Millennium Bridge in London
reopened last friday. The bridge was closed last year, after the opening day crowds caused the bridge to begin "wobbling". The oscillation was reported to be somewhere between 70mm and 20cm, depending upon which account you read.
The bridge was
for the price of Pounds 5m, using 90 large damping devices.
affectionately named the "wobbly" by Londoners after the opening last year.
The bridge was engineered by a firm named
Arup. Needless to say, these engineering consultants were just a bit embarassed by the flaw, but it seems they've worked hard to stabilize the bridge, and restore their reputation. They've put together an excellent website which discusses in depth the oscillation, as well as it's cause (sideways force vector from ordinary walking).
Good reading for anyone interested in wobbly bridges, anyways.