When I was exploring on my own, the best guess for a location of the old bridge photo was near the Satzinger Mühle, or mill. The mill itself is quite old, even ancient. A bridge had been there for a long time. While the modern bridge is not similar to the one in the old photo, it was my understanding that it had been destroyed in WWII and rebuilt. The buildings were different too, but it was the best I had at the time.
My next step would have been to see if I could get some old photos of the Satzinger Mill and Inn. I will still give it a try, but I think the site near the kindergarden is a better bet.