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Hydrograph River at a Glance Download
St. Johns River above Lake Harney Stage (ft)Flow (kcfs)Highest Observation: 7.19 ft at 3:30PM Dec 05, 2022Observed: 7.18 ft at 3:45PM Dec 05, 2022Observed: 7.18 ft at 4:00PM Dec 05, 2022Observed: 7.18 ft at 4:15PM Dec 05, 2022Observed: 7.18 ft at 4:30PM Dec 05, 2022Observed: 7.18 ft at 4:45PM Dec 05, 2022Observed: 7.18 ft at 5:00PM Dec 05, 2022Observed: 7.18 ft at 5:15PM Dec 05, 2022Observed: 7.18 ft at 5:30PM Dec 05, 2022Observed: 7.18 ft at 5:45PM Dec 05, 2022Observed: 7.18 ft at 6:00PM Dec 05, 2022Observed: 7.18 ft at 6:15PM Dec 05, 2022Observed: 7.18 ft at 6:30PM Dec 05, 2022Observed: 7.17 ft at 6:45PM Dec 05, 2022Observed: 7.18 ft at 7:00PM Dec 05, 2022Observed: 7.17 ft at 7:15PM Dec 05, 2022Observed: 7.17 ft at 7:30PM Dec 05, 2022Observed: 7.17 ft at 7:45PM Dec 05, 2022Observed: 7.17 ft at 8:00PM Dec 05, 2022Observed: 7.17 ft at 8:15PM Dec 05, 2022Observed: 7.16 ft at 8:30PM Dec 05, 2022Observed: 7.17 ft at 8:45PM Dec 05, 2022Observed: 7.16 ft at 9:00PM Dec 05, 2022Observed: 7.17 ft at 9:15PM Dec 05, 2022Observed: 7.16 ft at 9:30PM Dec 05, 2022Observed: 7.17 ft at 9:45PM Dec 05, 2022Observed: 7.16 ft at 10:00PM Dec 05, 2022Observed: 7.16 ft at 10:15PM Dec 05, 2022Observed: 7.16 ft at 10:30PM Dec 05, 2022Observed: 7.16 ft at 10:45PM Dec 05, 2022Observed: 7.16 ft at 11:00PM Dec 05, 2022Observed: 7.16 ft at 11:15PM Dec 05, 2022Observed: 7.15 ft at 11:30PM Dec 05, 2022Observed: 7.16 ft at 11:45PM Dec 05, 2022Observed: 7.16 ft at 12:00AM Dec 06, 2022Observed: 7.15 ft at 12:15AM Dec 06, 2022Observed: 7.15 ft at 12:30AM Dec 06, 2022Observed: 7.15 ft at 12:45AM Dec 06, 2022Observed: 7.15 ft at 1:00AM Dec 06, 2022Observed: 7.15 ft at 1:15AM Dec 06, 2022Observed: 7.14 ft at 1:30AM Dec 06, 2022Observed: 7.15 ft at 1:45AM Dec 06, 2022Observed: 7.14 ft at 2:00AM Dec 06, 2022Observed: 7.14 ft at 2:15AM Dec 06, 2022Observed: 7.14 ft at 2:30AM Dec 06, 2022Observed: 7.15 ft at 2:45AM Dec 06, 2022Observed: 7.14 ft at 3:00AM Dec 06, 2022Observed: 7.14 ft at 3:15AM Dec 06, 2022Observed: 7.14 ft at 3:30AM Dec 06, 2022Observed: 7.14 ft at 3:45AM Dec 06, 2022Observed: 7.14 ft at 4:00AM Dec 06, 2022Observed: 7.13 ft at 4:15AM Dec 06, 2022Observed: 7.13 ft at 4:30AM Dec 06, 2022Observed: 7.13 ft at 4:45AM Dec 06, 2022Observed: 7.13 ft at 5:00AM Dec 06, 2022Observed: 7.13 ft at 5:15AM Dec 06, 2022Observed: 7.13 ft at 5:30AM Dec 06, 2022Observed: 7.13 ft at 5:45AM Dec 06, 2022Observed: 7.13 ft at 6:00AM Dec 06, 2022Observed: 7.13 ft at 6:15AM Dec 06, 2022Observed: 7.13 ft at 6:30AM Dec 06, 2022Observed: 7.13 ft at 6:45AM Dec 06, 2022Observed: 7.13 ft at 7:00AM Dec 06, 2022Observed: 7.12 ft at 7:15AM Dec 06, 2022Observed: 7.12 ft at 7:30AM Dec 06, 2022Observed: 7.12 ft at 7:45AM Dec 06, 2022Observed: 7.12 ft at 8:00AM Dec 06, 2022Observed: 7.12 ft at 8:15AM Dec 06, 2022Observed: 7.11 ft at 8:30AM Dec 06, 2022Observed: 7.12 ft at 8:45AM Dec 06, 2022Observed: 7.11 ft at 9:00AM Dec 06, 2022Observed: 7.11 ft at 9:15AM Dec 06, 2022Observed: 7.12 ft at 9:30AM Dec 06, 2022Observed: 7.11 ft at 9:45AM Dec 06, 2022Observed: 7.11 ft at 10:00AM Dec 06, 2022Observed: 7.11 ft at 10:15AM Dec 06, 2022Observed: 7.11 ft at 10:30AM Dec 06, 2022Observed: 7.02 ft at 7:45AM Dec 07, 2022Observed: 7.03 ft at 8:00AM Dec 07, 2022Observed: 7.03 ft at 8:15AM Dec 07, 2022Observed: 7.02 ft at 8:30AM Dec 07, 2022Observed: 7.02 ft at 8:45AM Dec 07, 2022Observed: 7.02 ft at 9:00AM Dec 07, 2022Observed: 7.02 ft at 9:15AM Dec 07, 2022Observed: 7.01 ft at 9:30AM Dec 07, 2022Observed: 7.02 ft at 9:45AM Dec 07, 2022Observed: 7.02 ft at 10:00AM Dec 07, 2022Observed: 7.01 ft at 10:15AM Dec 07, 2022Observed: 7.01 ft at 10:30AM Dec 07, 2022Observed: 7.02 ft at 10:45AM Dec 07, 2022Observed: 7.01 ft at 11:00AM Dec 07, 2022Observed: 7.02 ft at 11:15AM Dec 07, 2022Observed: 7.01 ft at 11:30AM Dec 07, 2022Observed: 7.01 ft at 11:45AM Dec 07, 2022Observed: 7.01 ft at 12:00PM Dec 07, 2022Observed: 7.01 ft at 12:15PM Dec 07, 2022Observed: 7.01 ft at 12:30PM Dec 07, 2022Observed: 7.01 ft at 12:45PM Dec 07, 2022Observed: 7.01 ft at 1:00PM Dec 07, 2022Observed: 7.01 ft at 1:15PM Dec 07, 2022Observed: 7 ft at 1:30PM Dec 07, 2022Observed: 7 ft at 1:45PM Dec 07, 2022Observed: 7 ft at 2:00PM Dec 07, 2022Observed: 7 ft at 2:15PM Dec 07, 2022Observed: 7.01 ft at 2:30PM Dec 07, 2022Highest Forecast: 7 ft 7:00PM Dec 07, 2022Highest Forecast: 7 ft 1:00AM Dec 08, 2022Forecast: 6.9 ft 7:00AM Dec 08, 2022Forecast: 6.9 ft 1:00PM Dec 08, 2022Forecast: 6.9 ft 7:00PM Dec 08, 2022Forecast: 6.9 ft 1:00AM Dec 09, 2022Forecast: 6.8 ft 7:00AM Dec 09, 2022Forecast: 6.8 ft 1:00PM Dec 09, 2022Forecast: 6.8 ft 7:00PM Dec 09, 2022Forecast: 6.8 ft 1:00AM Dec 10, 2022Forecast: 6.7 ft 7:00AM Dec 10, 2022Forecast: 6.7 ft 1:00PM Dec 10, 2022Forecast: 6.7 ft 7:00PM Dec 10, 2022Forecast: 6.7 ft 1:00AM Dec 11, 2022Forecast: 6.6 ft 7:00AM Dec 11, 2022Forecast: 6.6 ft 1:00PM Dec 11, 2022Forecast: 6.6 ft 7:00PM Dec 11, 2022Forecast: 6.6 ft 1:00AM Dec 12, 2022Forecast: 6.5 ft 7:00AM Dec 12, 2022USGS--Water Resources of the United StatesGENF1(plotting HGIRG) Graph Created (3:15PM Dec 7, 2022)ObservedForecast (issued 9:27AM Dec 7)Latest observed value: 7.01 ft at 2:30 PM EST 7-Dec-2022. Flood Stage is 8 ft
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About this graph
Tabular Data (UTC)
Tabular Data (EST)
XML Data
RSS Files
Datum: NGVD29
Metadata
NOTE: Forecasts for the St. Johns River above Lake Harney are issued as needed during times of high water, but are not routinely available.
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Downstream Gauge Downstream Gauge - near Sanford
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

For more information on your flood risk go to www.floodsmart.gov.
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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
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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.
About This Location Collapse

Latitude: 28.713889° N, Longitude: 81.035556° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft 8 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)		 Elevation
(gauge height = flood stage)		 Elevation information source
NAVD88 Not Available Not Available Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 0.0 ft 8.5 ft Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other Not Available Not Available  

Current/Historical Observations:
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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
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