| 21. | The Nine Foot Drain, also unnavigable, meets the Slea just before Southgate.
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| 22. | The Uncompahgre is unnavigable except at high water.
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| 23. | Although the link to the basin still exists, the basin itself is unnavigable.
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| 24. | For its whole course the Gade is unnavigable.
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| 25. | Erosion also resulted in several rivers being unnavigable.
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| 26. | Water transportation has ceased since decreasing water levels on the Patapsco have made it unnavigable.
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| 27. | Over the years this erosion caused sedimentation, leading the Western Branch to become unnavigable.
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| 28. | In times of flood it is unnavigable.
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| 29. | The river later proved unnavigable and unaccessable to the Indian Ocean due to Victoria Falls.
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| 30. | The dam will submerge over 300 shoals, which had rendered the upper Hongshui unnavigable.
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