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Hydrograph River at a Glance Download
Merrimack River at Lowell Stage (ft)Flow (kcfs)Highest Observation: 48.29 ft at 9:45AM Apr 24, 2015Observed: 48.28 ft at 10:00AM Apr 24, 2015Observed: 48.27 ft at 10:15AM Apr 24, 2015Observed: 48.26 ft at 10:30AM Apr 24, 2015Observed: 48.25 ft at 10:45AM Apr 24, 2015Observed: 48.24 ft at 11:00AM Apr 24, 2015Observed: 48.22 ft at 11:15AM Apr 24, 2015Observed: 48.21 ft at 11:30AM Apr 24, 2015Observed: 48.2 ft at 11:45AM Apr 24, 2015Observed: 48.19 ft at 12:00PM Apr 24, 2015Observed: 48.17 ft at 12:15PM Apr 24, 2015Observed: 48.16 ft at 12:30PM Apr 24, 2015Observed: 48.15 ft at 12:45PM Apr 24, 2015Observed: 48.14 ft at 1:00PM Apr 24, 2015Observed: 48.12 ft at 1:15PM Apr 24, 2015Observed: 48.11 ft at 1:30PM Apr 24, 2015Observed: 48.1 ft at 1:45PM Apr 24, 2015Observed: 48.08 ft at 2:00PM Apr 24, 2015Observed: 48.07 ft at 2:15PM Apr 24, 2015Observed: 48.06 ft at 2:30PM Apr 24, 2015Observed: 48.05 ft at 2:45PM Apr 24, 2015Observed: 48.05 ft at 2:46PM Apr 24, 2015Observed: 48.03 ft at 3:00PM Apr 24, 2015Observed: 48.02 ft at 3:15PM Apr 24, 2015Observed: 48 ft at 3:30PM Apr 24, 2015Observed: 47.96 ft at 3:45PM Apr 24, 2015Observed: 47.92 ft at 4:00PM Apr 24, 2015Observed: 47.93 ft at 4:15PM Apr 24, 2015Observed: 47.96 ft at 4:30PM Apr 24, 2015Observed: 47.97 ft at 4:45PM Apr 24, 2015Observed: 47.98 ft at 5:00PM Apr 24, 2015Observed: 47.97 ft at 5:15PM Apr 24, 2015Observed: 47.96 ft at 5:30PM Apr 24, 2015Observed: 47.95 ft at 5:45PM Apr 24, 2015Observed: 47.94 ft at 6:00PM Apr 24, 2015Observed: 47.93 ft at 6:15PM Apr 24, 2015Observed: 47.92 ft at 6:30PM Apr 24, 2015Observed: 47.91 ft at 6:45PM Apr 24, 2015Observed: 47.9 ft at 7:00PM Apr 24, 2015Observed: 47.89 ft at 7:15PM Apr 24, 2015Observed: 47.88 ft at 7:30PM Apr 24, 2015Observed: 47.87 ft at 7:45PM Apr 24, 2015Observed: 47.86 ft at 8:00PM Apr 24, 2015Observed: 47.85 ft at 8:15PM Apr 24, 2015Observed: 47.84 ft at 8:30PM Apr 24, 2015Observed: 47.83 ft at 8:45PM Apr 24, 2015Observed: 47.82 ft at 9:00PM Apr 24, 2015Observed: 47.81 ft at 9:15PM Apr 24, 2015Observed: 47.8 ft at 9:30PM Apr 24, 2015Observed: 47.8 ft at 9:45PM Apr 24, 2015Observed: 47.79 ft at 10:00PM Apr 24, 2015Observed: 47.78 ft at 10:15PM Apr 24, 2015Observed: 47.77 ft at 10:30PM Apr 24, 2015Observed: 47.76 ft at 10:45PM Apr 24, 2015Observed: 47.75 ft at 11:00PM Apr 24, 2015Observed: 47.75 ft at 11:15PM Apr 24, 2015Observed: 47.74 ft at 11:30PM Apr 24, 2015Observed: 47.73 ft at 11:45PM Apr 24, 2015Observed: 47.72 ft at 12:00AM Apr 25, 2015Observed: 47.71 ft at 12:15AM Apr 25, 2015Observed: 47.71 ft at 12:30AM Apr 25, 2015Observed: 47.7 ft at 12:45AM Apr 25, 2015Observed: 47.69 ft at 1:00AM Apr 25, 2015Observed: 47.68 ft at 1:15AM Apr 25, 2015Observed: 47.68 ft at 1:30AM Apr 25, 2015Observed: 47.67 ft at 1:45AM Apr 25, 2015Observed: 47.66 ft at 2:00AM Apr 25, 2015Observed: 47.64 ft at 2:15AM Apr 25, 2015Observed: 47.64 ft at 2:30AM Apr 25, 2015Observed: 47.62 ft at 2:45AM Apr 25, 2015Observed: 47.61 ft at 3:00AM Apr 25, 2015Observed: 47.61 ft at 3:15AM Apr 25, 2015Observed: 47.6 ft at 3:30AM Apr 25, 2015Observed: 47.59 ft at 3:45AM Apr 25, 2015Observed: 47.58 ft at 4:00AM Apr 25, 2015Observed: 47.57 ft at 4:15AM Apr 25, 2015Observed: 47.56 ft at 4:30AM Apr 25, 2015Observed: 47.55 ft at 4:45AM Apr 25, 2015Observed: 47.54 ft at 5:00AM Apr 25, 2015Observed: 47.53 ft at 5:15AM Apr 25, 2015Observed: 47.53 ft at 5:30AM Apr 25, 2015Observed: 47.52 ft at 5:45AM Apr 25, 2015Observed: 47.51 ft at 6:00AM Apr 25, 2015Observed: 47.5 ft at 6:15AM Apr 25, 2015Observed: 47.49 ft at 6:30AM Apr 25, 2015Observed: 47.48 ft at 6:45AM Apr 25, 2015Observed: 47.47 ft at 7:00AM Apr 25, 2015Observed: 47.46 ft at 7:15AM Apr 25, 2015Observed: 47.45 ft at 7:30AM Apr 25, 2015Observed: 47.44 ft at 7:45AM Apr 25, 2015Observed: 47.43 ft at 8:00AM Apr 25, 2015Observed: 47.42 ft at 8:15AM Apr 25, 2015Observed: 47.4 ft at 8:30AM Apr 25, 2015Observed: 47.39 ft at 8:45AM Apr 25, 2015Observed: 47.38 ft at 9:00AM Apr 25, 2015Observed: 47.38 ft at 9:01AM Apr 25, 2015Observed: 47.38 ft at 9:15AM Apr 25, 2015Observed: 47.37 ft at 9:30AM Apr 25, 2015Observed: 47.36 ft at 9:45AM Apr 25, 2015Observed: 47.35 ft at 10:00AM Apr 25, 2015Observed: 47.35 ft at 10:15AM Apr 25, 2015Observed: 47.34 ft at 10:30AM Apr 25, 2015Observed: 47.33 ft at 10:45AM Apr 25, 2015Observed: 47.32 ft at 11:00AM Apr 25, 2015Observed: 47.31 ft at 11:15AM Apr 25, 2015Observed: 47.3 ft at 11:30AM Apr 25, 2015Observed: 47.29 ft at 11:45AM Apr 25, 2015Observed: 47.29 ft at 12:00PM Apr 25, 2015Observed: 47.28 ft at 12:15PM Apr 25, 2015Observed: 47.27 ft at 12:30PM Apr 25, 2015Observed: 47.26 ft at 12:45PM Apr 25, 2015Observed: 47.25 ft at 1:00PM Apr 25, 2015Observed: 47.24 ft at 1:15PM Apr 25, 2015Observed: 47.23 ft at 1:30PM Apr 25, 2015Observed: 47.23 ft at 1:45PM Apr 25, 2015Observed: 47.22 ft at 2:00PM Apr 25, 2015Observed: 47.21 ft at 2:15PM Apr 25, 2015Observed: 47.2 ft at 2:30PM Apr 25, 2015Observed: 47.19 ft at 2:45PM Apr 25, 2015Observed: 47.19 ft at 3:00PM Apr 25, 2015Observed: 47.18 ft at 3:15PM Apr 25, 2015Observed: 47.17 ft at 3:30PM Apr 25, 2015Observed: 47.17 ft at 3:45PM Apr 25, 2015Observed: 47.16 ft at 4:00PM Apr 25, 2015Observed: 47.15 ft at 4:15PM Apr 25, 2015Observed: 47.14 ft at 4:30PM Apr 25, 2015Observed: 47.13 ft at 4:45PM Apr 25, 2015Observed: 47.13 ft at 5:00PM Apr 25, 2015Observed: 47.12 ft at 5:15PM Apr 25, 2015Observed: 47.11 ft at 5:30PM Apr 25, 2015Observed: 47.1 ft at 5:45PM Apr 25, 2015Observed: 47.09 ft at 6:00PM Apr 25, 2015Observed: 47.08 ft at 6:15PM Apr 25, 2015Observed: 47.08 ft at 6:30PM Apr 25, 2015Observed: 47.07 ft at 6:45PM Apr 25, 2015Observed: 47.06 ft at 7:00PM Apr 25, 2015Observed: 47.05 ft at 7:15PM Apr 25, 2015Observed: 47.05 ft at 7:30PM Apr 25, 2015Observed: 47.04 ft at 7:45PM Apr 25, 2015Observed: 47.03 ft at 8:00PM Apr 25, 2015Observed: 47.03 ft at 8:15PM Apr 25, 2015Observed: 47.02 ft at 8:30PM Apr 25, 2015Observed: 47.01 ft at 8:45PM Apr 25, 2015Observed: 47.01 ft at 9:00PM Apr 25, 2015Observed: 47.01 ft at 9:01PM Apr 25, 2015Observed: 47 ft at 9:15PM Apr 25, 2015Observed: 46.99 ft at 9:30PM Apr 25, 2015Observed: 46.98 ft at 9:45PM Apr 25, 2015Observed: 46.98 ft at 10:00PM Apr 25, 2015Observed: 46.97 ft at 10:15PM Apr 25, 2015Observed: 46.96 ft at 10:30PM Apr 25, 2015Observed: 46.95 ft at 10:45PM Apr 25, 2015Observed: 46.95 ft at 11:00PM Apr 25, 2015Observed: 46.94 ft at 11:15PM Apr 25, 2015Observed: 46.93 ft at 11:30PM Apr 25, 2015Observed: 46.92 ft at 11:45PM Apr 25, 2015Observed: 46.92 ft at 12:00AM Apr 26, 2015Observed: 46.91 ft at 12:15AM Apr 26, 2015Observed: 46.9 ft at 12:30AM Apr 26, 2015Observed: 46.89 ft at 12:45AM Apr 26, 2015Observed: 46.88 ft at 1:00AM Apr 26, 2015Observed: 46.88 ft at 1:15AM Apr 26, 2015Observed: 46.87 ft at 1:30AM Apr 26, 2015Observed: 46.86 ft at 1:45AM Apr 26, 2015Observed: 46.85 ft at 2:00AM Apr 26, 2015Observed: 46.85 ft at 2:15AM Apr 26, 2015Observed: 46.84 ft at 2:30AM Apr 26, 2015Observed: 46.83 ft at 2:45AM Apr 26, 2015Observed: 46.82 ft at 3:00AM Apr 26, 2015Observed: 46.82 ft at 3:15AM Apr 26, 2015Observed: 46.81 ft at 3:30AM Apr 26, 2015Observed: 46.8 ft at 3:45AM Apr 26, 2015Observed: 46.8 ft at 4:00AM Apr 26, 2015Observed: 46.79 ft at 4:15AM Apr 26, 2015Observed: 46.79 ft at 4:30AM Apr 26, 2015Observed: 46.78 ft at 4:45AM Apr 26, 2015Observed: 46.78 ft at 5:00AM Apr 26, 2015Observed: 46.76 ft at 5:15AM Apr 26, 2015Observed: 46.75 ft at 5:30AM Apr 26, 2015Observed: 46.75 ft at 5:45AM Apr 26, 2015Observed: 46.74 ft at 6:00AM Apr 26, 2015Observed: 46.73 ft at 6:15AM Apr 26, 2015Observed: 46.72 ft at 6:30AM Apr 26, 2015Observed: 46.71 ft at 6:45AM Apr 26, 2015Observed: 46.7 ft at 7:00AM Apr 26, 2015Observed: 46.69 ft at 7:15AM Apr 26, 2015Observed: 46.69 ft at 7:30AM Apr 26, 2015Observed: 46.68 ft at 7:45AM Apr 26, 2015Observed: 46.67 ft at 8:00AM Apr 26, 2015Observed: 46.66 ft at 8:15AM Apr 26, 2015Observed: 46.66 ft at 8:30AM Apr 26, 2015Observed: 46.65 ft at 8:45AM Apr 26, 2015Observed: 46.64 ft at 9:00AM Apr 26, 2015Observed: 46.64 ft at 9:01AM Apr 26, 2015Observed: 46.63 ft at 9:15AM Apr 26, 2015Observed: 46.62 ft at 9:30AM Apr 26, 2015Observed: 46.61 ft at 9:45AM Apr 26, 2015Observed: 46.61 ft at 10:00AM Apr 26, 2015Observed: 46.6 ft at 10:15AM Apr 26, 2015Observed: 46.59 ft at 10:30AM Apr 26, 2015Observed: 46.59 ft at 10:45AM Apr 26, 2015Observed: 46.58 ft at 11:00AM Apr 26, 2015Observed: 46.57 ft at 11:15AM Apr 26, 2015Observed: 46.57 ft at 11:30AM Apr 26, 2015Observed: 46.56 ft at 11:45AM Apr 26, 2015Observed: 46.55 ft at 12:00PM Apr 26, 2015Observed: 46.54 ft at 12:15PM Apr 26, 2015Observed: 46.53 ft at 12:30PM Apr 26, 2015Observed: 46.53 ft at 12:45PM Apr 26, 2015Observed: 46.52 ft at 1:00PM Apr 26, 2015Observed: 46.51 ft at 1:15PM Apr 26, 2015Observed: 46.51 ft at 1:30PM Apr 26, 2015Observed: 46.5 ft at 1:45PM Apr 26, 2015Observed: 46.49 ft at 2:00PM Apr 26, 2015Observed: 46.49 ft at 2:15PM Apr 26, 2015Observed: 46.48 ft at 2:30PM Apr 26, 2015Observed: 46.47 ft at 2:45PM Apr 26, 2015Observed: 46.47 ft at 3:00PM Apr 26, 2015Observed: 46.47 ft at 3:01PM Apr 26, 2015Observed: 46.46 ft at 3:15PM Apr 26, 2015Observed: 46.46 ft at 3:30PM Apr 26, 2015Observed: 46.45 ft at 3:45PM Apr 26, 2015Observed: 46.45 ft at 4:00PM Apr 26, 2015Observed: 46.44 ft at 4:15PM Apr 26, 2015Observed: 46.43 ft at 4:30PM Apr 26, 2015Observed: 46.42 ft at 4:45PM Apr 26, 2015Observed: 46.42 ft at 5:00PM Apr 26, 2015Observed: 46.41 ft at 5:15PM Apr 26, 2015Observed: 46.4 ft at 5:30PM Apr 26, 2015Observed: 46.39 ft at 5:45PM Apr 26, 2015Observed: 46.39 ft at 6:00PM Apr 26, 2015Observed: 46.38 ft at 6:15PM Apr 26, 2015Observed: 46.37 ft at 6:30PM Apr 26, 2015Observed: 46.36 ft at 6:45PM Apr 26, 2015Observed: 46.35 ft at 7:00PM Apr 26, 2015Observed: 46.34 ft at 7:15PM Apr 26, 2015Observed: 46.33 ft at 7:30PM Apr 26, 2015Observed: 46.32 ft at 7:45PM Apr 26, 2015Observed: 46.31 ft at 8:00PM Apr 26, 2015Observed: 46.3 ft at 8:15PM Apr 26, 2015Observed: 46.29 ft at 8:30PM Apr 26, 2015Observed: 46.28 ft at 8:45PM Apr 26, 2015Observed: 46.27 ft at 9:00PM Apr 26, 2015Observed: 46.27 ft at 9:01PM Apr 26, 2015Observed: 46.26 ft at 9:15PM Apr 26, 2015Observed: 46.25 ft at 9:30PM Apr 26, 2015Observed: 46.24 ft at 9:45PM Apr 26, 2015Observed: 46.23 ft at 10:00PM Apr 26, 2015Observed: 46.23 ft at 10:15PM Apr 26, 2015Observed: 46.22 ft at 10:30PM Apr 26, 2015Observed: 46.21 ft at 10:45PM Apr 26, 2015Observed: 46.2 ft at 11:00PM Apr 26, 2015Observed: 46.19 ft at 11:15PM Apr 26, 2015Observed: 46.18 ft at 11:30PM Apr 26, 2015Observed: 46.17 ft at 11:45PM Apr 26, 2015Observed: 46.16 ft at 12:00AM Apr 27, 2015Observed: 46.16 ft at 12:15AM Apr 27, 2015Observed: 46.15 ft at 12:30AM Apr 27, 2015Observed: 46.14 ft at 12:45AM Apr 27, 2015Observed: 46.13 ft at 1:00AM Apr 27, 2015Observed: 46.12 ft at 1:15AM Apr 27, 2015Observed: 46.12 ft at 1:30AM Apr 27, 2015Observed: 46.11 ft at 1:45AM Apr 27, 2015Observed: 46.1 ft at 2:00AM Apr 27, 2015Observed: 46.1 ft at 2:15AM Apr 27, 2015Observed: 46.09 ft at 2:30AM Apr 27, 2015Observed: 46.09 ft at 2:45AM Apr 27, 2015Observed: 46.08 ft at 3:00AM Apr 27, 2015Observed: 46.08 ft at 3:15AM Apr 27, 2015Observed: 46.07 ft at 3:30AM Apr 27, 2015Observed: 46.07 ft at 3:45AM Apr 27, 2015Observed: 46.06 ft at 4:00AM Apr 27, 2015Observed: 46.06 ft at 4:15AM Apr 27, 2015Observed: 46.06 ft at 4:30AM Apr 27, 2015Observed: 46.05 ft at 4:45AM Apr 27, 2015Observed: 46.05 ft at 5:00AM Apr 27, 2015Observed: 46.04 ft at 5:15AM Apr 27, 2015Observed: 46.04 ft at 5:30AM Apr 27, 2015Observed: 46.03 ft at 5:45AM Apr 27, 2015Observed: 46.03 ft at 6:00AM Apr 27, 2015Observed: 46.03 ft at 6:15AM Apr 27, 2015Observed: 46.02 ft at 6:30AM Apr 27, 2015Observed: 46.01 ft at 6:45AM Apr 27, 2015Observed: 45.99 ft at 7:00AM Apr 27, 2015Observed: 45.98 ft at 7:15AM Apr 27, 2015Observed: 45.97 ft at 7:30AM Apr 27, 2015Observed: 45.96 ft at 7:45AM Apr 27, 2015Observed: 45.95 ft at 8:00AM Apr 27, 2015Observed: 45.94 ft at 8:15AM Apr 27, 2015Observed: 45.93 ft at 8:30AM Apr 27, 2015Observed: 45.91 ft at 9:15AM Apr 27, 2015Highest Forecast: 45.8 ft 2:00PM Apr 27, 2015Forecast: 45.7 ft 8:00PM Apr 27, 2015Forecast: 45.6 ft 2:00AM Apr 28, 2015Forecast: 45.5 ft 8:00AM Apr 28, 2015Forecast: 45.4 ft 2:00PM Apr 28, 2015Forecast: 45.3 ft 8:00PM Apr 28, 2015Forecast: 45.2 ft 2:00AM Apr 29, 2015Forecast: 45.2 ft 8:00AM Apr 29, 2015USGS--Water Resources of the United StatesLOWM3(plotting HGIRG) Graph Created (9:30AM Apr 27, 2015)ObservedForecast (issued 11:27AM Apr 26)Latest observed value: 45.91 ft at 9:15 AM EDT 27-Apr-2015. Flood Stage is 52 ft
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About this graph
Tabular Data (UTC)
Tabular Data (EDT)
XML Data
RSS Files
Datum: NGVD29
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
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
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: NAD27

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 5.18 57.18 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: 12-Feb-2015 9:36 PM
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