Major Flood
13 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
11 ft
Minor Flood
9 ft
Action Stage
8 ft
What Floods at Each Level
13 ft
Significant flooding affects homes in the area of Beacon Drive in Merrimack. Other low lying sections upstream into Amherst and Milford experience flooding.
11 ft
In Merrimack, homes in the Beacon Drive area flood. Other low lying areas upstream into Amherst and Milford flood.
10 ft
In Merrimack, several homes along a small portion of Beacon Drive begin to flood. In Amherst, low lying areas begin to flood.
9 ft
Flooding of low lying areas along the river begins in the town of Merrimack.
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 18, 1936 | 16.2 ft | 16,900 cfs |
| Sep 20, 1938 | 12.78 ft | 10,800 cfs |
| Apr 17, 2007 | 12.71 ft | 10,500 cfs |
About This Gauge
USGS Site
NWS LID
SOHN3
River
Souhegan River
County
Hillsborough, NH
Coordinates
42.8576°N, 71.5062°W
Get Flood Alerts for Souhegan 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 Souhegan River at Merrimack?
The Souhegan River at Merrimack gauge is maintained by USGS (site 01094000) 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 Souhegan River at Merrimack?
The NWS-defined flood stage for Souhegan River at Merrimack is 9 feet. Action stage begins at 8 feet. Moderate flooding starts at 11 feet, and major flooding at 13 feet.
How do I get alerts when Souhegan River rises?
Download StormCast free on Google Play, go to River Gauges, and add Souhegan River at Merrimack 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 Souhegan River at Merrimack gauge located?
The gauge is located in Hillsborough County, New Hampshire at coordinates 42.8576°N, 71.5062°W. USGS site number: 01094000. Data is provided by the U.S. Geological Survey and the National Weather Service.
More Gauges on Souhegan River
More Resources
Source & Notes
Data provided by: US Geological Survey, Observations courtesy of U.S. Geological Survey