B120 forecasts were released by the California Department of Water Resources on February 8 and April 8, 2023. For February, the forecast included a 90% probability that inflows to Trinity and Lewiston Lakes will meet or exceed 945,000 acre-feet for water year 2023 (Oct. 1, 2022 through Sept 30. 2023). For March, the forecast at the 90% level was to meet or exceed 1,075 acre-feet for water year 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.
Flow releases from Lewiston Dam to the Trinity River will follow the schedule presented below for March 15 through April 15, 2023. Dam releases will then commence spring flow release on April 16.
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