B120 forecasts were released by the California Department of Water Resources on February 8 and March 8, 2023. Under TRRP’s Winter Flow Variability plan, this allowed scheduling 60,000 acre feet of release from Lewiston Dam, above the winter base-flow level, for the February 15 – April 15 period, then an additional 60,000 acre feet for the March 15 – April 15 period.
The April B120 forecast was posted April 10, 2023, with an inflow of 1,620,000 acre-feet (median forecast), which determined the water-year type for the TRRP volume as “Wet”. The TRRP flow schedule that has been approved by the TMC for a Wet year is still pending final approval by the U.S. Department of Interior. This flow schedule includes two peaks at 11,000 cfs from Lewiston Dam within April (although both are so brief that the daily average release will be lower). An image of the hydrograph is provided below, along with a link to download a flyer that includes the daily-average schedule.
Flow Schedule Flyers:
ONLINE FLOW DATA
- Explore more flow information in our DataPort
- Trinity River watershed streamgage Data Package
Current Flows
Most data shown here are from the USGS via the waterservices site, plus the USBR and CDWR via the California Data Exchange. Data are provisional and may be recalculated before final approval. The TRRP site checks for new sub-daily values every 15 minutes and for new daily values twice per day. Note that “Full Natural Flow” is an automated estimate from CDWR of the flow that would naturally pass the Trinity Dam site if unimpeded – it is very sensitive to small variations in lake level measurements that may result in negative values when flows would naturally be low, but is more useful for storm events, snowmelt, and averages over longer times. The graphic for water released to the Trinity River versus the water diverted to the Central Valley tends to show higher values for the river until summer, when water exports to the Central Valley typically increase. Click here for a summary of Trinity River flow volumes.
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RESTORATION FLOW PAGES