Yakima River System Adjusts Flows

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  The Yakima River system begins its annual flow adjustment on Aug. 27, 2026“Annual 'flip flop' of Yakima River system begins — Thu, 27 Aug 2026 16:45:00 -0700 Upper reservoir releases decrease to aid chinook salmon spawning while flows out of the Tieton dam ramp up to meet irrigation needs.”
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  Upper reservoir releases decrease to aid chinook salmon spawning“Upper reservoir releases decrease to aid chinook salmon spawning while flows out of the Tieton dam ramp up to meet irrigation needs.”
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  Flows out of Tieton Dam ramp up to meet irrigation needs“Upper reservoir releases decrease to aid chinook salmon spawning while flows out of the Tieton dam ramp up to meet irrigation needs.”
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  This change affects Yakima Valley farmers and river usersNo usable supporting receipt — unverified.
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  The Yakima River is monitored for flood risk by Yakima Health DistrictNo usable supporting receipt — unverified.
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  The adjustment supports both agricultural operations and fish habitatNo usable supporting receipt — unverified.
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  The system typically shifts flows in late August to balance seasonal needsNo usable supporting receipt — unverified.
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  The change follows Yakima Valley Water Conservation District guidelinesNo usable supporting receipt — unverified.
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  Farmers and environmental groups monitor the river for impacts on cropsNo usable supporting receipt — unverified.
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  Farmers and environmental groups monitor the river for impacts on fish populationsNo usable supporting receipt — unverified.