Dana, from what I've been able to uncover, 1981/2012 were rehab dates for the bridge.
Yes, as the bridge's original function was for railroad, not road.
Updated artcle says "Islamorada Fire Chief has said the bridge is “driveable.”"
The narrowness suggests RR to me.
Douglas, there's a concrete arch at this location, and you're on the Mystic River when the bridge is over the Malden River, which is further east.
This probably was the predecessor to the Woods Memorial Bridge.
Good job on finding more Scherzer brochure images, though.
It looks like a trestle with a trough/dispenser that looks like it was adopted from a railroad hopper car.
I've not seen anything like it, so I'd say it's worthy of inclusion.
If https://www.flickr.com/photos/nrhpphotos/21638739776/ is a pic of this bridge, it's a Canton bridge.
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A relevant meme:
Historicaerials confirms that.
Dana, this bridge and https://bridgehunter.com/ia/jasper/north-skunk-creek/ are the same.
Switchback Arch was the original name the railroad gave it, and the historic article explains how it functions as a 3-hinge arch: https://books.google.com/books?id=RDUxAQAAMAAJ&pg=PA218&dq=S...
Daniel added this based off of info posted by James Holzmeier, so he listed it as the old Wabash bridge, which was a truss.
But this isn't the Wabash line, and I agree with the assessment that it was a DPG.