| 11. | The lock gates were lifted by a large wheel some 5 metres in diameter.
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| 12. | On 6 February 1967, she struck the lock gates at Dunkerque and was damaged.
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| 13. | After the 1987 navigation season, canals were drained and lock gates were permanently sealed.
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| 14. | Many of the lock gates on the Montgomeryshire Canal were replaced with cast iron gates.
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| 15. | After floods in 1930 damaged the lock gates at Kirkham several vessels were stranded upstream.
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| 16. | In January 2012, the locks were drained to allow the installation of new lock gates.
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| 17. | Separate navigation channels with lock gates were provided on this system for boats to negotiate falls.
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| 18. | The lower lock gates were, and each weighed.
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| 19. | A disused lock gate and swing bridge over the canal still exist beside the River Thames.
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| 20. | At one time a lock gate was removed and another, the lock was loaded with rocks.
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