Major Flood
17 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
15 ft
Minor Flood
12 ft
Action Stage
10 ft
What Floods at Each Level
17 ft
Trailers and houses on both sides of the river become endangered.
15 ft
Flooding begins to impact Mocassin Creek Circle on Florida side with some portions of the road becoming cut-off. Access roads on both sides of the river in Florida and Georgia begin to flood.
14 ft
Bethea State Forest campground sites completely flooded on Florida side and water begins to enter campground parking lot.
12 ft
Bethea State Forest campground sites begin to flood on the Florida side just north of the gage.
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 |
|---|---|---|
| Apr 4, 1973 | 22.98 ft | 11,600 cfs |
| Sep 18, 1928 | 19.9 ft | 6,060 cfs |
| Aug 23, 2008 | 19.15 ft | 5,740 cfs |
About This Gauge
USGS Site
NWS LID
MNIG1
River
St. Marys River
County
Charlton, GA
Coordinates
30.5175°N, 82.2306°W
Get Flood Alerts for St. Marys 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 St. Marys River at Moniac?
The St. Marys River at Moniac gauge is maintained by USGS (site 02228500) 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 St. Marys River at Moniac?
The NWS-defined flood stage for St. Marys River at Moniac is 12 feet. Action stage begins at 10 feet. Moderate flooding starts at 15 feet, and major flooding at 17 feet.
How do I get alerts when St. Marys River rises?
Download StormCast free on Google Play, go to River Gauges, and add St. Marys River at Moniac 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 St. Marys River at Moniac gauge located?
The gauge is located in Charlton County, Georgia at coordinates 30.5175°N, 82.2306°W. USGS site number: 02228500. Data is provided by the U.S. Geological Survey and the National Weather Service.
More Gauges on St. Marys River
On This River
Downstream: St. Marys River near Macclenny
More Resources
Source & Notes
Data provided by: US Geological Survey, Observations courtesy of U.S. Geological Survey