That the bridge has to allow tall ships down the river.
Because tower bridges have a big base
THE Tower Bridge is in London.
Tower Bridge was built in 1894
200 feet
London
Bridges dont collapse because there are many supportive links below it that hold it up...also for bridges without supports underneath, (usually small bridges) have concreton sold ground holding it up
Tower Bridge
There are more than 200 bridges over the Thames, including Tower Bridge and London Bridge.
in the northern part of violet city across the bridges
There are many thousands of bridges in Britain, it would be a long project to count them all. Many are fascinating and amazing bridges like Tower bridge in London and the Forth Bridge in Scotland.
There are 109 bridges over the Thames,, not to be typed here though
the leader of the tower bridge is Brittany Noonan a famous bridge builder. who built many bridges as she got older