Major Flood
5 ft
Current Water Level
Gage Height
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Streamflow
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Last Reading
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This is an NWS forecast point (LID: MIZF1). Live data may be limited. View on NWS AHPS →
FLOOD STAGES
Know the flood categories.
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
Moderate Flood
4 ft
Minor Flood
3.1 ft
Action Stage
2.2 ft
What Floods at Each Level
7 ft
Flooding of historic proportions along the Matanzas River. Water reaches the approach to the State Road 312 bridge on the west bank of the river. Homes west of A1A are either flooded or isolated by deep flood waters. Along the east bank of the river, flooding expands further inland from Alcala River to San Remo Road. In St. Augustine South, Shore Drive is impassible, with homes west of the road beginning to flood.
6 ft
Catastrophic flooding along the Matanzas River south of State Road 312. Many residences along the east bank of the river west of A1A are either impacted or isolated by flood waters. Some residential areas experience 2 to 3 feet of flooding. Along the west bank of the Matanzas River, flooding worsens and expands inland along Alcala Drive. Water begins to flood Shore Drive in St. Augustine South.
5 ft
Considerable flooding along the Matanzas River south of State Road 312. Several residences along the east bank of the river west of A1A continue to flood, some becoming isolated, especially near the Mizell Outfall as well as around Marsh Point Circle. Flooding worsens considerably around Marsh Creek Country Club. Along the west bank of the Matanzas River, flooding worsens along Shore Drive and expands inland along Alcala Drive.
4.5 ft
Some residences along the Mizell Outfall and adjacent canals begin to flood. Marsh Creek Circle begins to flood, affecting access to residences in this area. On the west bank of the river, flooding along Shore Drive expands, with water moving toward homes adjacent to the Matanzas River. Flooding significantly impacts the Douglas Crane Park and Boat Ramp.
4 ft
More significant impacts occur around the Marsh Creek Country Club with a few holes of the golf course flooded along with a nearby tennis court. Several residences from the Mizell Outfall southward to Marsh Point Circle have water flooding further into their backyards.
3.5 ft
Flooding continues near the Mizell Outfall and around Marsh Creek Country Club. Water near the top of the canal bulkheads and additional residences have water in their backyards along the river. On the west bank of the river, Shore Drive near Terrapin Road begins to flood.
3.1 ft
Flooding begins near the Mizell Outfall, mainly in swamp land along the canal and approaching the top of the bank along the Matanzas near homes. Flooding begins to affect areas around Marsh Creek Country Club, with flood waters beginning to impact portions of the golf course along the Matanzas River.
Impact statements from the National Weather Service, describing what typically happens at each water level.
Low-Water Impacts
5 ft
Stage needed to inundate designated Gulf Sturgeon critical habitat below Jim Woodruff Lock and Dam.
3 ft
Temporary (not sustainable) operating level for of Scholz Power Plant
What happens as water levels drop, per the National Weather Service.
7-Day Water Level Chart
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Historic Crests
| Date | Stage | Flow |
|---|---|---|
| Oct 11, 2025 | 4.22 ft | — |
| Oct 10, 2025 | 4.06 ft | — |
| Oct 9, 2025 | 3.44 ft | — |
About This Gauge
NWS LID
MIZF1
County
St. Johns, FL
Coordinates
29.8517°N, 81.2975°W
Get Flood Alerts for Mizell Outfall on Matanzas River (in MHHW)
StormCast monitors this gauge and sends a push notification to your phone when the water level crosses into a new flood category — even at 3 AM.
Frequently Asked Questions
What is the current water level of Mizell Outfall on Matanzas River (in MHHW)?
The Mizell Outfall on Matanzas River (in MHHW) gauge is maintained by USGS and reports water levels every 15 minutes. Visit this page to see the latest reading updated live, or download StormCast to get push alerts when levels rise.
What is flood stage for Mizell Outfall on Matanzas River (in MHHW)?
The NWS-defined flood stage for Mizell Outfall on Matanzas River (in MHHW) is 3.1 feet. Action stage begins at 2.2 feet. Moderate flooding starts at 4 feet, and major flooding at 5 feet.
How do I get alerts when this river rises?
Download StormCast free on Google Play, go to River Gauges, and add Mizell Outfall on Matanzas River (in MHHW) to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category.
Where is the Mizell Outfall on Matanzas River (in MHHW) gauge located?
The gauge is located in St. Johns County, Florida at coordinates 29.8517°N, 81.2975°W. Data is provided by the U.S. Geological Survey and the National Weather Service.
More Resources
Source & Notes
Data provided by: Courtesy of Hohonu
- Water levels are referenced to the Mean Higher High Water (MHHW) Datum. This datum can be used to approximate sea water inundation of normally dry ground near the coast. For specific impacts, please refer to the statements on this page.