St. Marys River near Macclenny, FL
River level and flood forecast · Baker County
Moderate flooding15.2 ftas of Mon 3:45 PM
The river is 3.2 ft above flood stage (12 ft).
Forecast to fall below flood stage Mon 2 PM.
Flow: 5,200 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Mon, Oct 12, 10:33 AM. Forecasts change as rain falls and as upstream water arrives.
Flood stages
| Major flood stage | 19 ft |
| Moderate flood stage | 15 ft |
| Flood stage | 12 ft |
| Action stage | 10 ft |
| Record crest (June 28, 2012) | 24.38 ft |
What floods at each level
From the National Weather Service, highest first.
- 20 ftHigh banks on the Florida side begin to overflow. Trailers and houses along the river in Baker County are endangered. Trailers and houses on the Georgia side near Stokesville are endangered.
- 17 ftHigh water on the river reaches the bottom of the Stokes Road Bridge.
- 16 ftAccess roads on both sides of the river in Florida and Georgia are flooded, including the entire low lying stretch of St. Mary's River Bluff Road on the Georgia side which cuts off 40 to 50 homes. On the Florida side, the lower end of St. Mary's Cove Road past the public boat ramp becomes flooded and cuts off access to 20 to 30 homes. The Stokes Road Bridge over the river is generally closed due to high water.
- 15 ftFlooding begins to impact the lower end of Steel Bridge Road on the Florida side and cuts off access to the river gage as well as access to several homes.
- 14 ftFlooding of bottomlands along the river and some lower access roads including the lower half of St. Mary's River Bluff Road which cuts off 15 to 20 homes on the Georgia side.
- 12 ftMinor flooding of low lying areas and timber lands including some properties along St. Mary's River Bluff Road and the Cypress Landing Resort on the Georgia side.
Highest crests on record
- 24.38 ft — June 28, 2012
- 23.25 ft — September 13, 1964
- 22.86 ft — April 5, 1973
- 22.32 ft — September 12, 2017
- 22.29 ft — September 25, 1947
Recent crests: 13.7 ft (March 13, 2025) · 19.71 ft (August 7, 2024) · 12.25 ft (January 18, 2024) · 13.15 ft (January 12, 2024) · 17.09 ft (December 18, 2023)
Up and down the river, and nearby
- UpstreamSt. Marys River at Moniac, FL
- North Fork Black Creek near Middleburg, FL
- Cedar River at San Juan Ave Jacksonville, FL
- Ortega River at Argyle Forest Boulevard, FL
- Thomas Creek (FL) at SR 115 near Callahan, FL
- Trout River (FL) at Lem Turner Road, FL
- Black Creek at Middleburg, FL
- St. Johns River at Jacksonville, FL
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (MACF1); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.