Several bridges on I-94 in Detroit have been reconstructed ahead of the eventual freeway reconstruction/widening. A few of these look unusual now because the new freeway will be realigned at those points and the new bridge has to be compatible with both the current and new alignments.
Here is Chene Street, looking west. The new westbound lanes will be on the right. You say that doesn't look like nearly enough room? The center pier is only temporary; when the freeway is rebuilt, a permanent center pier will be constructed 15-20 feet to the left. You can see new paving under the bridge at that spot; I'm guessing crews already constructed the footing for the new pier and then paved over it.
https://goo.gl/maps/WWyXxe2W9GPeGcEQ7Here is Concord Avenue, looking west. Again, the new westbound lanes will be to the right. This center pier is permanent; you can tell by its artsy design.
https://goo.gl/maps/tyXqXBujPvyAM4Y66The new network tied arch bridge at Second Street, first of its kind in Michigan. Apparently there isn't any place a center pier would be compatible with the new stack interchange at M-10, just a stone's throw west.
https://goo.gl/maps/2a3X2HjxmeMTxCES8