The Millennium Bridge, officially known as the London Millennium Footbridge, is a steel

Steel

Steel is an alloy that consists mostly of iron and has a carbon content between 0.2% and 2.1% by weight, depending on the grade. Carbon is the most common alloying material for iron, but various other alloying elements are used, such as manganese, chromium, vanadium, and tungsten...

 suspension bridge

Suspension bridge

A suspension bridge is a type of bridge in which the deck is hung below suspension cables on vertical suspenders. Outside Tibet and Bhutan, where the first examples of this type of bridge were built in the 15th century, this type of bridge dates from the early 19th century...

 for pedestrians crossing the River Thames

River Thames

The River Thames flows through southern England. It is the longest river entirely in England and the second longest in the United Kingdom. While it is best known because its lower reaches flow through central London, the river flows alongside several other towns and cities, including Oxford,...

 in London

London

London is the capital city of :England and the :United Kingdom, the largest metropolitan area in the United Kingdom, and the largest urban zone in the European Union by most measures. Located on the River Thames, London has been a major settlement for two millennia, its history going back to its...

, England, linking Bankside

Bankside

Bankside is a district of London, England, and part of the London Borough of Southwark. Bankside is located on the southern bank of the River Thames, east of Charing Cross, running from a little west of Blackfriars Bridge to just a short distance before London Bridge at St Mary Overie Dock to...

 with the City

City of London

The City of London is a small area within Greater London, England. It is the historic core of London around which the modern conurbation grew and has held city status since time immemorial. The City’s boundaries have remained almost unchanged since the Middle Ages, and it is now only a tiny part of...

. It is located between Southwark Bridge

Southwark Bridge

Southwark Bridge is an arch bridge for traffic linking Southwark and the City across the River Thames, in London, England. It was designed by Ernest George and Basil Mott. It was built by Sir William Arrol & Co. and opened in 1921...

 (downstream) and Blackfriars Railway Bridge

Blackfriars Railway Bridge

Blackfriars Railway Bridge is a railway bridge crossing the River Thames in London, between Blackfriars Bridge and the Millennium Bridge.There have been two structures with the name. The first bridge was opened in 1864 and was designed by Joseph Cubitt for the London, Chatham and Dover Railway...

 (upstream). The bridge is owned and maintained by the Bridge House Estates, a charitable trust overseen by the City of London Corporation. Construction of the bridge began in 1998, with the opening on 10 June 2000.

Londoners nicknamed the bridge the "Wobbly Bridge" after participants in a charity walk on behalf of Save the Children

Save the Children

Save the Children is an internationally active non-governmental organization that enforces children's rights, provides relief and helps support children in developing countries...

 to open the bridge felt an unexpected, and, for some, uncomfortable, swaying motion on the first two days after the bridge opened.