Teddington Lock - UK, England
Teddington Lock is a complex of three locks and a weir on the River Thames in England at Ham to the west of London and marks the point at which the Thames becomes tidal. This is the boundary point between the Port of London Authority, which is the navigation authority downstream, and the Environment Agency, which is the navigation authority upstream and is marked by an obelisk on the Surrey bank a few hundred yards below the lock. Started in 1810 and completed in it present form in 1905, the lock complex consists of three locks, a conventional launch lock, a very large barge lock and a small skiff lock. A large bow shaped weir stretches across to Teddington from an island upstream of the lock which also acts as the centre point for the two bridges making up Teddington Lock Footbridge. In 1940 Teddington Lock was the assembly point for an enormous flotilla of small ships from the length of the River Thames to be used in the Evacuation of Dunkirk.