Major Flood
10.5 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
7 ft
Minor Flood
5 ft
Action Stage
4.5 ft
What Floods at Each Level
10.6 ft
Major flooding along Mahwah River at Suffern. 8 feet of waters into homes basements. Major flooding in homes in the Squires Gate community along the Mahwah River, especially on Lonergan Drive.
7 ft
Moderate flooding along Mahwah River at Suffern communities. Moderate flooding in homes in the Squires Gate community along the Mahwah River, especially on Lonergan Drive.
5 ft
Minor flooding on homes along the Mahwah River at Suffern. Minor flooding in homes in the Squires Gate community along the Mahwah River, especially on Lonergan Drive.
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 |
|---|---|---|
| Sep 15, 1999 | 9.7 ft | — |
About This Gauge
Get Flood Alerts for Mahwah 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 Mahwah River at Suffern?
The Mahwah River at Suffern gauge is maintained by USGS (site 01387450) 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 Mahwah River at Suffern?
The NWS-defined flood stage for Mahwah River at Suffern is 5 feet. Action stage begins at 4.5 feet. Moderate flooding starts at 7 feet, and major flooding at 10.5 feet.
How do I get alerts when Mahwah River rises?
Download StormCast free on Google Play, go to River Gauges, and add Mahwah River at Suffern 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 Mahwah River at Suffern gauge located?
The gauge is located in Rockland County, New York at coordinates 41.1408°N, 74.1169°W. USGS site number: 01387450. Data is provided by the U.S. Geological Survey and the National Weather Service.
More Resources
Source & Notes
Data provided by: US Geological Survey, Observations courtesy of U.S. Geological Survey