Comment Re:Floating Bridge (Score 4, Informative) 99
The particular bridge at issue is the Lacey V. Murrow Memorial Bridge, used for the Sound Transit rail link across Lake Washington, and also used for I-90.
Sound Transit could not suffer the same fate as the SF Hydro in Norway, simply because that was a ferry, and the Sound Transit rail link is a bridge.
While the Murrow Bridge did sink in the past, that was in 1990 in the middle of a reconstruction project. The bridge was closed to traffic at the time. The sinking was due to a number of human errors that resulted in the watertight doors of the bridge pontoons getting removed, combined with a big storm that hit the area that Thanksgiving weekend, which proceeded to fill those open pontoons with rain and lake water.
Provided no one repeats that particular bit of idiocy (opening up the pontoons), the bridge is unlikely to sink a second time.
For details on the bridge sinking, see https://en.wikipedia.org/wiki/Lacey_V._Murrow_Memorial_Bridge#1990_disaster.