| 1. | The lake has a reputation for periodically powerful, unnavigable storms.
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| 2. | Many black holes at once may make the game field unnavigable.
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| 3. | Over the centuries sand and silt deposits made the port unnavigable.
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| 4. | Tree-strewn roads unnavigable by buses contributed to the absentee rate.
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| 5. | He said it was unnavigable, being filled with ice.
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| 6. | The unnavigable river is used for power production and irrigation.
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| 7. | The Price is a small, shallow river and is normally unnavigable.
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| 8. | Some are already preparing to fire workers now that the river is unnavigable.
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| 9. | The Uncompahgre is unnavigable, except at high water.
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| 10. | The remaining six river locks are disused and unnavigable.
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