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The coming of [[rail transport|rail]] and [[road transport]]ation and the decline of the Empire, in the years following 1914, have reduced the prominence of the river. In the late 20th and early 21st century, London itself is no longer a port of any note and the Port of London has moved downstream to [[Tilbury]]. In return, the river has undergone a massive clean-up, since the filthy days of the late 19th and early- to mid-20th centuries and aquatic life has returned to its formerly 'dead' waters.
In the early 1980s a massive flood-control device, the [[Thames Barrier]], was opened. It is closed several times a year to prevent water damage to London's low-lying areas upstream (as in the [[1928 Thames flood]] for example). In the late 1990s, the 7 mile long [[Jubilee River]] was built, which acts as a [[flood]] channel for the Thames around Maidenhead and Windsor.<ref>[[Environment Agency]] (2005). ''[http://www.environment-agency.gov.uk/subjects/recreation/345623/631029/346131/348128/349190/349293/?lang=_e&theme=®ion=&subject=&searchfor=Jubilee+River&any_all=all&choose_order=&exactphrase=&withoutwords=&exclude_itemtype=Station%2C&include_itemtype=Acrobat%20Document%2CAttached%20File_e%2CAttached%20File_w%2CHTML%20Page%2C Jubilee River]''. Retrieved [[November 1]], [[2005]].</ref>
== Geography ==
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