Tower Bridge is lifted approximately 1000 times a year to allow tall ships, cruise ships, naval vessels and other large craft to pass through.
Click here for instructions on booking bridge lifts.
Click here for details of scheduled bridge lifts.
Or call the Bridge Lift information line (24 hours) on + 44 (0) 207 940 3984.
It is a remarkable sight, and so it is well worth trying to time your visit with a bridge lift.