Santa Margarita River A Ysidora flow report
As of July 13, 2026, Santa Margarita River A Ysidora is flowing at 0 cfs with a gage height of 7.05 ft. Source: USGS gauge #11046000, refreshed throughout the day.
Historical Data
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.
Santa Margarita River A Ysidora
The river is a source of water for various constituents, including agricultural, residential, and industrial users. The river flows through the Santa Margarita River Preserve, which is home to various species of plants and animals. The streamgauge measures the flow of water throughout the year, with seasonal trends that vary depending on rainfall and snowmelt. There are no major tributaries or dams on the Santa Margarita River, but there are several smaller streams that feed into it. The hydrology of the Santa Margarita River is important for understanding water resource management in the region, as well as the ecology of the river and its surrounding area.
Nearby streamflow levels
Cross-check Santa Margarita River A Ysidora's discharge against nearby gauges to spot whether the change here is local or regional.
| Gauge | Streamflow |
|---|---|
| Santa Margarita R A Ysidora Ca | 0 cfs |
| San Luis Rey R A Oceanside Ca | 0 cfs |
| Las Flores C Nr Oceanside Ca | 0 cfs |
| Oneill Lake Outlet Ch Nr Fallbrook Ca | 0 cfs |
| Oneill Lk Spill Ch Nr Fallbrook Ca | 0 cfs |
| Fallbrook C Nr Fallbrook Ca | 0 cfs |
Nearby snowpack data
Snowpack at SNOTEL stations near Santa Margarita River A Ysidora. 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 |
|---|---|
| Escondido 0.5 Sse | 0 in |
| El Cajon 2.8 Sse | 0 in |
Plan a trip
Reservoirs, boat launches, river runs, and fishing spots within driving distance of Santa Margarita River A Ysidora.
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 Santa Margarita River A Ysidora in the Snoflo app
Save this gauge as a favorite, set push alerts when streamflow crosses a threshold (e.g. "alert me when Santa Margarita River A Ysidora crosses 5,000 cfs"), and Snoflo's iOS app will push the moment USGS reports the crossing.
About Santa Margarita River A Ysidora
Where does the streamflow data for Santa Margarita River A Ysidora come from?
Discharge, gage height, and water temperature come directly from the USGS streamflow gauge 11046000. 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 Santa Margarita River A Ysidora 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 Santa Margarita River A Ysidora report
Create your free account to track this river — and everything else you love on the water.
- Flow alerts — get pinged the moment this river hits your range
- Save favorites — every river, lake & snowpack in one place
- Full history & forecasts — plus the free iPhone app