Learned a new word from this crisis, allision. It's specifically maritime, but it essentially boils down to "Moving thing hit stationary thing".
The news coverage on this event is as woeful as it is empty. I tracked down the first 90 minutes of the fire channel on youtube, and it is riveting stuff.
One guy set up on the north side of the bridge by the fort was the one who blocked off the traffic. He intended to go out to the work crew to get off the bridge, but that was when the bridge collapsed.
He survived, and was almost the one sane person on the scene. The dispatcher had bubble mouth and repeatedly relayed incorrect information, including that the vessel had sunk.
Multiple sleepy voices demand a clear radio channel, and assume command. Almost to a ONE, they demand to traverse the bridge to take command on the other side.
Dude who stops traffic repeatedly tells them the bridge is GONE, and personally sends the video to their cell phones. That isn't good radio hygene, but I'm glad he did it. After the fourth sleepy commander shows up, they stop demanding to cross the bridge.
One was a petty golly though, he kept implying that "some" of the bridge was still intact. Which is accurate. MINUS THE bless'ed MIDDLE OF THE BRIDGE.
Warning: Multiple very loud sirens.
https://www.youtube.com/watch?v=g3lz-oBnmYE