St. Johns River At Jacksonville flow report
As of July 13, 2026, St. Johns River At Jacksonville is flowing at 172,000 cfs with a gage height of 9.71 ft, holding steady over the past 24 hours. Source: USGS gauge #02246500, refreshed throughout the day.
Historical Data
St. Johns River At Jacksonville at a glance
How St. Johns River At Jacksonville is running right now, where it sits on the map, and the key gauge stats.
St. Johns River At Jacksonville is flowing at 172,000 cfs, with the water sitting 9.71 ft at the gage. Flow has held roughly steady over the past 24 hours.
This is USGS gauge #02246500 in Florida. Over the past 10 days the average has been 129,375 cfs, peaking at 172,000 cfs.
Over the next 5 days, St. Johns River At Jacksonville is expected to recede from today's 165000 cfs, toward roughly 104859 cfs by 2026-07-17 (likely range 41848-262746 cfs) -- about normal for the date.
For real-time updates and historical context, see the realtime view or the historical comparison. Browse other gauges in the Florida flow report.
Streamflow Forecast
Powered by PULSE — Snoflo’s Predictive Unified Learning & Simulation Engine, which learns from how this river has answered every past storm, snowmelt, and dry spell to forecast where it’s headed with a precision generic models can’t match.
How does this compare to past years?
Year-over-year overlay, annual peak discharge, the full distribution of daily flows on record, and the gauge's rating curve.
Weather Forecast
Next 5 days, hour by hour
Temperature line with weather symbols on top, snow + rain accumulation as columns, humidity as a dotted line.
5-day forecast table
Every 3 hours, broken out across temperature, snow, rain, humidity, and wind.
| Time | Condition | Temp (°F) | Snow (in) | Rain (in) | Humidity (%) | Wind (mps) | Wind dir |
|---|---|---|---|---|---|---|---|
| Loading detailed forecast… | |||||||
15-day forecast
Daily temperatures, snow, and rain projected over the next two weeks.
St. Johns River At Jacksonville
Johns River at Jacksonville, FL streamgauge measures the flow of the St. Johns River, which is influenced by several major tributaries including the Ocklawaha River and the Black Creek. The river flow is primarily influenced by rainfall and is subject to seasonal trends, with higher flows occurring during the wet season from June to September. The hydrology of the river is also impacted by several dams, including the Rodman Dam and the Buckman Lock and Dam. Interestingly, the St. Johns River is one of the few rivers in North America that flows northward, and it is home to a diverse range of wildlife including manatees, alligators, and dolphins.
Nearby streamflow levels
Cross-check St. Johns River At Jacksonville's discharge against nearby gauges to spot whether the change here is local or regional.
| Gauge | Streamflow |
|---|---|
| St. Johns River At Jacksonville | 172,000 cfs |
| Cedar River At San Juan Ave At Jacksonville | 194 cfs |
| Pottsburg Creek Nr South Jacksonville | 76 cfs |
| Ortega River At Kirwin Rd Nr Jacksonville | 13 cfs |
| Julington Crk At Old St August Rd Nr Bayard | 41 cfs |
| North Fork Black Creek Nr Middleburg | 9 cfs |
Nearby snowpack data
Snowpack at SNOTEL stations near St. Johns River At Jacksonville. Spring snowmelt is the dominant driver of streamflow in mountain basins -- a deep snowpack upstream means more runoff later in the season.
| SNOTEL station | Snowpack |
|---|---|
| Fernandina Beach | 0 in |
| St. Augustine 3.4 Sw | 0 in |
| Hastings 4ne | 0 in |
Plan a trip
Reservoirs, boat launches, river runs, and fishing spots within driving distance of St. Johns River At Jacksonville.
Boat launches
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River runs
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River levels & flood safety
- Read the level before you go
- A river that's runnable at one flow can be deadly at another. Check current discharge and gage height — like the values shown above — against the flood-stage thresholds, and remember levels can spike fast after rain or a dam release.
- Respect cold water
- Snowmelt rivers run cold even in summer. Sudden immersion triggers cold-water shock and saps strength within minutes. Wear a PFD, dress for the water temperature (not the air), and never wade or paddle alone.
- Watch for swiftwater hazards
- Strainers (downed trees), undercut rocks, and low-head dams are the deadliest features on moving water. High, fast, muddy water hides them. If in doubt, scout from shore and portage.
- Mind flash floods & releases
- Narrow canyons can flood from a storm miles upstream, and dam-controlled reaches can rise without warning. Know the forecast, the release schedule, and your exit before you launch.
Track St. Johns River At Jacksonville in the Snoflo app
Save this gauge as a favorite, set push alerts when streamflow crosses a threshold (e.g. "alert me when St. Johns River At Jacksonville crosses 5,000 cfs"), and Snoflo's iOS app will push the moment USGS reports the crossing.
About St. Johns River At Jacksonville
Where does the streamflow data for St. Johns River At Jacksonville come from?
Discharge, gage height, and water temperature come directly from the USGS streamflow gauge 02246500. Snoflo refreshes the time series throughout the day. Forecasts come from the NOAA / yr.no feed Snoflo's iOS app uses.
How often is the report updated?
USGS gauges report continuously (typically every 15 minutes). Snoflo pulls fresh values throughout the day — look for the "as of" timestamp on the streamflow hero card.
What's the difference between discharge and gage height?
Discharge (cubic feet per second, or cfs) is the volume of water flowing past the gauge each second. Gage height is how high the water sits at the gauge (feet). They're related by a rating curve specific to each gauge — higher water means more flow, but the exact ratio depends on channel shape.
How is "percent of median" calculated?
Today's discharge is compared to the historical median discharge on this calendar day across the gauge's full record. 100% = right on median; 200% = a very high year; 30% = a drought-level low.
What are flood stages, and is this river safe right now?
Flood stages are NWS-defined gage-height thresholds — Action, Minor, Moderate, Major — marking when nearby roads or floodplains start to be affected. "Safe" depends on your activity and skill: a level that's a fun paddle for an expert can be lethal for a wader. Always check the current level against the thresholds above and the safety links, and when in doubt, stay off the water.
Can I get alerts when St. Johns River At Jacksonville rises?
Yes — flow alerts are managed in the Snoflo iOS app. Favorite this gauge, set a streamflow threshold (e.g. "alert me when discharge crosses 5,000 cfs"), and you'll get a push the moment USGS reports the crossing.
Access the free St. Johns River At Jacksonville report
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