I am in agreement with Nathan. These definitely look like the foundations of Lally Columns.
This is all pure speculation, but my thought is that the caissons held the main span of a former bridge,and approach spans connected the stone abutments to the caissons. When the current bridge was erected, the caissons were removed to their current condition and the abutments were reused.
Actually, he said it doesn't matter.......the Colts would beat either one!
I'm surprised the troll is in a good mood today. I thought he wanted to see a Colts-Vikings game.
Normally, wooden falsework would have been erected for construction of the bridge. I suppose it is possible that they were added for extra support, but later removed. Being that it is a railroad span, the truth will probably never be known.
......by the way.....J.R.,your troll friend says hello.
Photo caption: YES......believe it or not.....It's a satellite dish!!
Hey, even trolls who live under bridges like movies and want Sunday Ticket.
Refernce photos 7 & 8 -
Possible that those old caissons were used during construction/launch of the bridge, or during a subsequent repair?