Major Flood
20 ft
Current Water Level
Gage Height
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Streamflow
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Last Reading
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FLOOD STAGES
Know the flood categories.
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
Moderate Flood
17 ft
Minor Flood
14 ft
Action Stage
12 ft
What Floods at Each Level
18 ft
Flooding occurs at businesses near the ice arena parking lot.
16 ft
The parking lot on the east bank downstream of the Route 9 bridge floods.
14 ft
Lowland flooding occurs.
12 ft
Minor lowland flooding begins.
Impact statements from the National Weather Service, describing what typically happens at each water level.
7-Day Water Level Chart
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Historic Crests
| Date | Stage | Flow |
|---|---|---|
| Mar 19, 1936 | 26.2 ft | — |
| Sep 21, 1938 | 23 ft | — |
| Nov 4, 1927 | 20.8 ft | — |
About This Gauge
USGS Site
NWS LID
CONN3
River
Merrimack River
County
Merrimack, NH
Coordinates
43.2089°N, 71.5303°W
Get Flood Alerts for Merrimack River
StormCast monitors this gauge and sends a push notification to your phone when the water level crosses into a new flood category — even at 3 AM.
Frequently Asked Questions
What is the current water level of Merrimack River at Concord?
The Merrimack River at Concord gauge is maintained by USGS (site 01088400) and reports water levels every 15 minutes. Visit this page to see the latest reading updated live, or download StormCast to get push alerts when levels rise.
What is flood stage for Merrimack River at Concord?
The NWS-defined flood stage for Merrimack River at Concord is 14 feet. Action stage begins at 12 feet. Moderate flooding starts at 17 feet, and major flooding at 20 feet.
How do I get alerts when Merrimack River rises?
Download StormCast free on Google Play, go to River Gauges, and add Merrimack River at Concord to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category.
Where is the Merrimack River at Concord gauge located?
The gauge is located in Merrimack County, New Hampshire at coordinates 43.2089°N, 71.5303°W. USGS site number: 01088400. Data is provided by the U.S. Geological Survey and the National Weather Service.
More Gauges on Merrimack River
More Resources
Source & Notes
Data provided by: Observations courtesy of U.S. Geological Survey