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Hydrograph River at a Glance Download
Merrimack River at Lowell Stage (ft)Flow (kcfs)Observed: 43.07 ft at 9:30AM Nov 24, 2014Observed: 43.07 ft at 9:45AM Nov 24, 2014Observed: 43.07 ft at 10:00AM Nov 24, 2014Observed: 43.08 ft at 10:15AM Nov 24, 2014Observed: 43.07 ft at 10:30AM Nov 24, 2014Observed: 43.08 ft at 10:45AM Nov 24, 2014Observed: 43.08 ft at 11:00AM Nov 24, 2014Observed: 43.08 ft at 11:15AM Nov 24, 2014Observed: 43.08 ft at 11:16AM Nov 24, 2014Observed: 43.08 ft at 11:30AM Nov 24, 2014Observed: 43.07 ft at 11:45AM Nov 24, 2014Observed: 43.07 ft at 12:00PM Nov 24, 2014Observed: 43.07 ft at 12:15PM Nov 24, 2014Observed: 43.07 ft at 12:45PM Nov 24, 2014Observed: 43.08 ft at 1:00PM Nov 24, 2014Observed: 43.09 ft at 1:15PM Nov 24, 2014Observed: 43.1 ft at 1:30PM Nov 24, 2014Observed: 43.1 ft at 1:45PM Nov 24, 2014Observed: 43.11 ft at 2:00PM Nov 24, 2014Observed: 43.13 ft at 2:15PM Nov 24, 2014Observed: 43.13 ft at 2:30PM Nov 24, 2014Observed: 43.13 ft at 2:45PM Nov 24, 2014Observed: 43.15 ft at 3:00PM Nov 24, 2014Observed: 43.15 ft at 3:15PM Nov 24, 2014Observed: 43.15 ft at 3:30PM Nov 24, 2014Observed: 43.15 ft at 3:45PM Nov 24, 2014Observed: 43.15 ft at 4:00PM Nov 24, 2014Observed: 43.15 ft at 4:15PM Nov 24, 2014Observed: 43.17 ft at 4:45PM Nov 24, 2014Observed: 43.18 ft at 5:00PM Nov 24, 2014Observed: 43.19 ft at 5:15PM Nov 24, 2014Observed: 43.19 ft at 5:16PM Nov 24, 2014Observed: 43.21 ft at 5:30PM Nov 24, 2014Observed: 43.21 ft at 5:45PM Nov 24, 2014Observed: 43.22 ft at 6:00PM Nov 24, 2014Observed: 43.22 ft at 6:15PM Nov 24, 2014Observed: 43.23 ft at 6:30PM Nov 24, 2014Observed: 43.24 ft at 7:00PM Nov 24, 2014Observed: 43.24 ft at 7:15PM Nov 24, 2014Observed: 43.24 ft at 7:30PM Nov 24, 2014Observed: 43.24 ft at 7:45PM Nov 24, 2014Observed: 43.24 ft at 8:00PM Nov 24, 2014Observed: 43.24 ft at 8:15PM Nov 24, 2014Observed: 43.24 ft at 8:30PM Nov 24, 2014Observed: 43.24 ft at 8:45PM Nov 24, 2014Observed: 43.24 ft at 9:00PM Nov 24, 2014Observed: 43.24 ft at 9:15PM Nov 24, 2014Observed: 43.24 ft at 9:30PM Nov 24, 2014Observed: 43.24 ft at 9:45PM Nov 24, 2014Observed: 43.24 ft at 10:00PM Nov 24, 2014Observed: 43.24 ft at 10:15PM Nov 24, 2014Observed: 43.24 ft at 10:30PM Nov 24, 2014Observed: 43.24 ft at 10:45PM Nov 24, 2014Observed: 43.24 ft at 11:00PM Nov 24, 2014Observed: 43.24 ft at 11:15PM Nov 24, 2014Observed: 43.24 ft at 11:16PM Nov 24, 2014Observed: 43.24 ft at 11:30PM Nov 24, 2014Observed: 43.24 ft at 11:45PM Nov 24, 2014Observed: 43.24 ft at 12:00AM Nov 25, 2014Observed: 43.24 ft at 12:15AM Nov 25, 2014Observed: 43.25 ft at 12:30AM Nov 25, 2014Observed: 43.25 ft at 12:45AM Nov 25, 2014Observed: 43.25 ft at 1:00AM Nov 25, 2014Observed: 43.26 ft at 1:15AM Nov 25, 2014Observed: 43.28 ft at 1:30AM Nov 25, 2014Observed: 43.29 ft at 2:00AM Nov 25, 2014Observed: 43.3 ft at 2:15AM Nov 25, 2014Observed: 43.31 ft at 2:30AM Nov 25, 2014Observed: 43.31 ft at 2:45AM Nov 25, 2014Observed: 43.32 ft at 3:00AM Nov 25, 2014Observed: 43.32 ft at 3:15AM Nov 25, 2014Observed: 43.32 ft at 3:45AM Nov 25, 2014Observed: 43.32 ft at 4:00AM Nov 25, 2014Observed: 43.31 ft at 4:15AM Nov 25, 2014Observed: 43.32 ft at 4:30AM Nov 25, 2014Observed: 43.32 ft at 4:45AM Nov 25, 2014Observed: 43.31 ft at 5:00AM Nov 25, 2014Observed: 43.32 ft at 5:15AM Nov 25, 2014Observed: 43.32 ft at 5:16AM Nov 25, 2014Observed: 43.31 ft at 5:30AM Nov 25, 2014Observed: 43.31 ft at 5:45AM Nov 25, 2014Observed: 43.31 ft at 6:00AM Nov 25, 2014Observed: 43.31 ft at 6:15AM Nov 25, 2014Observed: 43.31 ft at 6:30AM Nov 25, 2014Observed: 43.32 ft at 7:00AM Nov 25, 2014Observed: 43.33 ft at 7:15AM Nov 25, 2014Observed: 43.34 ft at 7:30AM Nov 25, 2014Observed: 43.35 ft at 7:45AM Nov 25, 2014Observed: 43.37 ft at 8:00AM Nov 25, 2014Observed: 43.38 ft at 8:15AM Nov 25, 2014Observed: 43.39 ft at 8:30AM Nov 25, 2014Observed: 43.41 ft at 8:45AM Nov 25, 2014Observed: 43.42 ft at 9:00AM Nov 25, 2014Observed: 43.43 ft at 9:15AM Nov 25, 2014Observed: 43.44 ft at 9:30AM Nov 25, 2014Observed: 43.45 ft at 9:45AM Nov 25, 2014Observed: 43.46 ft at 10:00AM Nov 25, 2014Observed: 43.46 ft at 10:15AM Nov 25, 2014Observed: 43.46 ft at 10:30AM Nov 25, 2014Observed: 43.47 ft at 10:45AM Nov 25, 2014Observed: 43.47 ft at 11:00AM Nov 25, 2014Observed: 43.47 ft at 11:15AM Nov 25, 2014Observed: 43.47 ft at 11:30AM Nov 25, 2014Observed: 43.47 ft at 11:31AM Nov 25, 2014Observed: 43.47 ft at 11:45AM Nov 25, 2014Observed: 43.54 ft at 12:00PM Nov 25, 2014Observed: 43.63 ft at 12:15PM Nov 25, 2014Observed: 43.65 ft at 12:30PM Nov 25, 2014Observed: 43.62 ft at 12:45PM Nov 25, 2014Observed: 43.5 ft at 1:00PM Nov 25, 2014Observed: 43.36 ft at 1:15PM Nov 25, 2014Observed: 43.29 ft at 1:30PM Nov 25, 2014Observed: 43.26 ft at 1:45PM Nov 25, 2014Observed: 43.27 ft at 2:00PM Nov 25, 2014Observed: 43.35 ft at 2:15PM Nov 25, 2014Observed: 43.48 ft at 2:30PM Nov 25, 2014Observed: 43.58 ft at 2:45PM Nov 25, 2014Observed: 43.69 ft at 3:15PM Nov 25, 2014Observed: 43.69 ft at 3:30PM Nov 25, 2014Observed: 43.69 ft at 3:45PM Nov 25, 2014Observed: 43.69 ft at 4:00PM Nov 25, 2014Observed: 43.69 ft at 4:15PM Nov 25, 2014Observed: 43.69 ft at 4:30PM Nov 25, 2014Observed: 43.68 ft at 4:45PM Nov 25, 2014Observed: 43.68 ft at 5:00PM Nov 25, 2014Observed: 43.68 ft at 5:15PM Nov 25, 2014Observed: 43.68 ft at 5:30PM Nov 25, 2014Observed: 43.68 ft at 5:45PM Nov 25, 2014Observed: 43.69 ft at 6:00PM Nov 25, 2014Observed: 43.68 ft at 6:15PM Nov 25, 2014Observed: 43.69 ft at 6:45PM Nov 25, 2014Observed: 43.69 ft at 7:00PM Nov 25, 2014Observed: 43.69 ft at 7:15PM Nov 25, 2014Observed: 43.69 ft at 7:30PM Nov 25, 2014Observed: 43.69 ft at 7:45PM Nov 25, 2014Observed: 43.69 ft at 8:00PM Nov 25, 2014Observed: 43.69 ft at 8:15PM Nov 25, 2014Observed: 43.69 ft at 8:30PM Nov 25, 2014Observed: 43.7 ft at 8:45PM Nov 25, 2014Observed: 43.7 ft at 9:00PM Nov 25, 2014Observed: 43.7 ft at 9:15PM Nov 25, 2014Observed: 43.7 ft at 9:30PM Nov 25, 2014Observed: 43.7 ft at 9:45PM Nov 25, 2014Observed: 43.7 ft at 10:00PM Nov 25, 2014Observed: 43.7 ft at 10:15PM Nov 25, 2014Observed: 43.71 ft at 10:30PM Nov 25, 2014Observed: 43.71 ft at 10:45PM Nov 25, 2014Observed: 43.71 ft at 11:00PM Nov 25, 2014Observed: 43.72 ft at 11:15PM Nov 25, 2014Observed: 43.72 ft at 11:30PM Nov 25, 2014Observed: 43.72 ft at 11:31PM Nov 25, 2014Observed: 43.73 ft at 11:45PM Nov 25, 2014Observed: 43.74 ft at 12:00AM Nov 26, 2014Observed: 43.74 ft at 12:15AM Nov 26, 2014Observed: 43.75 ft at 12:30AM Nov 26, 2014Observed: 43.76 ft at 12:45AM Nov 26, 2014Observed: 43.77 ft at 1:00AM Nov 26, 2014Observed: 43.78 ft at 1:15AM Nov 26, 2014Observed: 43.79 ft at 1:30AM Nov 26, 2014Observed: 43.8 ft at 1:45AM Nov 26, 2014Observed: 43.81 ft at 2:00AM Nov 26, 2014Observed: 43.82 ft at 2:15AM Nov 26, 2014Observed: 43.83 ft at 2:30AM Nov 26, 2014Observed: 43.84 ft at 2:45AM Nov 26, 2014Observed: 43.85 ft at 3:00AM Nov 26, 2014Observed: 43.86 ft at 3:30AM Nov 26, 2014Observed: 43.87 ft at 3:45AM Nov 26, 2014Observed: 43.88 ft at 4:00AM Nov 26, 2014Observed: 43.89 ft at 4:15AM Nov 26, 2014Observed: 43.9 ft at 4:30AM Nov 26, 2014Observed: 43.91 ft at 4:45AM Nov 26, 2014Observed: 43.92 ft at 5:00AM Nov 26, 2014Observed: 43.93 ft at 5:15AM Nov 26, 2014Observed: 43.94 ft at 5:30AM Nov 26, 2014Observed: 43.94 ft at 5:31AM Nov 26, 2014Observed: 43.95 ft at 5:45AM Nov 26, 2014Observed: 43.97 ft at 6:00AM Nov 26, 2014Observed: 43.98 ft at 6:15AM Nov 26, 2014Observed: 44 ft at 6:30AM Nov 26, 2014Observed: 44.01 ft at 6:45AM Nov 26, 2014Observed: 44.04 ft at 7:15AM Nov 26, 2014Observed: 44.05 ft at 7:30AM Nov 26, 2014Observed: 44.06 ft at 7:45AM Nov 26, 2014Observed: 44.08 ft at 8:00AM Nov 26, 2014Observed: 44.09 ft at 8:15AM Nov 26, 2014Observed: 44.1 ft at 8:30AM Nov 26, 2014Observed: 44.12 ft at 9:00AM Nov 26, 2014Observed: 44.13 ft at 9:15AM Nov 26, 2014Observed: 44.19 ft at 9:30AM Nov 26, 2014Observed: 44.27 ft at 9:45AM Nov 26, 2014Observed: 44.3 ft at 10:00AM Nov 26, 2014Observed: 44.31 ft at 10:15AM Nov 26, 2014Observed: 44.3 ft at 10:30AM Nov 26, 2014Observed: 44.29 ft at 11:00AM Nov 26, 2014Observed: 44.29 ft at 11:15AM Nov 26, 2014Observed: 44.29 ft at 11:30AM Nov 26, 2014Observed: 44.29 ft at 11:31AM Nov 26, 2014Observed: 44.29 ft at 11:45AM Nov 26, 2014Observed: 44.29 ft at 12:00PM Nov 26, 2014Observed: 44.28 ft at 12:15PM Nov 26, 2014Observed: 44.28 ft at 12:30PM Nov 26, 2014Observed: 44.28 ft at 12:45PM Nov 26, 2014Observed: 44.28 ft at 1:00PM Nov 26, 2014Observed: 44.28 ft at 1:15PM Nov 26, 2014Observed: 44.28 ft at 1:30PM Nov 26, 2014Observed: 44.28 ft at 1:45PM Nov 26, 2014Observed: 44.29 ft at 2:00PM Nov 26, 2014Observed: 44.29 ft at 2:15PM Nov 26, 2014Observed: 44.29 ft at 2:30PM Nov 26, 2014Observed: 44.29 ft at 2:45PM Nov 26, 2014Observed: 44.29 ft at 3:00PM Nov 26, 2014Observed: 44.22 ft at 3:15PM Nov 26, 2014Observed: 44.15 ft at 3:30PM Nov 26, 2014Observed: 44.1 ft at 3:45PM Nov 26, 2014Observed: 44.09 ft at 4:00PM Nov 26, 2014Observed: 44.21 ft at 4:15PM Nov 26, 2014Observed: 44.31 ft at 4:30PM Nov 26, 2014Observed: 44.35 ft at 4:45PM Nov 26, 2014Highest Observation: 44.36 ft at 5:00PM Nov 26, 2014Highest Observation: 44.36 ft at 5:30PM Nov 26, 2014Highest Observation: 44.36 ft at 5:45PM Nov 26, 2014Observed: 44.35 ft at 6:00PM Nov 26, 2014Highest Observation: 44.36 ft at 6:15PM Nov 26, 2014Observed: 44.35 ft at 6:30PM Nov 26, 2014Observed: 44.34 ft at 6:45PM Nov 26, 2014Observed: 44.34 ft at 7:00PM Nov 26, 2014Observed: 44.33 ft at 7:15PM Nov 26, 2014Observed: 44.34 ft at 7:30PM Nov 26, 2014Observed: 44.33 ft at 7:45PM Nov 26, 2014Observed: 44.32 ft at 8:00PM Nov 26, 2014Observed: 44.31 ft at 8:15PM Nov 26, 2014Observed: 44.31 ft at 8:30PM Nov 26, 2014Observed: 44.3 ft at 8:45PM Nov 26, 2014Observed: 44.3 ft at 9:00PM Nov 26, 2014Observed: 44.29 ft at 9:15PM Nov 26, 2014Observed: 44.28 ft at 9:30PM Nov 26, 2014Observed: 44.27 ft at 9:45PM Nov 26, 2014Observed: 44.27 ft at 10:00PM Nov 26, 2014Observed: 44.26 ft at 10:15PM Nov 26, 2014Observed: 44.26 ft at 10:30PM Nov 26, 2014Observed: 44.25 ft at 10:45PM Nov 26, 2014Observed: 44.25 ft at 11:00PM Nov 26, 2014Observed: 44.24 ft at 11:15PM Nov 26, 2014Observed: 44.23 ft at 11:30PM Nov 26, 2014Observed: 44.23 ft at 11:45PM Nov 26, 2014Observed: 44.23 ft at 12:00AM Nov 27, 2014Observed: 44.22 ft at 12:15AM Nov 27, 2014Observed: 44.21 ft at 12:30AM Nov 27, 2014Observed: 44.21 ft at 12:45AM Nov 27, 2014Observed: 44.2 ft at 1:00AM Nov 27, 2014Observed: 44.2 ft at 1:15AM Nov 27, 2014Observed: 44.2 ft at 1:30AM Nov 27, 2014Observed: 44.19 ft at 1:45AM Nov 27, 2014Observed: 44.19 ft at 2:00AM Nov 27, 2014Observed: 44.19 ft at 2:15AM Nov 27, 2014Observed: 44.18 ft at 2:30AM Nov 27, 2014Observed: 44.18 ft at 2:45AM Nov 27, 2014Observed: 44.17 ft at 3:00AM Nov 27, 2014Observed: 44.17 ft at 3:15AM Nov 27, 2014Observed: 44.16 ft at 3:45AM Nov 27, 2014Observed: 44.15 ft at 4:00AM Nov 27, 2014Observed: 44.15 ft at 4:15AM Nov 27, 2014Observed: 44.15 ft at 4:30AM Nov 27, 2014Observed: 44.15 ft at 4:45AM Nov 27, 2014Observed: 44.14 ft at 5:00AM Nov 27, 2014Observed: 44.14 ft at 5:15AM Nov 27, 2014Observed: 44.14 ft at 5:30AM Nov 27, 2014Observed: 44.14 ft at 5:45AM Nov 27, 2014Observed: 44.13 ft at 6:00AM Nov 27, 2014Observed: 44.13 ft at 6:15AM Nov 27, 2014Observed: 44.13 ft at 6:30AM Nov 27, 2014Observed: 44.12 ft at 6:45AM Nov 27, 2014Observed: 44.12 ft at 7:00AM Nov 27, 2014Observed: 44.12 ft at 7:15AM Nov 27, 2014Observed: 44.12 ft at 7:30AM Nov 27, 2014Observed: 44.11 ft at 7:45AM Nov 27, 2014Observed: 44.11 ft at 8:00AM Nov 27, 2014Observed: 44.12 ft at 8:15AM Nov 27, 2014Observed: 44.11 ft at 8:30AM Nov 27, 2014Highest Forecast: 44.2 ft 1:00PM Nov 27, 2014Highest Forecast: 44.2 ft 7:00PM Nov 27, 2014Forecast: 44.1 ft 1:00AM Nov 28, 2014Forecast: 44.1 ft 7:00AM Nov 28, 2014Forecast: 44 ft 1:00PM Nov 28, 2014Forecast: 44 ft 7:00PM Nov 28, 2014Forecast: 43.9 ft 1:00AM Nov 29, 2014Forecast: 43.9 ft 7:00AM Nov 29, 2014USGS--Water Resources of the United StatesLOWM3(plotting HGIRG) Graph Created (9:15AM Nov 27, 2014)ObservedForecast (issued 11:39AM Nov 26)Latest observed value: 44.11 ft at 8:30 AM EST 27-Nov-2014. Flood Stage is 52 ft
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About this graph
Tabular Data (UTC)
Tabular Data (EST)
XML Data
RSS Files
Datum: Not Available
Metadata
NOTE: Forecasts for the Merrimack River at Lowell are issued routinely year-round.
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Upstream Gauge - at Nashua Upstream Gauge Downstream Gauge Downstream Gauge - at Lawrence
Flood Categories (in feet)
Major Flood Stage: 58
Moderate Flood Stage: 54
Flood Stage: 52
Action Stage: 50
Low Stage (in feet): 0

Historic Crests
(1) 68.40 ft on 03/20/1936
(2) 60.60 ft on 04/23/1852
(3) 60.57 ft on 09/23/1938
(4) 58.84 ft on 05/15/2006
(5) 58.09 ft on 04/17/2007
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 54.64 ft on 04/01/2010
(2) 53.63 ft on 03/16/2010
(3) 58.09 ft on 04/17/2007
(4) 58.84 ft on 05/15/2006
(5) 52.77 ft on 04/04/2005
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
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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
65 This is a serious flood event. All persons along the Merrimack River should follow the evacuation recommendations from your local emergency managemant officials. If asked to evacuate, do so immediately. All flood protection measures must be rushed to completion in flood prone areas.
62 This is a serious flood event. All persons along the Merrimack River should follow the evacuation recommendations from your local emergency managemant officials. If asked to evacuate, do so immediately. All flood protection measures must be rushed to completion in flood prone areas.
60 This is a serious flood event. All persons along the Merrimack River from the Massachusetts border through Methuen should follow the evacuation recommendations from your local emergency managemant officials. If asked to evacuate, do so immediately. All flood protection measures must be rushed to completion in flood prone areas.
58 Flooding is expected to overspread portions of Route 113 above Pawtucket Falls. Also, portions of Route 110 and several homes and businesses along Route 110 heading north and east into Tewksbury may begin to experience flooding. Follow the direction of your local emergency management officals. If asked to evacuate, do so immediately.
56 Flooding will become more widespread from the New Hampshire border through Methuen. Those areas outside local flood protection should take measures to protect property. Follow the directions of your local emergency management agency.
55 Flooding will become more widespread from the New Hampshire border through Methuen. Those areas outside local flood protection should take measures to protect property. Follow the directions of your local emergency management agency.
52 Lowland flooding is likely along the Merrimack River. Most of the impact will be felt by businesses and mills where basement flooding is likely.
About This Location Collapse

Latitude: 42.645833° N, Longitude: 71.298889° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 52 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: 20-Nov-2014 2:01 AM
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