| 21. | The Oldbury Arm was cleared of debris and five weirs were removed from it to facilitate fish migration.
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| 22. | Thus the two dams combined became the first artificial barrier to anadromous fish migration up the Snake River.
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| 23. | In the 1930s, observers noticed the increasing pollution of the river, as fish migration from Laguna de Bay diminished.
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| 24. | They began incubating salmon eggs, clearing logjams and obstacles for fish migration and plant trees to sustain the riverbanks.
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| 25. | The dam and reservoir have fragmented the upper Green River, blocking fish migration and significantly impacting many native species.
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| 26. | Among them are that the cable must not interefere with fish migration and that it must create problems with corrosion.
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| 27. | To cope with fish migration problems, the dam features fish ladders to help native salmon and George Simpson in 1841.
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| 28. | In the 1920s, a private company built the Benbow Dam, blocking fish migration to a large area of the basin.
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| 29. | The dam blocks fish migration routes several miles below their natural end at the Great Falls of the Potomac River.
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| 30. | The bottom of the culvert will include baffles to retain materials which will create a low-flow channel to aid fish migration.
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