Skip Navigation Link  
NOAA logo - Click to go to the NOAA homepage National Weather Service NWS logo - Click to go to the NWS homepage
Advanced Hydrologic Prediction Service
Image background of Navigation bar Left
Navigation Bar End Cap


This probabilistic forecast is issued by the Southeast River Forecast Center.
tab left off Hydrograph tab right off tab left off River at a Glance tab right off tab left off Download tab right off tab left on tab right on
About this graph
Forecasts for the St. Johns River above Lake Harney are issued as needed during times of high water, but are not routinely available.
Return to Area Map

Downstream Gauge Downstream Gauge - near Sanford
Zoom Level:16
Flood Categories (in feet)
Major Flood Stage: 10
Moderate Flood Stage: 9
Flood Stage: 8
Action Stage: 6
Low Stage (in feet): -9999

Historic Crests
(1) 12.70 ft on 10/03/2022
(2) 11.09 ft on 08/28/2008
(3) 10.62 ft on 10/13/1953
(4) 10.57 ft on 09/19/2017 (P)
(5) 10.10 ft on 10/01/1924
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 9.25 ft on 11/13/2022 (P)
(2) 12.70 ft on 10/03/2022
(3) 10.57 ft on 09/19/2017 (P)
(4) 11.09 ft on 08/28/2008
(5) 10.07 ft on 10/02/2004
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) -0.38 ft on 06/18/1945
(2) -0.37 ft on 04/05/1945
Show More Low Water Records
KML Image
Gauge LocationGauge Map Marker
Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.
Flood Impacts & Photos Collapse
If you notice any errors in the below information, please contact our Webmaster
10.8 Water 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 Water 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 Flooding of homes in low lying areas becomes more significant. Many secondary roads are impassable, limiting access to homes.
9.5 Water begins to move into homes in low lying areas along the river. Flooding around the Black Hammock area near Lake Jesup.
9.3 Many secondary roads are flooded near Lake Harney. Flooding in the Hatbill Road area near Loughman Lake.
9 Water enters the first story of homes on Whitcomb Drive between Crossover Lane and Lake Harney Road. Water covers Mullet Lake Park.
8.8 Water covers Whitcomb Road.
8.5 Water 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 Docks are partially submerged along the river between Lake Harney and Lemon Bluff.
8 Water 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 Some docks, islands and small trees along the river north of Lake Harney will be covered with water, making boating hazardous.
7 Water approaches boat ramps, docks in Lake Jesup Park and Mullet Lake Park.
6.5 Minor flooding to a few low lying areas along the river.
6 No Wake Zones in effect and county parks closed for areas east of Lake Monroe to Lake Harney.

Other Real-time and/or Archive Data Sources:

Collaborative Agencies Collapse
The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.
NWS Information
National Weather Service
Melbourne Weather Forecast Office
421 Croton Road
Melbourne, FL 32935
(321) 255-0212
Ask Questions/Webmaster
Page last modified: 2-Nov-2020 7:30 PM
Privacy Policy
About Us
Career Opportunities