Water Year 2018 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 530,000 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 has approved a recommended hydrograph that may be downloaded here (PDF). Or click here for the USBR news release.
FLOW SCHEDULING PROCESS
Based on early water year forecasts in February and March, technical representatives of the Trinity River Restoration Program develop flow release recommendations to meet various restoration objectives and management targets listed in Chapter 8 of the Trinity River Flow Evaluation Final Report [PDF – 10mb]. Deliberations start with the typical flow release schedule recommended in the Record of Decision that may be adapted to meet specific restoration needs for the current year.
The flow recommendations are then presented to the Trinity Adaptive Management Working Group (TAMWG) and the Trinity Management Council (TMC) in March or early April for consideration. A ‘summary of water conditions’ as of April 1st of the year, is published by the California Department of Water Resources on or about April 10; this includes a forecast of reservoir inflow for the water year, known as the ‘b120 forecast’, which establishes the water year type and volume for restoration of the Trinity River. The flow release recommendation approved by the TMC is then forwarded to the U.S. Bureau of Reclamation and U.S. Fish and Wildlife Service as CVPIA co-lead agencies for the U.S. Department of Interior, which has the final authority over dam releases.
ONLINE FLOW DATA
- Explore more flow information in our DataPort
- Trinity River watershed streamgage Data Package
- Current flow information from the USGS gages is reported on our home page in the blue box of “Trinity River Current Flows”.
RESTORATION FLOW PAGES