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This probabilistic forecast is issued by the Northeast River Forecast Center.

	Hydrograph			River at a Glance			Download			Probability Information Weekly Chance of Exceeding Levels Chance of Exceeding Levels During Entire Period Short-term Probabilistic Guidance (Experimental)

For official forecast click here

Experimental Short Range Forecast Uncertainty (AHPS) - External Links: Product Description Document | Customer Survey

About this graph

Forecasts for the Merrimack River at Lowell are issued routinely year-round.

Vertical datum height surveyed by the USGS

Return to Area Map

Upstream Gauge

Zoom Level:16

Flood Categories (in feet)

Major Flood Stage:	58
Moderate Flood Stage:	54
Flood Stage:	52
Action Stage:	50
Low Stage (in feet):	-9999

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.

	Gauge Location	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

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.

Other Real-time and/or Archive Data Sources:

U.S. Geological Survey (USGS) Data and Site Info for Lowell

Additional Information

Potential River Levels - Used to

Potential River Levels Used to Estimate the Chance of Flooding and the Range of Possible River Levels
10 Day (HEFS)	7 Day (NAEFS)	7 Day (GEFS)

Note: Use the official hydrograph at the top of this web page for river levels within the next 72 hours.

Click individual graphics to enlarge.

Collaborative Agencies

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.

NWS Information

National Weather Service
Boston / Norton Weather Forecast Office
46 Commerce Way
Norton, MA 02766
(508) 622-3250
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Page last modified: 2-Nov-2020 7:30 PM

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