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