St. Johns River above Lake Harney

1. 10.80 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.
2. 10.50 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.
3. 10.00 ftFlooding of homes in low lying areas becomes more significant. Many secondary roads are impassable, limiting access to homes.
4. 9.50 ftWater begins to move into homes in low lying areas along the river. Flooding around the Black Hammock area near Lake Jesup.
5. 9.30 ftMany secondary roads are flooded near Lake Harney. Flooding in the Hatbill Road area near Loughman Lake.
6. 9.00 ftWater enters the first story of homes on Whitcomb Drive between Crossover Lane and Lake Harney Road. Water covers Mullet Lake Park.
7. 8.80 ftWater covers Whitcomb Road.
8. 8.50 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.
9. 8.30 ftDocks are partially submerged along the river between Lake Harney and Lemon Bluff.
10. 8.00 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.
11. 7.50 ftSome docks, islands and small trees along the river north of Lake Harney will be covered with water, making boating hazardous.
12. 7.00 ftWater approaches boat ramps, docks in Lake Jesup Park and Mullet Lake Park.
13. 6.50 ftMinor flooding to a few low lying areas along the river.
14. 6.00 ftNo Wake Zones in effect and county parks closed for areas east of Lake Monroe to Lake Harney.

Chance of flooding, September to November

The three-month chances are the River Forecast Centers’ long-range flood outlook, issued September 15, 2026.

Most recent crests

• October 15, 2024: 10.15 ft
• November 13, 2022: 9.25 ft
• October 3, 2022: 12.67 ft
• July 10, 2018: 8.73 ft
• September 19, 2017: 10.52 ft
• August 28, 2008: 11.15 ft
• November 1, 2005: 9.11 ft
• October 2, 2004: 10.08 ft
• September 12, 2004: 9.50 ft
• September 21, 2001: 8.61 ft

• DownstreamSt. Johns River at Sanford
• Econlockhatchee River
• Econlockhatchee River
• St. Johns River at Lake Jesup Outlet near Sanford
• Little Econlockhatchee at Oviedo
• Scottsmoor Turnbull Creek Boat Ramp (in MHHW)
• Howell Creek
• St. Johns River at CHRISTMAS 5SE
• Howell Creek

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.

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.