Pilling Street Bridge
Photo from Pinterest
License: Creative Commons Attribution-Share-Alike (CC BY-SA)
View this photo at pinterest.com
BH Photo #460803
Wrought Iron Bridge Company.
Portals appear to be very similar to this one:
And a portal view...any of the builder-savvy contributors here know the fabricator?
A more close up photo from 1937 here: https://www.pinterest.com/pin/513128951274710408/