This one is a design build job, and I was on a losing consortium that priced this work up.
This one is a bit different from past rehabs, which were just re-deckings.
This time they have to rehab by fully rebuild some of the supporting piers
Called 'bents' since it is really 2 piers and a transverse cross beam that supports the longitudinal support girders.
So build temporary supports, on what is essentially really crappy land fill dumped on the south side of the railways to fill in a lakeside swamp about 120 years ago, to hold the girders up while bent is replaced.
No surprise to me.
Our company was doing design and contract inspection to put band aids on these bents about 20 years ago.
That job drilled deep holes in the end of the cracking cross beams.
Then sticking a long stud about 3 feet long in and epoxying it at the deepest part.
Then the plan after deep epoxy had set was to tighten the nut with a big plate under it on the protruding end to close up a bunch of cracks in the concrete.
Which also had epoxy injected in the biggest cracks to hold them together, and tighten the bolt while that epoxy was still soft.
Problem was about 30% of the long bolt holes did not find solid undeteriorated concrete to anchor to.
Sometimes you price a job, look at all the warts and risk items in it.
And find you have lost the bid, and get a wee smile, and say a silent 'thank god'.