St. Johns River above Lake Harney, FL
River level and flood forecast · Seminole County
The river is 1.5 ft below flood stage (8 ft).
Forecast to rise to 6.8 ft Thu 8 AM, below the 8 ft flood stage.
Flow: 4,300 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Mon, Oct 12, 9:48 AM. Forecasts change as rain falls and as upstream water arrives.
Flood stages
| Major flood stage | 10 ft |
| Moderate flood stage | 9 ft |
| Flood stage | 8 ft |
| Action stage | 6 ft |
| Record crest (October 3, 2022) | 12.67 ft |
What floods at each level
From the National Weather Service, highest first.
- 10.8 ftWater covers State Road 46 and it may become impassable near Jungle Road and Prevatt Road. Standing water on secondary roads near the river deepens to more than three feet in some areas. Flooding becomes more significant to structures and marinas from above Lake Harney to the Lake Jesup area.
- 10.5 ftWater covers many secondary roads near the river, limiting access to homes to boats or high terrain vehicles. Flooding of homes along secondary roads near the river becomes more significant. Water begins to encroach on State Road 46 near Jungle Road and Prevatt Road.
- 10 ftFlooding of homes in low lying areas becomes more significant. Many secondary roads are impassable, limiting access to homes.
- 9.5 ftWater begins to move into homes in low lying areas along the river. Flooding around the Black Hammock area near Lake Jesup.
- 9.3 ftMany secondary roads are flooded near Lake Harney. Flooding in the Hatbill Road area near Loughman Lake.
- 9 ftWater enters the first story of homes on Whitcomb Drive between Crossover Lane and Lake Harney Road. Water covers Mullet Lake Park.
- 8.8 ftWater covers Whitcomb Road.
- 8.5 ftWater surrounds homes on stilts on Prevatt road, entering garages on the first story. Water fills yards and ditches along Whitcomb Drive and Lake Harney Road. Roads flood in the Palm Shores and Mullet Lake areas.
- 8.3 ftDocks are partially submerged along the river between Lake Harney and Lemon Bluff.
- 8 ftWater moves into yards on Prevatt Road off State Road 46 near Lake Harney. Flooding of boat ramps and roads occurs in Mullet Lake Park.
- 7.5 ftSome docks, islands and small trees along the river north of Lake Harney will be covered with water, making boating hazardous.
- 7 ftWater approaches boat ramps, docks in Lake Jesup Park and Mullet Lake Park.
- 6.5 ftMinor flooding to a few low lying areas along the river.
- 6 ftNo Wake Zones in effect and county parks closed for areas east of Lake Monroe to Lake Harney.
Highest crests on record
- 12.67 ft — October 3, 2022
- 11.15 ft — August 28, 2008
- 10.62 ft — October 13, 1953
- 10.52 ft — September 19, 2017
- 10.15 ft — October 15, 2024
Recent crests: 10.15 ft (October 15, 2024) · 9.25 ft (November 13, 2022) · 12.67 ft (October 3, 2022) · 8.73 ft (July 10, 2018) · 10.52 ft (September 19, 2017)
Up and down the river, and nearby
- DownstreamSt. Johns River near Sanford, FL
- St. Johns River at Lake Jesup Outlet near Sanford, FL
- Little Econlockhatchee near Oviedo, FL
- Little Wekiva River near ALTAMONTE SPRINGS 2N, FL
- Wekiva River near Sanford, FL
- St. Johns River near Cocoa, FL
- Boggy Creek near Taft/nr Narcoosee 6NW, FL
- St. Johns River near Deland, FL
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (GENF1); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.