“to restore and maintain the Trinity River’s anadromous fishery resources … [by] … rehabilitating the river itself”
– U.S. Department of Interior, Record of Decision, 2000
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.
As part of channel rehabilitation activities to improve fishery habitat, the Bureau of Reclamation and Bureau of Land Management (co-lead federal agencies); U.S. Forest Service (cooperating federal agency) and the North Coast Regional Water Quality Control Board (state lead agency), announce the availability of a draft Environmental Assessment/Initial Study for the proposed Chapman Ranch Phase B channel rehabilitation project.
The draft environmental document that formally analyzes the impacts of this proposed project, and which meets California Environmental Quality Act (CEQA) and National Environmental Policy Act (NEPA) requirements is available for public review starting May 20, 2020 at https://www.trrp.net/library/document/?id=2466.
The public comment period will extend 30 days from the date of posting though June 21, 2020.
Comments can be submitted to Megan Simon at email@example.com. For further information or to request a copy of the document, please contact Megan Simon at firstname.lastname@example.org or 530-247-8513 (TTY 800-877-8339). Visit https://www.trrp.net/channel-rehabilitation-site-chapman-ranch-phase-b-proposed-2021-site/ for more information about the project.
Restoration Achievements and Monitoring:
Water Year 2020 is forecast as a Critically Dry year based upon the California Department of Water Resources Bulletin 120 median forecast for April 1. The forecast is for 515,000 acre feet of inflow to Trinity and Lewiston Reservoirs over the water year. This allocates 369,000 acre feet to the Trinity River under the 2000 Record of Decision. The TRRP's Trinity Management Council approved hydrograph may be downloaded here, or viewed with the Water Year 2020 Progression graph below.
Explore the Trinity River through TRRP 360-degree spherical photos!
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News and Media:
What does drought mean for endangered California salmon? - Science Daily
Trinity River Mini-Dash
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.
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.
Flow Volume Summary.
Linked to TRRP data viewer
Linked to TRRP online map
Linked to Source Website
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