Concord River at Lowell

1. 15.50 ftThis is the maximum recordable river stage at this location.
2. 10.00 ftSignificant flooding affects people living along the river. In Lowell, Merrill Street, Joiners and Clark Courts, Billerica and Lawrence streets may be most affected. In Billerica, Pershing Street and Stoney Drive as well as the Elsie Avenue neighborhood will be affected. In Bedford, impacted areas include Carlisle Road (Route 225), Bonnyvale Drive, and Sheridan Road. In Concord, the affected areas may include Route 117 and Route 2. Follow the directions of emergency local officals.
3. 9.00 ftSignificant residential flooding will affect people living along the Concord River. In Lowell, Merrill Street, Joiners and Clark Courts may be affected. In Billerica, Pershing Street and Stoney Drive as well as the Elsie Avenue neighborhood will be affected. Follow the directions of emergency management officials.
4. 8.50 ftFlooding is expected along portions of the Concord River. This includes homes on Joiners and Clark Courts and Merrill Street in Lowell. It also includes some residences in Billerica along Pershing Street, Stoney Drive, and on Elsie Avenue off River Street.
5. 8.00 ftLow lying areas along the Concord River will be flooded. The area most prone to flooding is a small section of Billerica along Elsie Avenue off River Street.

Chance of flooding, September to November

The three-month chances are the River Forecast Centers’ long-range flood outlook, issued September 14, 2026.

Most recent crests

• January 15, 2024: 8.13 ft
• December 21, 2023: 8.17 ft
• April 3, 2010: 9.64 ft
• March 17, 2010: 9.74 ft
• March 1, 2010: 8.33 ft
• March 11, 2008: 8.15 ft
• April 20, 2007: 8.48 ft
• May 17, 2006: 8.16 ft
• April 5, 2005: 8.34 ft
• April 5, 2004: 7.96 ft

• Merrimack River at Lowell
• Shawsheen River at Wilmington
• Shawsheen River at Andover
• Spicket River at Methuen
• Merrimack River at Lawrence
• Beaver Brook
• Merrimack River at Nashua
• Nashua River at East Pepperell

Forecasts by the Northeast River Forecast Center. Forecasts are issued routinely year-round. Stage may be affected by ice.

Stage, flood stages, impacts and crest history from NOAA’s National Water Prediction Service. Streamflow and the daily record from the U.S. Geological Survey.