Red River At Port Royal flow report
As of July 13, 2026, Red River At Port Royal is flowing at 896 cfs with a gage height of 6.32 ft, receding 30% over the past 24 hours. Source: USGS gauge #03436100, refreshed throughout the day.
Historical Data
Red River At Port Royal at a glance
How Red River At Port Royal is running right now, where it sits on the map, and the key gauge stats.
Red River At Port Royal is flowing at 896 cfs, with the water sitting 6.32 ft at the gage. Flow is down 30% since yesterday as the gauge recedes.
This is USGS gauge #03436100 in Tennessee. Over the past 10 days the average has been 450 cfs, peaking at 1,290 cfs.
Over the next 5 days, Red River At Port Royal is expected to recede from today's 896 cfs, toward roughly 760 cfs by 2026-07-17 (likely range 306-1890 cfs) -- drier than normal for the date.
For real-time updates and historical context, see the realtime view or the historical comparison. Browse other gauges in the Tennessee 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.
Red River At Port Royal
The main constituents affecting flow are rainfall and snowmelt. There are no significant tributaries or dams in the immediate vicinity. Seasonal trends show that flow is highest in the spring and lowest in the late summer and fall. Interestingly, the Red River has a history of flash flooding, which can occur with little warning due to the steep terrain in the surrounding area. Overall, the data provided by the streamgauge is important for understanding the hydrology of the region and informing flood management strategies.
Nearby streamflow levels
Cross-check Red River At Port Royal's discharge against nearby gauges to spot whether the change here is local or regional.
| Gauge | Streamflow |
|---|---|
| Red River At Port Royal | 896 cfs |
| Sycamore Creek Near Ashland City | 91 cfs |
| Yellow Creek At Ellis Mills | 425 cfs |
| Whites Creek Near Bordeaux | 201 cfs |
| Harpeth River Near Kingston Springs | 779 cfs |
| Dry Creek Near Edenwold | 10 cfs |
Nearby snowpack data
Snowpack at SNOTEL stations near Red River At Port Royal. 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 |
|---|---|
| Berry Field/Percy Priest Lk 1w | 0 in |
| Crofton 3 N | 0 in |
| Bethpage 1s | 0 in |
Plan a trip
Reservoirs, boat launches, river runs, and fishing spots within driving distance of Red River At Port Royal.
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 Red River At Port Royal in the Snoflo app
Save this gauge as a favorite, set push alerts when streamflow crosses a threshold (e.g. "alert me when Red River At Port Royal crosses 5,000 cfs"), and Snoflo's iOS app will push the moment USGS reports the crossing.
About Red River At Port Royal
Where does the streamflow data for Red River At Port Royal come from?
Discharge, gage height, and water temperature come directly from the USGS streamflow gauge 03436100. 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 Red River At Port Royal 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 Red River At Port Royal report
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