Chiswick Bridge is a reinforced concrete deck arch bridge over the River Thames in West London. One of three bridges opened in 1933 as part of an ambitious scheme to relieve traffic congestion west of London, it carries the A316 road between Chiswick on the north bank of the Thames and Mortlake on the south bank.Built on the site of a former ferry, the bridge is 606 feet (185 m) long and faced with 3,400 tons of Portland stone.