Fall Chinook Management Measures

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Presentation transcript:

Fall Chinook Management Measures Flow Temperature Control Transportation Spill Project Modifications

Summer Flow Management Goal is to refill all storage project to full pool by June 30. Draft reservoirs within draft limits to increase river flow during the summer months.

Summer Flow Management Volumes Storage Reservoir Draft Limit from Full (feet) Draft Volume (kaf) Libby 20 (10) 891 (455) Hungry Horse 467 (246) Grand Coulee 10 789 Banks Lake 5 130 Dworshak 80 1,200 Upper Snake 487 Canadian water 1,000 Total 4,964 (4,307)

Snake River Fall Chinook Salmon Research Summary 1992-2005

Conclusions (Connor et al. ) —Survival is influenced simultaneously by flow and temperature — Summer flow augmentation increases flow and decreases temperature —Summer flow augmentation increases survival

Most fish have been transported Transport evaluation with spill program is a high priority Less in recent years

Project Modifications Initial results of surface bypass studies indicate surface passage is an effective passage route for subyearling migrants.