Major Flood
4.2 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
3.7 ft
Minor Flood
3.2 ft
Action Stage
2.8 ft
7-Day Water Level Chart
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Historic Crests
| Date | Stage | Flow |
|---|---|---|
| Oct 28, 2012 | 7.73 ft | — |
| Nov 7, 2012 | 4.14 ft | — |
About This Gauge
USGS Site
NWS LID
FIRN6
River
Great South Bay
County
Suffolk, NY
Coordinates
40.6914°N, 72.9897°W
Get Flood Alerts for Great South Bay
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 Great South Bay at Watch Hill (IN MLLW)?
The Great South Bay at Watch Hill (IN MLLW) gauge is maintained by USGS (site 01305575) 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 Great South Bay at Watch Hill (IN MLLW)?
The NWS-defined flood stage for Great South Bay at Watch Hill (IN MLLW) is 3.2 feet. Action stage begins at 2.8 feet. Moderate flooding starts at 3.7 feet, and major flooding at 4.2 feet.
How do I get alerts when Great South Bay rises?
Download StormCast free on Google Play, go to River Gauges, and add Great South Bay at Watch Hill (IN MLLW) 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 Great South Bay at Watch Hill (IN MLLW) gauge located?
The gauge is located in Suffolk County, New York at coordinates 40.6914°N, 72.9897°W. USGS site number: 01305575. Data is provided by the U.S. Geological Survey and the National Weather Service.
More Gauges on Great South Bay
More Resources
Source & Notes
Data provided by: US Geological Survey, Observations courtesy of U.S. Geological Survey
- Gauge awaiting repair - automated readings are not available at this time.