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Hydrograph River at a Glance Download
Merrimack River at Lowell Stage (ft)Flow (kcfs)Highest Observation: 42.96 ft at 12:30PM May 20, 2015Highest Observation: 42.96 ft at 12:45PM May 20, 2015Highest Observation: 42.96 ft at 1:00PM May 20, 2015Observed: 42.95 ft at 1:15PM May 20, 2015Observed: 42.95 ft at 1:30PM May 20, 2015Observed: 42.94 ft at 1:45PM May 20, 2015Observed: 42.94 ft at 2:00PM May 20, 2015Observed: 42.93 ft at 2:15PM May 20, 2015Observed: 42.93 ft at 2:30PM May 20, 2015Observed: 42.93 ft at 2:45PM May 20, 2015Observed: 42.92 ft at 3:00PM May 20, 2015Observed: 42.91 ft at 3:15PM May 20, 2015Observed: 42.91 ft at 3:30PM May 20, 2015Observed: 42.91 ft at 3:45PM May 20, 2015Observed: 42.9 ft at 4:00PM May 20, 2015Observed: 42.89 ft at 4:15PM May 20, 2015Observed: 42.88 ft at 4:30PM May 20, 2015Observed: 42.88 ft at 4:45PM May 20, 2015Observed: 42.88 ft at 5:00PM May 20, 2015Observed: 42.88 ft at 5:15PM May 20, 2015Observed: 42.87 ft at 5:30PM May 20, 2015Observed: 42.87 ft at 5:45PM May 20, 2015Observed: 42.86 ft at 6:00PM May 20, 2015Observed: 42.86 ft at 6:15PM May 20, 2015Observed: 42.86 ft at 6:30PM May 20, 2015Observed: 42.86 ft at 6:45PM May 20, 2015Observed: 42.85 ft at 7:00PM May 20, 2015Observed: 42.85 ft at 7:15PM May 20, 2015Observed: 42.86 ft at 7:30PM May 20, 2015Observed: 42.85 ft at 7:45PM May 20, 2015Observed: 42.85 ft at 8:00PM May 20, 2015Observed: 42.85 ft at 8:15PM May 20, 2015Observed: 42.85 ft at 8:30PM May 20, 2015Observed: 42.85 ft at 8:45PM May 20, 2015Observed: 42.84 ft at 9:00PM May 20, 2015Observed: 42.83 ft at 9:15PM May 20, 2015Observed: 42.82 ft at 9:30PM May 20, 2015Observed: 42.81 ft at 9:45PM May 20, 2015Observed: 42.81 ft at 10:00PM May 20, 2015Observed: 42.8 ft at 10:15PM May 20, 2015Observed: 42.8 ft at 10:30PM May 20, 2015Observed: 42.8 ft at 10:45PM May 20, 2015Observed: 42.8 ft at 11:00PM May 20, 2015Observed: 42.8 ft at 11:15PM May 20, 2015Observed: 42.8 ft at 11:30PM May 20, 2015Observed: 42.8 ft at 11:31PM May 20, 2015Observed: 42.8 ft at 11:45PM May 20, 2015Observed: 42.8 ft at 12:00AM May 21, 2015Observed: 42.79 ft at 12:15AM May 21, 2015Observed: 42.79 ft at 12:30AM May 21, 2015Observed: 42.79 ft at 12:45AM May 21, 2015Observed: 42.79 ft at 1:00AM May 21, 2015Observed: 42.79 ft at 1:15AM May 21, 2015Observed: 42.79 ft at 1:30AM May 21, 2015Observed: 42.79 ft at 1:45AM May 21, 2015Observed: 42.79 ft at 2:00AM May 21, 2015Observed: 42.79 ft at 2:15AM May 21, 2015Observed: 42.79 ft at 2:30AM May 21, 2015Observed: 42.79 ft at 2:45AM May 21, 2015Observed: 42.79 ft at 3:00AM May 21, 2015Observed: 42.79 ft at 3:15AM May 21, 2015Observed: 42.79 ft at 3:30AM May 21, 2015Observed: 42.79 ft at 3:45AM May 21, 2015Observed: 42.79 ft at 4:00AM May 21, 2015Observed: 42.79 ft at 4:15AM May 21, 2015Observed: 42.79 ft at 4:30AM May 21, 2015Observed: 42.8 ft at 4:45AM May 21, 2015Observed: 42.79 ft at 5:00AM May 21, 2015Observed: 42.79 ft at 5:15AM May 21, 2015Observed: 42.79 ft at 5:30AM May 21, 2015Observed: 42.79 ft at 5:45AM May 21, 2015Observed: 42.79 ft at 6:00AM May 21, 2015Observed: 42.79 ft at 6:15AM May 21, 2015Observed: 42.79 ft at 6:30AM May 21, 2015Observed: 42.79 ft at 6:45AM May 21, 2015Observed: 42.79 ft at 7:00AM May 21, 2015Observed: 42.79 ft at 7:15AM May 21, 2015Observed: 42.79 ft at 7:30AM May 21, 2015Observed: 42.79 ft at 7:45AM May 21, 2015Observed: 42.79 ft at 8:00AM May 21, 2015Observed: 42.79 ft at 8:15AM May 21, 2015Observed: 42.79 ft at 8:30AM May 21, 2015Observed: 42.79 ft at 8:45AM May 21, 2015Observed: 42.79 ft at 9:00AM May 21, 2015Observed: 42.79 ft at 9:15AM May 21, 2015Observed: 42.79 ft at 9:30AM May 21, 2015Observed: 42.79 ft at 9:45AM May 21, 2015Observed: 42.79 ft at 10:00AM May 21, 2015Observed: 42.79 ft at 10:15AM May 21, 2015Observed: 42.79 ft at 10:30AM May 21, 2015Observed: 42.8 ft at 10:45AM May 21, 2015Observed: 42.8 ft at 11:00AM May 21, 2015Observed: 42.8 ft at 11:15AM May 21, 2015Observed: 42.8 ft at 11:30AM May 21, 2015Observed: 42.8 ft at 11:31AM May 21, 2015Observed: 42.8 ft at 11:45AM May 21, 2015Observed: 42.8 ft at 12:00PM May 21, 2015Observed: 42.8 ft at 12:15PM May 21, 2015Observed: 42.82 ft at 12:30PM May 21, 2015Observed: 42.84 ft at 12:45PM May 21, 2015Observed: 42.86 ft at 1:00PM May 21, 2015Observed: 42.88 ft at 1:15PM May 21, 2015Observed: 42.91 ft at 1:30PM May 21, 2015Observed: 42.93 ft at 1:45PM May 21, 2015Observed: 42.94 ft at 2:00PM May 21, 2015Observed: 42.95 ft at 2:15PM May 21, 2015Observed: 42.95 ft at 2:30PM May 21, 2015Observed: 42.94 ft at 2:45PM May 21, 2015Observed: 42.89 ft at 3:00PM May 21, 2015Observed: 42.83 ft at 3:15PM May 21, 2015Observed: 42.77 ft at 3:30PM May 21, 2015Observed: 42.72 ft at 3:45PM May 21, 2015Observed: 42.67 ft at 4:00PM May 21, 2015Observed: 42.64 ft at 4:15PM May 21, 2015Observed: 42.61 ft at 4:30PM May 21, 2015Observed: 42.6 ft at 4:45PM May 21, 2015Observed: 42.59 ft at 5:00PM May 21, 2015Observed: 42.59 ft at 5:15PM May 21, 2015Observed: 42.59 ft at 5:30PM May 21, 2015Observed: 42.59 ft at 5:45PM May 21, 2015Observed: 42.59 ft at 6:00PM May 21, 2015Observed: 42.59 ft at 6:15PM May 21, 2015Observed: 42.59 ft at 6:30PM May 21, 2015Observed: 42.59 ft at 6:45PM May 21, 2015Observed: 42.59 ft at 7:00PM May 21, 2015Observed: 42.59 ft at 7:15PM May 21, 2015Observed: 42.6 ft at 7:30PM May 21, 2015Observed: 42.6 ft at 7:45PM May 21, 2015Observed: 42.6 ft at 8:00PM May 21, 2015Observed: 42.6 ft at 8:15PM May 21, 2015Observed: 42.6 ft at 8:30PM May 21, 2015Observed: 42.6 ft at 8:45PM May 21, 2015Observed: 42.6 ft at 9:00PM May 21, 2015Observed: 42.6 ft at 9:15PM May 21, 2015Observed: 42.6 ft at 9:30PM May 21, 2015Observed: 42.61 ft at 9:45PM May 21, 2015Observed: 42.61 ft at 10:00PM May 21, 2015Observed: 42.61 ft at 10:15PM May 21, 2015Observed: 42.61 ft at 10:30PM May 21, 2015Observed: 42.6 ft at 10:45PM May 21, 2015Observed: 42.61 ft at 11:00PM May 21, 2015Observed: 42.6 ft at 11:15PM May 21, 2015Observed: 42.6 ft at 11:30PM May 21, 2015Observed: 42.6 ft at 11:45PM May 21, 2015Observed: 42.6 ft at 11:46PM May 21, 2015Observed: 42.61 ft at 12:00AM May 22, 2015Observed: 42.61 ft at 12:15AM May 22, 2015Observed: 42.61 ft at 12:30AM May 22, 2015Observed: 42.61 ft at 12:45AM May 22, 2015Observed: 42.61 ft at 1:00AM May 22, 2015Observed: 42.61 ft at 1:15AM May 22, 2015Observed: 42.61 ft at 1:30AM May 22, 2015Observed: 42.6 ft at 1:45AM May 22, 2015Observed: 42.6 ft at 2:00AM May 22, 2015Observed: 42.6 ft at 2:15AM May 22, 2015Observed: 42.6 ft at 2:30AM May 22, 2015Observed: 42.6 ft at 2:45AM May 22, 2015Observed: 42.6 ft at 3:00AM May 22, 2015Observed: 42.6 ft at 3:15AM May 22, 2015Observed: 42.6 ft at 3:30AM May 22, 2015Observed: 42.6 ft at 3:45AM May 22, 2015Observed: 42.6 ft at 4:00AM May 22, 2015Observed: 42.6 ft at 4:15AM May 22, 2015Observed: 42.6 ft at 4:30AM May 22, 2015Observed: 42.6 ft at 4:45AM May 22, 2015Observed: 42.6 ft at 5:00AM May 22, 2015Observed: 42.6 ft at 5:15AM May 22, 2015Observed: 42.6 ft at 5:30AM May 22, 2015Observed: 42.6 ft at 5:45AM May 22, 2015Observed: 42.6 ft at 5:46AM May 22, 2015Observed: 42.6 ft at 6:00AM May 22, 2015Observed: 42.6 ft at 6:15AM May 22, 2015Observed: 42.6 ft at 6:30AM May 22, 2015Observed: 42.6 ft at 6:45AM May 22, 2015Observed: 42.6 ft at 7:00AM May 22, 2015Observed: 42.59 ft at 7:15AM May 22, 2015Observed: 42.59 ft at 7:30AM May 22, 2015Observed: 42.57 ft at 7:45AM May 22, 2015Observed: 42.57 ft at 8:00AM May 22, 2015Observed: 42.56 ft at 8:15AM May 22, 2015Observed: 42.56 ft at 8:30AM May 22, 2015Observed: 42.55 ft at 8:45AM May 22, 2015Observed: 42.55 ft at 9:00AM May 22, 2015Observed: 42.55 ft at 9:15AM May 22, 2015Observed: 42.55 ft at 9:30AM May 22, 2015Observed: 42.55 ft at 9:45AM May 22, 2015Observed: 42.55 ft at 10:00AM May 22, 2015Observed: 42.55 ft at 10:15AM May 22, 2015Observed: 42.55 ft at 10:30AM May 22, 2015Observed: 42.55 ft at 10:45AM May 22, 2015Observed: 42.55 ft at 11:00AM May 22, 2015Observed: 42.55 ft at 11:15AM May 22, 2015Observed: 42.55 ft at 11:30AM May 22, 2015Observed: 42.55 ft at 11:45AM May 22, 2015Observed: 42.55 ft at 11:46AM May 22, 2015Observed: 42.56 ft at 12:00PM May 22, 2015Observed: 42.56 ft at 12:15PM May 22, 2015Observed: 42.55 ft at 12:30PM May 22, 2015Observed: 42.54 ft at 12:45PM May 22, 2015Observed: 42.53 ft at 1:00PM May 22, 2015Observed: 42.51 ft at 1:15PM May 22, 2015Observed: 42.5 ft at 1:30PM May 22, 2015Observed: 42.49 ft at 1:45PM May 22, 2015Observed: 42.49 ft at 2:00PM May 22, 2015Observed: 42.48 ft at 2:15PM May 22, 2015Observed: 42.48 ft at 2:30PM May 22, 2015Observed: 42.48 ft at 2:45PM May 22, 2015Observed: 42.48 ft at 3:00PM May 22, 2015Observed: 42.48 ft at 3:15PM May 22, 2015Observed: 42.48 ft at 3:30PM May 22, 2015Observed: 42.48 ft at 3:45PM May 22, 2015Observed: 42.48 ft at 4:00PM May 22, 2015Observed: 42.48 ft at 4:15PM May 22, 2015Observed: 42.48 ft at 4:30PM May 22, 2015Observed: 42.48 ft at 4:45PM May 22, 2015Observed: 42.48 ft at 5:00PM May 22, 2015Observed: 42.49 ft at 5:15PM May 22, 2015Observed: 42.49 ft at 5:30PM May 22, 2015Observed: 42.49 ft at 5:45PM May 22, 2015Observed: 42.49 ft at 5:46PM May 22, 2015Observed: 42.49 ft at 6:00PM May 22, 2015Observed: 42.49 ft at 6:15PM May 22, 2015Observed: 42.49 ft at 6:30PM May 22, 2015Observed: 42.5 ft at 6:45PM May 22, 2015Observed: 42.5 ft at 7:00PM May 22, 2015Observed: 42.49 ft at 7:15PM May 22, 2015Observed: 42.49 ft at 7:30PM May 22, 2015Observed: 42.49 ft at 7:45PM May 22, 2015Observed: 42.49 ft at 8:00PM May 22, 2015Observed: 42.49 ft at 8:15PM May 22, 2015Observed: 42.49 ft at 8:30PM May 22, 2015Observed: 42.49 ft at 8:45PM May 22, 2015Observed: 42.49 ft at 9:00PM May 22, 2015Observed: 42.49 ft at 9:15PM May 22, 2015Observed: 42.49 ft at 9:30PM May 22, 2015Observed: 42.49 ft at 9:45PM May 22, 2015Observed: 42.49 ft at 10:00PM May 22, 2015Observed: 42.49 ft at 10:15PM May 22, 2015Observed: 42.49 ft at 10:30PM May 22, 2015Observed: 42.49 ft at 10:45PM May 22, 2015Observed: 42.49 ft at 11:00PM May 22, 2015Observed: 42.49 ft at 11:15PM May 22, 2015Observed: 42.49 ft at 11:30PM May 22, 2015Observed: 42.49 ft at 11:45PM May 22, 2015Observed: 42.49 ft at 11:46PM May 22, 2015Observed: 42.49 ft at 12:00AM May 23, 2015Observed: 42.49 ft at 12:15AM May 23, 2015Observed: 42.5 ft at 12:30AM May 23, 2015Observed: 42.5 ft at 12:45AM May 23, 2015Observed: 42.5 ft at 1:00AM May 23, 2015Observed: 42.5 ft at 1:15AM May 23, 2015Observed: 42.49 ft at 1:30AM May 23, 2015Observed: 42.49 ft at 1:45AM May 23, 2015Observed: 42.49 ft at 2:00AM May 23, 2015Observed: 42.5 ft at 2:15AM May 23, 2015Observed: 42.5 ft at 2:30AM May 23, 2015Observed: 42.5 ft at 2:45AM May 23, 2015Observed: 42.5 ft at 3:00AM May 23, 2015Observed: 42.5 ft at 3:15AM May 23, 2015Observed: 42.49 ft at 3:30AM May 23, 2015Observed: 42.49 ft at 3:45AM May 23, 2015Observed: 42.49 ft at 4:00AM May 23, 2015Observed: 42.49 ft at 4:15AM May 23, 2015Observed: 42.49 ft at 4:30AM May 23, 2015Observed: 42.49 ft at 4:45AM May 23, 2015Observed: 42.49 ft at 5:00AM May 23, 2015Observed: 42.5 ft at 5:15AM May 23, 2015Observed: 42.5 ft at 5:30AM May 23, 2015Observed: 42.5 ft at 5:45AM May 23, 2015Observed: 42.5 ft at 5:46AM May 23, 2015Observed: 42.49 ft at 6:00AM May 23, 2015Observed: 42.49 ft at 6:15AM May 23, 2015Observed: 42.49 ft at 6:30AM May 23, 2015Observed: 42.49 ft at 6:45AM May 23, 2015Observed: 42.5 ft at 7:00AM May 23, 2015Observed: 42.5 ft at 7:15AM May 23, 2015Observed: 42.5 ft at 7:30AM May 23, 2015Observed: 42.5 ft at 7:45AM May 23, 2015Observed: 42.5 ft at 8:00AM May 23, 2015Observed: 42.49 ft at 8:15AM May 23, 2015Observed: 42.49 ft at 8:30AM May 23, 2015Observed: 42.49 ft at 8:45AM May 23, 2015Observed: 42.49 ft at 9:00AM May 23, 2015Observed: 42.49 ft at 9:15AM May 23, 2015Observed: 42.49 ft at 9:30AM May 23, 2015Observed: 42.48 ft at 9:45AM May 23, 2015Observed: 42.49 ft at 10:00AM May 23, 2015Observed: 42.49 ft at 10:15AM May 23, 2015Observed: 42.48 ft at 10:30AM May 23, 2015Observed: 42.48 ft at 10:45AM May 23, 2015Observed: 42.48 ft at 11:00AM May 23, 2015Observed: 42.47 ft at 11:15AM May 23, 2015Observed: 42.46 ft at 11:30AM May 23, 2015Observed: 42.44 ft at 11:46AM May 23, 2015Highest Forecast: 42.5 ft 2:00PM May 23, 2015Highest Forecast: 42.5 ft 8:00PM May 23, 2015Highest Forecast: 42.5 ft 2:00AM May 24, 2015Highest Forecast: 42.5 ft 8:00AM May 24, 2015Forecast: 42.4 ft 2:00PM May 24, 2015Forecast: 42.4 ft 8:00PM May 24, 2015Forecast: 42.4 ft 2:00AM May 25, 2015Forecast: 42.4 ft 8:00AM May 25, 2015Forecast: 42.4 ft 2:00PM May 25, 2015Forecast: 42.4 ft 8:00PM May 25, 2015Forecast: 42.3 ft 2:00AM May 26, 2015Forecast: 42.3 ft 8:00AM May 26, 2015USGS--Water Resources of the United StatesLOWM3(plotting HGIRG) Graph Created (12:15PM May 23, 2015)ObservedForecast (issued 11:12AM May 23)Latest observed value: 42.44 ft at 11:46 AM EDT 23-May-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 9:34 PM
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