[El Gato]

They did not fall simultaneously. In fact, the north side didn't collapse until a full quarter-minute (15 seconds) after the south end started falling

I think he meant both sides of the roadway, not both ends of the bridge. It did look like both sides failed at the same time, the bridge didn't seem to twist much as it fell.

[crazyshrink]

I couldnt see both shore sides on the security video from the lock. The shore sides of this bridge were quite different. One had an off ramp (extra support) right at the shoreline. One side was higher up than the other.