From The Street Railway Review
This entry is for the truss behind the arch in the foreground
Photo scanned by Internet Archive Book Images
View this photo at archive.org
BH Photo #334462
The bridges are named after the John Diehl Ditch. I assume the ditch is named for your great grandfather or another relative.
Just so you know, this entry is for the much older iron truss bridge (1880s) which supported the road, not the newer concrete arch carrying the interurban track in the foreground. That said, both crossed the John Diehl Ditch.
Anyone know the history of this bridge's name? My great great grandfather was a John Diehl from the area, who was a lifelong train engineer.
Art believed it to be one on the page for the interurban bridge.
Could this bridge be a Columbia Bridge Works bridge? The second photo the plaque looks suspiciously like one.
No problem. Hopefully we can find more information on the span.