River Thames Thames Estuary), the river is subject to tidal activity from the North Sea. Before the lock was installed, the river was tidal as far as Staines, about upstream. London, capital of Roman Britain, was established on two hills, now known as Cornhill and Ludgate Hill. These provided a firm base for a trading centre at the lowest possible point on the Thames. A river crossing was built at the site of London Bridge. London Bridge is now used as the basis for published tide tables giving the times of high tide. High tide reaches Putney about 30 minutes later than
Culham Bridge Culham Bridge Culham Bridge is a mediaeval bridge crossing a present backwater of the River Thames in England at Culham, Oxfordshire, near the town of Abingdon. The bridge crosses Swift Ditch which was at one time the main navigation channel of the River Thames until Abingdon Lock was built in 1790. The bridge formerly carried the A415 road from Abingdon to Dorchester, Oxfordshire, but was superseded in 1928 by a modern road bridge. It is a Grade II* listed building. Culham Bridge was built of stone between 1416 and 1422 to replace an ancient ford called Culham Hythe by a