I finally got in touch with a distant cousin. He said that the bridge was across Hords Creek on the way to my Granddad's farm. It was removed sometime in the early 1980's. He said it was replaced with one of the flat concert ones. I had ask him about the Waldrip Bridge, as I had searched and it looked a lot like this one. He said the Waldrip Bridge would be close to Rockwood and would have probably been out of the way for them to go take a photo.
He said that there was a bank robbery in 1936 and there was a shoot out in that bridge area. Guess that would explain the gun battle story.
Thanks for your information & I will email you in a couple of days for a scan & maybe a couple of questions.
Sandy.