St. Marys River at Moniac, FL
River level and flood forecast · Charlton County
Normal9.0 ftas of Mon 3:45 PM
The river is 3.0 ft below flood stage (12 ft).
Flow: 236 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Sun, Dec 31, 7 PM. Forecasts change as rain falls and as upstream water arrives.
Flood stages
| Major flood stage | 17 ft |
| Moderate flood stage | 15 ft |
| Flood stage | 12 ft |
| Action stage | 10 ft |
| Record crest (April 5, 1973) | 22.98 ft |
What floods at each level
From the National Weather Service, highest first.
- 17 ftTrailers and houses on both sides of the river become endangered.
- 15 ftFlooding 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 ftBethea State Forest campground sites completely flooded on Florida side and water begins to enter campground parking lot.
- 12 ftBethea State Forest campground sites begin to flood on the Florida side just north of the gage.
Highest crests on record
- 22.98 ft — April 5, 1973
- 19.9 ft — September 19, 1928
- 19.15 ft — August 24, 2008
- 18.69 ft — June 28, 2012
- 18.41 ft — September 13, 1964
Recent crests: 12.08 ft (March 12, 2025) · 14.65 ft (August 8, 2024) · 12.28 ft (April 13, 2024) · 14 ft (December 19, 2023) · 12.32 ft (September 4, 2022)
Up and down the river, and nearby
- DownstreamSt. Marys River near Macclenny, FL
- St. Marys River at Traders Hill, GA
- Suwannee River at Fargo, GA
- Thomas Creek (FL) at SR 115 near Callahan, FL
- Trout River (FL) at Lem Turner Road, FL
- Suwannee River at White Springs, FL
- Cedar River at San Juan Ave Jacksonville, FL
- North Fork Black Creek near Middleburg, FL
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (MNIG1); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.