Document Details
Citation: TRRP. 2016. Restoration Flow Releases on the Trinity River – Water Year 2015. Workgroup Report WR-TRRP-2016-1. Trinity River Restoration Program, Weaverville, California.
Document source:
River system: Trinity River
Title: Restoration Flow Releases on the Trinity River – Water Year 2015
Document type: Document or Report
Category: Tech Report
Publication date (yyyy-mm-dd): 2016-03-00
Physical location:

Flow releases are one of the primary management actions taken to restore the Trinity River fishery resources. The Trinity River Restoration Program develops annual flow release recommendations to meet water year specific objectives and broader program goals through a collaborative process. The purpose of this report is to document the actual flow releases, summarize diversions, and report temperature performance on the Trinity River, California, for water year 2015. The 2015 water year was classified as “Dry” based on the April 1st 50% Inflow Forecast from the California Department of Water Resources (DWR), which corresponded to a restoration release allotment of 453,000 ac-ft. The Dry hydrograph specified in the Record of Decision was implemented with modifications to accommodate habitat monitoring efforts, increase geomorphic work, and meet riparian objectives. This modified hydrograph is known as Dry Joint Physical-Riparian Alternative 1 Peak. The total actual volume of the TRRP restoration release was 450,700 ac-ft. An additional 57,300 ac-ft of water was released for the Hoopa Boat Dance and Klamath fishery flows, bringing the total volume passing the Lewiston gage (USGS#11525500) to 508,000 ac-ft. The U. S. Bureau of Reclamation exported a total of 450,500 ac-ft of water from the Trinity River to the Sacramento River in water year 2015. Trinity Reservoir started the water year on October 1 with 603,500 ac-ft and ended with 545,000 ac-ft. Temperature targets set by the Trinity River Flow Evaluation Study were maintained within the marginal limits for outmigrating smolts during 34% of 62 target days. Temperature compliance points set forth in WR 90-5 and NMFS (2000) to ensure adequate salmonid temperature conditions were satisfied for 85% of the 92 day fall spawning period, 80% of 55 days monitored during the summer holding period, and 69% of the 16 day summer spawning period. Evaluation of the effects of water year 2015 flow releases on ecosystem health are reported in monitoring reports that are summarized in the Trinity River Restoration Program 2015 Annual Report, available through the Trinity River Restoration Program Online Data Portal (ODP)

Author: Trinity River Restoration Program
Organization: Trinity River Restoration Program
Added: 2016-10-17 10:39 by
Updated: 2016-10-17 10:39 by
Restoration - Flows
TRRP Report