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Dworshak and Brownlee Fall Chinook Hydro Operations

Stay informed on the latest developments in Dworshak and Brownlee Fall Chinook Hydro Operations. Learn about water releases, agreements, proposals, and challenges affecting fish survival and habitats. Monitor temperature control efforts and conservation strategies.

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Dworshak and Brownlee Fall Chinook Hydro Operations

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  1. Dworshak and Brownlee Fall Chinook Hydro Operations Greg Haller Nez Perce Tribe Department of Fisheries Resources Management

  2. Snake River Basin Adjudication Water • Up to 427kaf Upper Snake Storage Reservoirs currently released June-August depending on availability of willing sellers • Lease 60kaf Natural Flow rights. • 30 year Agreement • Remand? • New BA: Adaptive mgt. May-July releases; TMT Coordination; still dependent on willing sellers • Issues: Timing/Volume of pass-through at HCC to benefit juvenile FC

  3. Brownlee FC Operations/Impacts • FERC FEIS: Draft from full pool 237kaf June 21-July 31 • 150 KaF released no later than July 15th (but maintain pool elevation through July 4th) • IPC Proposal- No summer flow augmentation • NPT Proposal-sliding scale 237-937 KaF each yr • IPC Fall Chinook Spawning Program

  4. Brownlee FC Operations/Impacts • Cold winter temperatures retard emergence timing • Cold spring temperatures retards FC growth and slows migration • Warm summer- early fall temperatures reduce FC survival and likely reduce adult spawning success • Issues: - Where’s the SRBA water? - Temperature control? - Synchronize Brownlee and Dworshak operations to best benefit FC survival and life histories

  5. Dworshak FC Operations/Impacts • Project is on NPT reservation • 1.2 Maf flow augmentation (80 ft draft) July – Sept. for flow aug. and cooling lower Snake • Includes 200kaf NPT SRBA water targeted for Sept. (can be used in August as well) • Benefits SR juvenile FC and adult FC & Steelhead • Outflows depend on temp at LGR tailrace; attempt to maintain 68 degrees or less • EPA and COE temp modeling • Issues: Dworshak inequitable conservation burden compared to Brownlee

  6. EPA Modeling of Dworshak Temperatures

  7. Dworshak Drawdown

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