When Bridges Move: From Tacoma Narrows to the Millennium Bridge

Deep End Era. Engineering with Sankalp · Oct 28, 2026 · 54m

On the opening weekend of London's Millennium Bridge in June 2000, thousands of walkers felt the deck start to sway, and two days later it closed. Episode one hundred and forty two explains why, starting with how every structure has its own notes, why steel bridges barely damp them, and how wind can make a bridge vibrate by shedding vortices, galloping or, most dangerously, flutter, the self-excited twisting that tore apart the Tacoma Narrows Bridge in 1940 in an ordinary breeze. Then we turn to the quieter ways bridges fail: wind underestimated on the Tay, buckling at Quebec, a cracked…