Major Flood
10 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
9 ft
Minor Flood
7.5 ft
Action Stage
6.5 ft
What Floods at Each Level
10 ft
Major flooding occurs. Homes on Brooklyn Street flooded in Groveton. Water up to homes off West Street.
9.5 ft
Cumberland Road and Northside Road flooded in numerous places in Groveton.
9 ft
Moderate flooding occurs. Non-residential properties off West Street inundated. Water up to Winter Street and Route 110 in Groveton.
8.5 ft
In Stark, water is up to properties on Corkum Road and Northside Roads.
8 ft
Water up to Cumberland Street or Northside Road in Northumberland. Northside Road in Stark flooded.
7.5 ft
Minor floooding occurs. Mechanics Street inundated along industrial areas in Groveton. Water encroaching on properties on Brooklyn Street and Mountain View Avenue.
6 ft
River at bankfull.
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 |
|---|---|---|
| May 19, 1969 | 12.01 ft | 24,100 cfs |
| Mar 26, 1953 | 9.44 ft | 9,950 cfs |
| Apr 22, 1954 | 9.01 ft | 8,880 cfs |
About This Gauge
USGS Site
NWS LID
GRUN3
River
Upper Ammonoosuc River
County
Coos, NH
Coordinates
44.6251°N, 71.4690°W
Get Flood Alerts for Upper Ammonoosuc 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 Upper Ammonoosuc River near Groveton?
The Upper Ammonoosuc River near Groveton gauge is maintained by USGS (site 01130000) 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 Upper Ammonoosuc River near Groveton?
The NWS-defined flood stage for Upper Ammonoosuc River near Groveton is 7.5 feet. Action stage begins at 6.5 feet. Moderate flooding starts at 9 feet, and major flooding at 10 feet.
How do I get alerts when Upper Ammonoosuc River rises?
Download StormCast free on Google Play, go to River Gauges, and add Upper Ammonoosuc River near Groveton 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 Upper Ammonoosuc River near Groveton gauge located?
The gauge is located in Coos County, New Hampshire at coordinates 44.6251°N, 71.4690°W. USGS site number: 01130000. Data is provided by the U.S. Geological Survey and the National Weather Service.
On This River
Downstream: Connecticut River at Dalton
More Resources
Source & Notes
Data provided by: USGS Station Information