 However, it was decided to rebuild the lock and in June 1854 proposals included providing capacity for seagoing craft with a side lock for pleasure traffic.In June 1857 the first stone of the new lock was laid at the present position, the central of the three, opened in 1858 together with the narrow skiff lock.The boat slide, separate, was added in 1869 and in the 1870s the weir collapsed twice causing enormous damage.