How many were lost off Interstate 10 bridges?

Days ago, I watched a video shot from a chopper, flying the length of the twin spans between New Orleans and Slidell. Most have seen some video and still pictures of some of it. From 8/30:
Aerial footage of I-10 bridge over Lake Pontchartrain (This link does not work. If it's possible to link to something outside Blogger, I don't yet know how.) The video is at http://media.swagit.com/s/wbrz/The_Advocate/08302005-6.html . Glory Be! this link works! Guess I'll get this linking business figured out one of these days.

I have yet to hear of any questions raised about the ramificationsof this situation. Hundred of spans are missing, with others offset. Stranded on those bridges were at least two cars. There were no people apparent about those cars. I hope that they had survived, and were rescued.

The question arises: How many more cars were on those bridges, that were swept with their occupants, into the lake?

Perhaps, some local? fisherman might volunteer to begin a grid survey of the lake bottom around and West of the bridges, to find any cars that might be residing there. With their Sonar and GPS, they might mark the locations of any cars found, for eventual recovery of those victims.

In the process, they could mark the locations of any bridge spans found. Many of those spans might be usable in the re-construction of those bridges.

Such a search would necessarily have to be well organized and planned. I realize that the locals, in the New Orleans and Slidell vicinity may yet be too severely impacted to mount such an effort