Sigh.
We have a London in Canada.
You're not lifting it out of the way, you're gonna pull it out of the way with a tugboat.
You can clear the debris in a week or two. It will take multiple years to build a new bridge.
I think you got bad information.
Looks like most crossing upstream are tunnels.
Be the change you want to see.
If it replaces a car it's cheap. Even replacing transit passes will save you money over some years.
zero effort
Ebike.
If the traffic is bad enough you might not have many options.