I will say it's rather pathetic the City let it get to this point. If they want to close it, just close it.
Redwood was rehabbed with a 50 year timeline, IIRC.
Edit: 40 years on the rustproofing. Not bad.
https://www.cbc.ca/news/canada/manit...opens-1.610114
More Redwood Bridge (sorry). A nice paper on what was done there.
http://conf.tac-atc.ca/english/resou...ocs/s7/Lau.pdf