| 31. | In 1967 a trip to the lock showed it unnavigable, but in reasonable condition.
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| 32. | Rocks and rapids make both unnavigable, but much timber goes down the Nam Hsim.
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| 33. | On the western end of Lake Erie, water levels fell to unnavigable levels near Cleveland.
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| 34. | But the trems $ reeds and filth that collect here make this section unnavigable and smelly.
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| 35. | Their violence when they are full makes them difficult to control, and they are unnavigable.
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| 36. | The Platte proved to be unnavigable.
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| 37. | Due to changes in the shape of the tunnel over time, the tunnel became unnavigable.
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| 38. | Closed since Tuesday, the Ship Channel is virtually unnavigable, said Coast Guard spokesman Marty Paul.
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| 39. | Streep actually learned to navigate Class V rapids, the category just below the level deemed unnavigable.
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| 40. | Most of the rivers in Yunnan are unnavigable, except for short distances or in broken stretches.
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