Probably the oldest of its type in the U.S. It's long since been closed to vehicles, but the newer bridge paralleling it makes a nice spot for getting those shots of someone standing on a bridge from a vantage point that appears to be hanging in space.
I was more interested in documentation that art when I went to this site, so I didn't wait for perfect light, but this should be plenty for folks to get ideas from.
Just about 300 yards off US377 on CR149 in Bluff Dale. Follow the historical marker signs, and you'll end up either at the bridge or at the old public water pump. If you get to the water pump, go back to 377, turn right, and go to the next historical marker sign. Just across the tracks, you'll see the bridge.
FWIW, the water pump used to be a great location, but now it's in the middle of a truck parking and loading area. It might still be possible to get some good shots there with a lot of creativity, but I didn't see any good opportunities that morning.