 ft at 10:15AM Dec 06, 2016Observed: 3.3 ft at 10:30AM Dec 06, 2016Observed: 3.29 ft at 10:45AM Dec 06, 2016Observed: 3.29 ft at 11:00AM Dec 06, 2016Observed: 3.28 ft at 11:15AM Dec 06, 2016Observed: 3.28 ft at 11:30AM Dec 06, 2016Observed: 3.27 ft at 11:45AM Dec 06, 2016Observed: 3.27 ft at 12:00PM Dec 06, 2016Observed: 3.26 ft at 12:15PM Dec 06, 2016Observed: 3.26 ft at 12:30PM Dec 06, 2016Observed: 3.26 ft at 12:45PM Dec 06, 2016Observed: 3.25 ft at 1:00PM Dec 06, 2016Observed: 3.25 ft at 1:01PM Dec 06, 2016Observed: 3.25 ft at 1:15PM Dec 06, 2016Observed: 3.24 ft at 1:30PM Dec 06, 2016Observed: 3.24 ft at 1:45PM Dec 06, 2016Observed: 3.24 ft at 2:00PM Dec 06, 2016Observed: 3.24 ft at 2:15PM Dec 06, 2016Observed: 3.23 ft at 2:30PM Dec 06, 2016Observed: 3.23 ft at 2:45PM Dec 06, 2016Observed: 3.22 ft at 3:00PM Dec 06, 2016Observed: 3.22 ft at 3:15PM Dec 06, 2016Observed: 3.22 ft at 3:30PM Dec 06, 2016Observed: 3.22 ft at 3:45PM Dec 06, 2016Observed: 3.21 ft at 4:00PM Dec 06, 2016Observed: 3.21 ft at 4:15PM Dec 06, 2016Observed: 3.21 ft at 4:30PM Dec 06, 2016Observed: 3.21 ft at 4:45PM Dec 06, 2016Observed: 3.21 ft at 5:00PM Dec 06, 2016Observed: 3.2 ft at 5:15PM Dec 06, 2016Observed: 3.2 ft at 5:30PM Dec 06, 2016Observed: 3.2 ft at 5:45PM Dec 06, 2016Observed: 3.2 ft at 6:00PM Dec 06, 2016Observed: 3.2 ft at 6:15PM Dec 06, 2016Observed: 3.19 ft at 6:30PM Dec 06, 2016Observed: 3.19 ft at 6:45PM Dec 06, 2016Observed: 3.19 ft at 7:00PM Dec 06, 2016Observed: 3.19 ft at 7:01PM Dec 06, 2016Observed: 3.19 ft at 7:15PM Dec 06, 2016Observed: 3.18 ft at 7:30PM Dec 06, 2016Observed: 3.18 ft at 7:45PM Dec 06, 2016Observed: 3.18 ft at 8:00PM Dec 06, 2016Observed: 3.18 ft at 8:15PM Dec 06, 2016Observed: 3.18 ft at 8:30PM Dec 06, 2016Observed: 3.18 ft at 8:45PM Dec 06, 2016Observed: 3.18 ft at 9:00PM Dec 06, 2016Observed: 3.17 ft at 9:15PM Dec 06, 2016Observed: 3.17 ft at 9:30PM Dec 06, 2016Observed: 3.17 ft at 9:45PM Dec 06, 2016Observed: 3.17 ft at 10:00PM Dec 06, 2016Observed: 3.17 ft at 10:15PM Dec 06, 2016Observed: 3.17 ft at 10:30PM Dec 06, 2016Observed: 3.16 ft at 10:45PM Dec 06, 2016Observed: 3.16 ft at 11:00PM Dec 06, 2016Observed: 3.16 ft at 11:15PM Dec 06, 2016Observed: 3.16 ft at 11:30PM Dec 06, 2016Observed: 3.16 ft at 11:45PM Dec 06, 2016Observed: 3.15 ft at 12:00AM Dec 07, 2016Observed: 3.15 ft at 12:15AM Dec 07, 2016Observed: 3.14 ft at 12:30AM Dec 07, 2016Observed: 3.14 ft at 12:45AM Dec 07, 2016Observed: 3.14 ft at 1:00AM Dec 07, 2016Observed: 3.13 ft at 1:15AM Dec 07, 2016Observed: 3.13 ft at 1:30AM Dec 07, 2016Observed: 3.12 ft at 1:45AM Dec 07, 2016Observed: 3.12 ft at 2:00AM Dec 07, 2016Observed: 3.11 ft at 2:15AM Dec 07, 2016Observed: 3.1 ft at 2:30AM Dec 07, 2016Observed: 3.1 ft at 2:45AM Dec 07, 2016Observed: 3.09 ft at 3:00AM Dec 07, 2016Observed: 3.08 ft at 3:15AM Dec 07, 2016Observed: 3.08 ft at 3:30AM Dec 07, 2016Observed: 3.07 ft at 3:45AM Dec 07, 2016Observed: 3.06 ft at 4:00AM Dec 07, 2016Observed: 3.06 ft at 4:15AM Dec 07, 2016Observed: 3.05 ft at 4:30AM Dec 07, 2016Observed: 3.04 ft at 4:45AM Dec 07, 2016Observed: 3.04 ft at 5:00AM Dec 07, 2016Observed: 3.03 ft at 5:15AM Dec 07, 2016Observed: 3.02 ft at 5:30AM Dec 07, 2016Observed: 3.02 ft at 5:45AM Dec 07, 2016Observed: 3.02 ft at 6:00AM Dec 07, 2016Observed: 3.01 ft at 6:15AM Dec 07, 2016Observed: 3.01 ft at 6:30AM Dec 07, 2016Observed: 3 ft at 6:45AM Dec 07, 2016Observed: 3 ft at 7:00AM Dec 07, 2016Observed: 2.99 ft at 7:15AM Dec 07, 2016Observed: 2.99 ft at 7:30AM Dec 07, 2016Observed: 2.99 ft at 7:45AM Dec 07, 2016Observed: 2.99 ft at 8:00AM Dec 07, 2016Observed: 2.99 ft at 8:15AM Dec 07, 2016Observed: 2.98 ft at 8:30AM Dec 07, 2016Observed: 2.98 ft at 8:45AM Dec 07, 2016Observed: 2.99 ft at 9:00AM Dec 07, 2016Observed: 2.99 ft at 9:15AM Dec 07, 2016Observed: 2.99 ft at 9:30AM Dec 07, 2016Observed: 2.99 ft at 9:45AM Dec 07, 2016Observed: 3 ft at 10:00AM Dec 07, 2016Observed: 3 ft at 10:15AM Dec 07, 2016Observed: 3 ft at 10:30AM Dec 07, 2016Observed: 3.01 ft at 10:45AM Dec 07, 2016Observed: 3.01 ft at 11:00AM Dec 07, 2016Observed: 3.01 ft at 11:15AM Dec 07, 2016Observed: 3.02 ft at 11:30AM Dec 07, 2016Observed: 3.02 ft at 11:45AM Dec 07, 2016Observed: 3.03 ft at 12:00PM Dec 07, 2016Observed: 3.03 ft at 12:15PM Dec 07, 2016Observed: 3.04 ft at 12:30PM Dec 07, 2016Observed: 3.04 ft at 12:45PM Dec 07, 2016Observed: 3.05 ft at 1:00PM Dec 07, 2016Observed: 3.05 ft at 1:01PM Dec 07, 2016Observed: 3.05 ft at 1:15PM Dec 07, 2016Observed: 3.05 ft at 1:30PM Dec 07, 2016Observed: 3.06 ft at 1:45PM Dec 07, 2016Observed: 3.06 ft at 2:00PM Dec 07, 2016Observed: 3.06 ft at 2:15PM Dec 07, 2016Observed: 3.07 ft at 2:30PM Dec 07, 2016Observed: 3.07 ft at 2:45PM Dec 07, 2016Observed: 3.08 ft at 3:00PM Dec 07, 2016Observed: 3.08 ft at 3:15PM Dec 07, 2016Observed: 3.08 ft at 3:30PM Dec 07, 2016Observed: 3.08 ft at 3:45PM Dec 07, 2016Observed: 3.08 ft at 4:00PM Dec 07, 2016Observed: 3.08 ft at 4:15PM Dec 07, 2016Observed: 3.08 ft at 4:30PM Dec 07, 2016Observed: 3.09 ft at 4:45PM Dec 07, 2016Observed: 3.09 ft at 5:00PM Dec 07, 2016Observed: 3.09 ft at 5:15PM Dec 07, 2016Observed: 3.09 ft at 5:30PM Dec 07, 2016Observed: 3.09 ft at 5:45PM Dec 07, 2016Observed: 3.1 ft at 6:00PM Dec 07, 2016Observed: 3.1 ft at 6:15PM Dec 07, 2016Observed: 3.1 ft at 6:30PM Dec 07, 2016Observed: 3.1 ft at 6:45PM Dec 07, 2016Observed: 3.1 ft at 7:00PM Dec 07, 2016Observed: 3.1 ft at 7:01PM Dec 07, 2016Observed: 3.11 ft at 7:15PM Dec 07, 2016Observed: 3.11 ft at 7:30PM Dec 07, 2016Observed: 3.12 ft at 7:45PM Dec 07, 2016Observed: 3.12 ft at 8:00PM Dec 07, 2016Observed: 3.13 ft at 8:15PM Dec 07, 2016Observed: 3.13 ft at 8:30PM Dec 07, 2016Observed: 3.14 ft at 8:45PM Dec 07, 2016Observed: 3.15 ft at 9:00PM Dec 07, 2016Observed: 3.16 ft at 9:15PM Dec 07, 2016Observed: 3.16 ft at 9:30PM Dec 07, 2016Observed: 3.17 ft at 9:45PM Dec 07, 2016Observed: 3.18 ft at 10:00PM Dec 07, 2016Observed: 3.18 ft at 10:15PM Dec 07, 2016Observed: 3.19 ft at 10:30PM Dec 07, 2016Observed: 3.2 ft at 10:45PM Dec 07, 2016Observed: 3.2 ft at 11:00PM Dec 07, 2016Observed: 3.21 ft at 11:15PM Dec 07, 2016Observed: 3.21 ft at 11:30PM Dec 07, 2016Observed: 3.21 ft at 11:45PM Dec 07, 2016Observed: 3.22 ft at 12:00AM Dec 08, 2016Observed: 3.22 ft at 12:15AM Dec 08, 2016Observed: 3.22 ft at 12:30AM Dec 08, 2016Observed: 3.22 ft at 12:45AM Dec 08, 2016Observed: 3.23 ft at 1:00AM Dec 08, 2016Observed: 3.23 ft at 1:15AM Dec 08, 2016Observed: 3.23 ft at 1:30AM Dec 08, 2016Observed: 3.23 ft at 1:45AM Dec 08, 2016Observed: 3.23 ft at 2:00AM Dec 08, 2016Observed: 3.23 ft at 2:15AM Dec 08, 2016Observed: 3.23 ft at 2:30AM Dec 08, 2016Observed: 3.23 ft at 2:45AM Dec 08, 2016Observed: 3.23 ft at 3:00AM Dec 08, 2016Observed: 3.22 ft at 3:15AM Dec 08, 2016Observed: 3.22 ft at 3:30AM Dec 08, 2016Observed: 3.22 ft at 3:45AM Dec 08, 2016Observed: 3.22 ft at 4:00AM Dec 08, 2016Observed: 3.22 ft at 4:15AM Dec 08, 2016Observed: 3.22 ft at 4:30AM Dec 08, 2016Observed: 3.22 ft at 4:45AM Dec 08, 2016Observed: 3.22 ft at 5:00AM Dec 08, 2016Observed: 3.22 ft at 5:15AM Dec 08, 2016Observed: 3.22 ft at 5:30AM Dec 08, 2016Highest Forecast: 3 ft 7:00AM Dec 08, 2016Highest Forecast: 3 ft 1:00PM Dec 08, 2016Highest Forecast: 3 ft 7:00PM Dec 08, 2016Highest Forecast: 3 ft 1:00AM Dec 09, 2016Highest Forecast: 3 ft 7:00AM Dec 09, 2016Highest Forecast: 3 ft 1:00PM Dec 09, 2016Highest Forecast: 3 ft 7:00PM Dec 09, 2016Highest Forecast: 3 ft 1:00AM Dec 10, 2016Highest Forecast: 3 ft 7:00AM Dec 10, 2016USGS--Water Resources of the United StatesSOHN3(plotting HGIRG) Graph Created (6:50AM Dec 8, 2016)ObservedForecast (issued 11:13AM Dec 7)Latest observed value: 3.22 ft at 5:30 AM EST 8-Dec-2016. Flood Stage is 9 ft
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About this graph
Tabular Data (UTC)
Tabular Data (EST)
XML Data
RSS Files
Datum: Not Available
Metadata
NOTE: Gauge reading may be affected by ice. Forecast flows are unadjusted for ice.

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
Low Stage (in feet): -9999

Historic 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 Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 9.19 ft on 03/31/2010
(2) 9.85 ft on 03/15/2010
(3) 12.71 ft on 04/17/2007
(4) 9.88 ft on 05/15/2006
(5) 9.84 ft on 04/02/2004
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.

For more information on your flood risk go to www.floodsmart.gov.

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: 42.857586° N, Longitude: 71.506200° 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.
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Page last modified: 13-Aug-2015 1:57 AM
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