Old River A Quimby Island Near Bethel Island flow report
As of July 12, 2026, Old River A Quimby Island Near Bethel Island is flowing at 2,760 cfs with a gage height of 6.89 ft, receding 76% over the past 24 hours. Source: USGS gauge #11313434, refreshed throughout the day.
Historical Data
Old River A Quimby Island Near Bethel Island at a glance
How Old River A Quimby Island Near Bethel Island is running right now, where it sits on the map, and the key gauge stats.
Old River A Quimby Island Near Bethel Island is flowing at 2,760 cfs, with the water sitting 6.89 ft at the gage. Flow is down 76% since yesterday as the gauge recedes.
This is USGS gauge #11313434 in California. Over the past 10 days the average has been 7,119 cfs, peaking at 11,800 cfs.
For real-time updates and historical context, see the realtime view or the historical comparison. Browse other gauges in the California flow report.
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 Quimby Island Near Bethel Island
The gauge measures the amount of water flowing through the Middle River, which is a tributary of the San Joaquin River. The stream gauge provides data to water providers and constituents for decision-making regarding water usage and management. There are no significant dams on the Middle River, but the gauge measures water flow from several smaller tributaries. Seasonal trends show increased water flow during winter months due to precipitation and decreased flow during summer months due to evaporation and water usage. Interestingly, the gauge was named after Robert A. Quimby, who was a prominent water rights advocate in the early 20th century.
Nearby streamflow levels
Cross-check Old River A Quimby Island Near Bethel Island's discharge against nearby gauges to spot whether the change here is local or regional.
| Gauge | Streamflow |
|---|---|
| Old R A Quimby Island Nr Bethel Island Ca | 2,760 cfs |
| Old R A Bacon Island Ca | 89 cfs |
| Mokelumne R A Andrus Island Nr Terminous Ca | 1,480 cfs |
| Dutch Slough Bl Jersey Island Rd A Jersey Island | 384 cfs |
| False R Nr Oakley Ca | 13,000 cfs |
| Little Potato Slough A Terminous Ca | 7,590 cfs |
Nearby snowpack data
Snowpack at SNOTEL stations near Old River A Quimby Island Near Bethel 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 Quimby Island Near Bethel 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 Quimby Island Near Bethel Island crosses 5,000 cfs"), and Snoflo's iOS app will push the moment USGS reports the crossing.
About Old River A Quimby Island Near Bethel Island
Where does the streamflow data for Old River A Quimby Island Near Bethel Island come from?
Discharge, gage height, and water temperature come directly from the USGS streamflow gauge 11313434. 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 Quimby Island Near Bethel 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 Quimby Island Near Bethel Island report
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