Old River A Bacon Island flow report
As of July 15, 2026, Old River A Bacon Island is flowing at 6,370 cfs with a gage height of 9.70 ft, rising 7041% over the past 24 hours. Source: USGS gauge #11313405, refreshed throughout the day.
Historical Data
Old River A Bacon Island at a glance
How Old River A Bacon Island is running right now, where it sits on the map, and the key gauge stats.
Old River A Bacon Island is flowing at 6,370 cfs, with the water sitting 9.70 ft at the gage. Flow is up 7041% since yesterday — a rising hydrograph.
This is USGS gauge #11313405 in California. Over the past 10 days the average has been 6,370 cfs, peaking at 6,370 cfs.
For real-time updates and historical context, see the realtime view or the historical comparison. Browse other gauges in the California flow report.
Engineering Data
Flow-duration statistics and observed peak-flow context computed from this gauge’s complete daily record (USGS #11313405).
Percentiles are flow-duration values computed from this gauge’s observed daily record as archived by Snoflo. Return periods are Weibull plotting-position estimates from observed annual maxima, provided as general reference context only. Always verify against official USGS NWIS records. Part of Snoflo for Engineering.
Streamflow Forecast
Over the next 5 days, Old R A Bacon Island Ca is expected to recede from today's 6370 cfs, toward roughly 4014 cfs by 2026-07-19 (likely range 1614-9984 cfs) -- drier than normal for the date.
Powered by PULSE — Snoflo’s forecast engine, trained on this gauge’s full record of storms, snowmelt, and dry spells.
| Date | Expected (p50) | Likely range (p25–p75) | vs normal | Projected stage |
|---|
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.
Old River A Bacon Island
The gauge is located on the San Joaquin River and measures water levels and discharge rates. The river has several tributaries, including the Stanislaus and Tuolumne rivers, which can impact flow rates at the gauge. Seasonal trends show higher flows in the spring due to snowmelt and lower flows in the summer and fall. Interesting facts about the hydrology include the impact of human activities, such as dam construction, on flow rates and the importance of flow data for managing water resources in California.
Nearby streamflow levels
Cross-check Old River A Bacon Island's discharge against nearby gauges to spot whether the change here is local or regional.
| Gauge | Streamflow |
|---|---|
| Old R A Bacon Island Ca | 6,370 cfs |
| Middle R At Middle River Ca | 8,240 cfs |
| Old R A Quimby Island Nr Bethel Island Ca | 2,760 cfs |
| Dutch Slough Bl Jersey Island Rd A Jersey Island | 384 cfs |
| Marsh C A Brentwood Ca | 0 cfs |
| False R Nr Oakley Ca | 13,000 cfs |
Nearby snowpack data
Snowpack at SNOTEL stations near Old River A Bacon Island. 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 |
|---|---|
| Knights Ferry 5.2 Wsw | 0 in |
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 Old River A Bacon Island in the Snoflo app
Save this gauge as a favorite, set push alerts when streamflow crosses a threshold (e.g. "alert me when Old River A Bacon Island crosses 5,000 cfs"), and Snoflo's iOS app will push the moment USGS reports the crossing.
About Old River A Bacon Island
Where does the streamflow data for Old River A Bacon Island come from?
Discharge, gage height, and water temperature come directly from the USGS streamflow gauge 11313405. 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 Old River A Bacon Island 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 Old River A Bacon Island report
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