The date given for this bridge is incorrect. The Smith Bridge Company was sold and became the Toledo Bridge Company around 1890. This bridge almost surely dates to the late 1880's. I've not seen a plaque like this one on any other bridge.
I wanted to get more photos (side views) of this bridge, but as you can see the trees and weeds have almost swallowed this bridge up. Even though the trees weren't in bloom there were still too many of them to take a good side view photo.
Webmaster's note: The photo that was here has been incorporated into the main site.