Los Angeles River A Sepulveda Dam flow report
As of July 13, 2026, Los Angeles River A Sepulveda Dam is flowing at 48 cfs with a gage height of 0.77 ft, rising 20% over the past 24 hours. Source: USGS gauge #11092450, refreshed throughout the day.
Historical Data
Los Angeles River A Sepulveda Dam at a glance
How Los Angeles River A Sepulveda Dam is running right now, where it sits on the map, and the key gauge stats.
Los Angeles River A Sepulveda Dam is flowing at 48 cfs, with the water sitting 0.77 ft at the gage. Flow is up 20% since yesterday — a rising hydrograph.
This is USGS gauge #11092450 in California. Over the past 10 days the average has been 40 cfs, peaking at 52 cfs.
Over the next 5 days, Los Angeles R A Sepulveda Dam Ca is expected to recede from today's 48 cfs, toward roughly 34 cfs by 2026-07-18 (likely range 18-61 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 California 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.
Los Angeles River A Sepulveda Dam
The primary providers of water to the river are stormwater runoff and treated wastewater. The streamgauge is located downstream of the Sepulveda Dam, which is one of several flood control structures on the river. Seasonal trends in flow are influenced by rainfall patterns, with typically higher flows in the winter months. Interestingly, the Los Angeles River is primarily a concrete channel, with only small portions of natural streambed remaining. Despite this, efforts are underway to restore sections of the river to their natural state and promote biodiversity.
Nearby streamflow levels
Cross-check Los Angeles River A Sepulveda Dam's discharge against nearby gauges to spot whether the change here is local or regional.
| Gauge | Streamflow |
|---|---|
| Los Angeles R A Sepulveda Dam Ca | 48 cfs |
| Big Tujunga C Bl Hansen Dam Ca | 0 cfs |
| Arroyo Seco Nr Pasadena Ca | 1 cfs |
| Santa Clara R Nr Piru Ca | 43 cfs |
| Rio Hondo Ab Whittier Narrows Dam Ca | 1 cfs |
| Rio Hondo Bl Whittier Narrows Dam Ca | 0 cfs |
Plan a trip
Reservoirs, boat launches, river runs, and fishing spots within driving distance of Los Angeles River A Sepulveda Dam.
Nearby reservoirs
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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 Los Angeles River A Sepulveda Dam in the Snoflo app
Save this gauge as a favorite, set push alerts when streamflow crosses a threshold (e.g. "alert me when Los Angeles River A Sepulveda Dam crosses 5,000 cfs"), and Snoflo's iOS app will push the moment USGS reports the crossing.
About Los Angeles River A Sepulveda Dam
Where does the streamflow data for Los Angeles River A Sepulveda Dam come from?
Discharge, gage height, and water temperature come directly from the USGS streamflow gauge 11092450. 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 Los Angeles River A Sepulveda Dam 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 Los Angeles River A Sepulveda Dam report
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