| 11. | A waterfall from the mouth prevents fish migration between the upper and lower river.
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| 12. | During the summer months the dams increase their water releases to aid fish migration downstream.
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| 13. | A minimum amount of flow must be maintained in Dry Creek to allow fish migration.
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| 14. | The plant's development included a high-tech fish ladder intended to promote fish migration, especially salmon.
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| 15. | This great fish migration is called the sardine run.
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| 16. | Today Hells Canyon Dam is the first total barrier to fish migration on the Snake.
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| 17. | Impacts were to impede fish migration and to cause the accretion of sediment behind the weir.
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| 18. | In addition, natural fish migration patterns can be modified when certain areas of this route become uninhabitable.
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| 19. | The weir attached to Low Mill has a drop which is still a barrier to fish migration.
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| 20. | The third alternative was chosen two years later, but did not substantially improve fish migration as expected.
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