payments to the contractors, which enabled them to finish on time. The lock was further upstream than the present lock complex at the point where the footbridge now crosses. It comprised three pairs of gates as stipulated in the act. Total cost for lock, cut, weir, ballast and ground was £22,035 10s. d. () of which the land from Lord Dysart's estate cost £282 10s. 5d.. The lock was, at first, highly unpopular with the local fishermen and bargemen. After attempts to smash it, the lock keeper was granted permission to keep "a blunderbuss with bayonet attached thereto" to ward off attacks. Rebuild, 1857 By 1827 the timber lock needed considerable repair and in 1829 the weir was destroyed by an accumulation of ice. It is noted that in 1843 the lock keeper prevented a steam vessel from ascending the lock. At that time steam vessels were limited to travel as far (upstream) as Richmond. As originally built, the lock had timber sides up to normal head water level, and turf above that. The crest of the weir was above low water level at Teddington, but following the removal of the piers of old London Bridge (demolished 1831) in 1832, the drop increased to and increased to when dredging of the river was carried out. At tidally lower water occasional grounding of barges took place below the bottom sill. Consideration was given to removing the lock altogether in 1840. 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. After the weir had been rebuilt in 1871, sluice bays spanned around , similar to the tumbling bays. Footbridges and barge lock The footbridges were opened in 1889 and finally the barge lock, the largest lock on the river, was built in 1904–1905. of the extracted gravel was used to raise the level of Cross Deep Ait, a former ait adjacent to Swan Island downstream, to protect it from flooding. The footbridges are Grade II listed. World War II In 1940 Teddington Lock was the assembly