St Marks River at US-98 (in NAVD88)
Florida — Water Level & Flood Stage
Located in Wakulla County, Florida on the St Marks River. Live water level data from USGS, updated every 15 minutes.
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: SRUF1). Live data may be limited. View on NWS AHPS →
Flood Stages
Major Flood
8 ft
Moderate Flood
6 ft
Minor Flood
4.5 ft
Action Stage
3.5 ft
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
What Floods at Each Level
12 ft
Water approaches the base of the US-98 bridge. Water expands across Old Plank Road and approaches the restaurant just west of the US-98 and Old Plank intersection as well as flooding a portion of US-98 on the west side of the river.
9.5 ft
Water inundates homes along Old Plank Road with 3 to 4 ft depth in non-elevated structures. Water crosses Old Plank Road in several places.
8 ft
Water floods up to 2 feet deep in several residences along Old Plank Road just north of the bridge.
6 ft
Water reaches residences along Old Plank Road. Flooding becomes more extensive through the Newport Campground.
4.5 ft
Water floods the parking area at the US-98 boat ramp on the east bank of the river north of the bridge. Water overtops the bank on both sides of the river and begins to flood the backyards of residences along Old Plank Road and in portions of the Newport Campground.
3.5 ft
Water reaches the top of the US-98 Boat ramp on the east bank of the river just north of the bridge. Water reaches the base of non-floating docks along this reach of the 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 |
|---|---|---|
| Sep 27, 2024 | 5.52 ft | — |
| Sep 27, 2024 | 5.52 ft | — |
About This Gauge
NWS LID
SRUF1
River
St Marks River
County
Wakulla, FL
Coordinates
30.1995°N, 84.1778°W
Get Flood Alerts for St Marks River
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 St Marks River at US-98 (in NAVD88)?
The St Marks River at US-98 (in NAVD88) 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 St Marks River at US-98 (in NAVD88)?
The NWS-defined flood stage for St Marks River at US-98 (in NAVD88) is 4.5 feet. Action stage begins at 3.5 feet. Moderate flooding starts at 6 feet, and major flooding at 8 feet.
How do I get alerts when St Marks River rises?
Download StormCast free on Google Play, go to River Gauges, and add St Marks River at US-98 (in NAVD88) to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category — even when your screen is off.
Where is the St Marks River at US-98 (in NAVD88) gauge located?
The gauge is located in Wakulla County, Florida at coordinates 30.1995°N, 84.1778°W. Data is provided by the U.S. Geological Survey and the National Weather Service.
More Gauges on St Marks River
More Resources
Source & Notes
Data provided by: Courtesy of Florida Department of Environmental Protection