Trinity River A Junction City flow report
As of July 13, 2026, Trinity River A Junction City is flowing at 499 cfs with a gage height of 1.89 ft, holding steady over the past 24 hours. Source: USGS gauge #11526250, refreshed throughout the day.
Historical Data
Trinity River A Junction City at a glance
How Trinity River A Junction City is running right now, where it sits on the map, and the key gauge stats.
Trinity River A Junction City is flowing at 499 cfs, with the water sitting 1.89 ft at the gage. Flow has held roughly steady over the past 24 hours.
This is USGS gauge #11526250 in California. Over the past 10 days the average has been 508 cfs, peaking at 523 cfs.
Over the next 5 days, Trinity R A Junction City Ca is expected to hold near today's 503 cfs, toward roughly 485 cfs by 2026-07-16 (likely range 302-778 cfs) -- running well below the seasonal normal.
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.
Trinity River A Junction City
The primary flow providers are snowmelt and precipitation. The river feeds several tributaries, including the Lewiston Dam and reservoir, and the Trinity Dam and reservoir. Seasonal trends show that flow is highest in the spring and early summer due to snowmelt, and lowest in the fall and winter. A quirky fact about the hydrology of the river is that it is known for its "whitewater rafter's paradise" due to its challenging rapids.
Nearby streamflow levels
Cross-check Trinity River A Junction City's discharge against nearby gauges to spot whether the change here is local or regional.
| Gauge | Streamflow |
|---|---|
| Trinity R A Junction City Ca | 499 cfs |
| Trinity R Ab Nf Trinity R Nr Helena Ca | 471 cfs |
| Nf Trinity R A Helena Ca | 47 cfs |
| Trinity R A Douglas City Ca | 502 cfs |
| Trinity R Bl Limekiln Gulch Nr Douglas City Ca | 464 cfs |
| Indian C Nr Douglas City Ca | 6 cfs |
Nearby snowpack data
Snowpack at SNOTEL stations near Trinity River A Junction City. 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 |
|---|---|
| Nohrsc Red Rock Mountain | — |
| Big Flat | 0 in |
| Bonanza King | — |
| Nohrsc Middle Boulder 3 Snow Course | — |
| Nohrsc Slate Creek | 1 in |
| Highlands Lakes | 19 in |
Plan a trip
Reservoirs, boat launches, river runs, and fishing spots within driving distance of Trinity River A Junction City.
Nearby reservoirs
See all →
Boat launches
See all →
River runs
See all →
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 Trinity River A Junction City in the Snoflo app
Save this gauge as a favorite, set push alerts when streamflow crosses a threshold (e.g. "alert me when Trinity River A Junction City crosses 5,000 cfs"), and Snoflo's iOS app will push the moment USGS reports the crossing.
About Trinity River A Junction City
Where does the streamflow data for Trinity River A Junction City come from?
Discharge, gage height, and water temperature come directly from the USGS streamflow gauge 11526250. 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 Trinity River A Junction City 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 Trinity River A Junction City 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