Nassau River near Tisonia, FL
River level and flood forecast · Duval County
Normal-1.3 ftas of Mon 3:30 PM
The river is 2.6 ft below flood stage (1.3 ft).
Flow: 22,700 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 | 3.3 ft |
| Moderate flood stage | 2.3 ft |
| Flood stage | 1.3 ft |
| Action stage | 0.8 ft |
| Record crest (September 11, 2017) | 4.52 ft |
What floods at each level
From the National Weather Service, highest first.
- 3.3 ftExtensive inundation of structures and roads in the area. Evacuations of people or transfer of property to higher ground is likely.
- 2.29 ftSome inundation of structures and roads is expected. Evacuations of people or property to higher ground is possible.
- 1.3 ftMinimal or no property damage. Minor flooding of low lying roads, campgrounds, boat ramps, docks along the river basin.
- 0.8 ftShould water levels continue rising...preparations to protect property should begin.
Highest crests on record
- 4.52 ft — September 11, 2017
- 3.43 ft — November 10, 2022
- 3.02 ft — September 29, 2022
- 2.71 ft — July 4, 1995
- 2.33 ft — October 7, 2016
Recent crests: 2 ft (October 11, 2025) · 1.51 ft (October 11, 2025) · 2.1 ft (October 10, 2025) · 1.51 ft (October 10, 2025) · 1.45 ft (October 9, 2025)
Up and down the river, and nearby
- Dunn Creek at Dunn Creek Road, FL
- Clapboard Creek near Sheffield Road, FL
- Broward River below Biscayne Boulevard, FL
- Thomas Creek (FL) at SR 115 near Callahan, FL
- Trout River (FL) at Lem Turner Road, FL
- St. Marys River at Interstate 95, GA
- Atlantic Coast at Sea Camp Dock on Cumberland Island, GA
- St. Johns River at Jacksonville, FL
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (NATF1); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.