Does this warrant a change of status for this bridge to "dual use"?
This one might explain it:
It is a similar rolling bascule bridge. I've included an explanation of how it functions in the photo captions.
I would like to learn more about the workings of the 6th street bridge particually the movements. Is there a functioning like bridge somewhere else where I might be able to study its operations? I would appreicate any information about this bridge.