“to restore and maintain the Trinity River’s anadromous fishery resources …Â [by] … rehabilitating the river itself”
– U.S. Department of Interior, Record of Decision, 2000
WELCOME
TRRP is a multi-agency program with eight Partners forming the Trinity Management Council (TMC), plus numerous other collaborators.
The TRRP implements the 2000 Department of Interior (DOI) Record of Decision, which directs DOI to restore the fisheries of the Trinity River impacted by dam construction and related diversions of the Trinity River Division (TRD) of the Central Valley Project. Water diversions of the TRD compounded impacts to the river that occurred from gold mining and historic logging.
The main Program office is located in Weaverville, CA (contact), with staff working in the Program across various Partner offices.
The Trinity River was designated a Wild and Scenic River in 1981.
Lewiston Dam Release Change Orders From the Bureau of Reclamation
Releases to the Trinity River from Lewiston Dam will change from 450 cfs to 1050 cfs by 4:00 PM on September 12. On Tuesday, September 15, flows from Lewiston Dam will decrease from 1050 cfs to 850 cfs by 2:00 PM. The flow tables below and the Release Notifications page should update automatically. To check for the most recent orders, please go to our Release Notifications page. The Bureau of Reclamation is implementing these releaseas to augment flows on the lower Klamath River to mitigate late summer conditions for fish health purposes.
Restoration Achievements and Monitoring:
General:
The TRRP 2019 Annual Report is avaialble here.
Trinity River Mini-Dash
Check out our DataPort “Dashboard” for more data.
Data may take some time to load.  Graphs of values over time are zoomable!  Click on a point on the graph and drag right to select the zoom area.
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 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.
Proportion graph
(pie chart)
moved to
Flow Volume Summary.
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This short video highlights the history of the Trinity River and outlines the basis for river restoration following water diversions and centuries of harmful impacts from mining and logging.
RESOURCES FOR THE TRINITY RIVER
Record of Decision (ROD) and Legislative History