Parker Pa. bridge 25 Stereoview 1
Photo uploaded by Art S.
View this photo at ebay.com
BH Photo #477672
It definitely looks tubular, but I can't make out enough definition to say one way or another.
Oh, my second choice is Rezner, either as Ohio Bridge Co. or once acquired by WIBCo. There isn't enough crispness in the images for me to say what the arches tube profile is.
I went down a rabbit hole that was pretty deep.
I discovered there was a bowstring here a while ago but had only one photo with part of one span showing.
Now there are just a few more.
I'm leaning toward Wrought Iron Bridge Co. but I'm not sure. What are your thoughts?
Nice collection of historic photos Art!