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Not very tall at all. Maybe you're thinking about Tower Bridge.
Tower Bridge was constructed as an opening bridge to allow boats with tall masts to get into the Pool of London. It became available for use in 1894.
The bridge opens to allow tall ships to pass under it.
The London bridge is 456ft tall (about 1000 elephants stacked up).
No it isn't. London Bridge is a very ordinary bridge which crosses the river Thames in central London. Many tourists from other countries think that the iconic Tower Bridge is London Bridge, but it isn't. The name of London Bridge is famous throughout the world because of the children's song, 'London Bridge is Falling Down'.
About the size of the Tower Bridge in London.
Tower Bridge is the only bridge across the River Thames in London which can be raised to allow tall vessels to pass underneath it.
Tower Bridge is just East of the City of London, about 2-miles downstream of the houses of parliament, right next to The Tower of London. The bridge spans the boroughs of Southwark (south) to Tower Hamlets (north). The nearest tube station is Tower Hill on the Circle and District lines.
The bridge separates in the middle and lifts up to let the ship through.
Tower Bridge crosses the River Thames from north to south and vice versa near central London. It is adjacent to the Tower of London and is the only bridge across the Thames which can be raised to allow tall ships to pass under it.
The tower bridge in London, England is 213 feet tall. This bridge is one of the most famous of all English landmarks.
There isn't another bridge anywhere else in the world that looks anything like Tower Bridge so it is instantly recognisable. It is the only bridge over the river Thames that can be raised to allow tall-masted boats to pass under it. It is still possible for pedestrians to cross the bridge, even when it is 'open' to allow a boat to pass underneath.