Rivers in Florida
St. Marys River near Macclenny
Below flood stage
3.14ftStage
Observed Sun, Sep 20, 3:45 PM EDT
- Flood stage
- 12.00 ft
- Record crest
- 24.38 ft2012
Flood stages and impacts
| Category | Stage |
|---|---|
| Major flood | 19.00 ft |
| Moderate flood | 15.00 ft |
| Minor flood | 12.00 ft |
| Action | 10.00 ft |
- 20.00 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.
- 17.00 ftHigh water on the river reaches the bottom of the Stokes Road Bridge.
- 16.00 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.
- 15.00 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.
- 14.00 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.
- 12.00 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.
Flood outlook
Chance of flooding, September to November
| Category | Chance |
|---|---|
| Minor flooding | 56% |
| Moderate flooding | 18% |
| Major flooding | Under 5% |
The three-month chances are the River Forecast Centers’ long-range flood outlook, issued September 15, 2026.
Crest history
451 crests on NOAA’s list since 1927.
| # | Date | Stage |
|---|---|---|
| 1 | June 28, 2012 | 24.38 ft |
| 2 | September 13, 1964 | 23.25 ft |
| 3 | April 5, 1973 | 22.86 ft |
| 4 | September 12, 2017 | 22.32 ft |
| 5 | September 25, 1947 | 22.29 ft |
| 6 | April 3, 1948 | 21.97 ft |
| 7 | September 7, 1950 | 21.96 ft |
| 8 | September 20, 1928 | 21.90 ft |
| 9 | October 22, 1950 | 21.23 ft |
| 10 | August 24, 2008 | 21.14 ft |
| 11 | September 8, 2004 | 21.06 ft |
| 12 | May 4, 1964 | 20.64 ft |
| 13 | March 31, 1970 | 19.88 ft |
| 14 | October 4, 1992 | 19.81 ft |
| 15 | October 26, 1947 | 19.72 ft |
| 16 | August 7, 2024 | 19.71 ft |
| 17 | February 19, 1998 | 19.69 ft |
| 18 | October 21, 1944 | 19.67 ft |
| 19 | October 8, 1996 | 19.62 ft |
| 20 | March 11, 1948 | 18.96 ft |
| 21 | February 24, 1998 | 18.85 ft |
| 22 | March 10, 2003 | 18.33 ft |
| 23 | October 2, 1953 | 18.27 ft |
| 24 | September 29, 2004 | 18.20 ft |
| 25 | October 2, 1929 | 18.18 ft |
Most recent crests
- March 13, 2025: 13.70 ft
- August 7, 2024: 19.71 ft
- January 18, 2024: 12.25 ft
- January 12, 2024: 13.15 ft
- December 18, 2023: 17.09 ft
- August 3, 2023: 12.65 ft
- September 12, 2022: 12.86 ft
- September 6, 2022: 13.33 ft
- August 30, 2022: 12.85 ft
- March 26, 2022: 13.31 ft
Nearby
Upstream, downstream and the gauges around this one.
What this means
Forecasts by the Southeast River Forecast Center. Forecasts are issued as needed during times of high water, but are not routinely available. River forecasts for this location take into account past precipitation and the precipitation amounts expected approximately 48 hours into the future from the forecast issuance time.
Sources
Stage, flood stages, impacts and crest history from NOAA’s National Water Prediction Service. Streamflow and the daily record from the U.S. Geological Survey.