East height limits.

Used to be one just north of Ann Arbor on 23, but I saw comments somewhere that is been replaced. I don't get on that stretch very often , so I can't verify. I think it was 13'10".

 

It is being replaced (a couple weeks ago they closed 23 down to lay the beams), but all the signs currently still say 13 '10" so I don't know what the new bridge will be at.

 

IIRC, any new construction related to the interstate has to be 16' to get federal money. Hopefully that applies here as well.

 

Probably not as the bridge isn't so much being replace as fixed. Back in February it was hit (again) by an excavator and basically destroyed the bridge over the north bound lanes. So all that's getting changed is half the bridge, so little to no chance of the height changing. (They could use skinnier beams, but that's about all, and will only add a few inches at most.)

 

Iowa had a couple just south of Sioux City they redid a couple years ago that were only 14'2". They did a combo of dropping the roadbed a couple inches and adding spacers below the slipjoints at the abutments, which also required building up the approaches, of course. Not sure exactly how tall they are now, but eyeballing trucks going under them they're up over 15'. I don't think they've been hit since then.

Of course I'm sure Colorado never expected someone to hit a bridge over 17' like that idiot just did a while back.