Once upon a time there was a footbridge across Rock Creek that allowed access to the Z. Taney Farm and Neill Avenue. Of course, the Z. Taney Farm (or at least the ruins of the farm) and Neill Avenue are still there, they are just hard to get to now. So, that does not exactly fit the clue. However, it might be part of the dam for McAllister's Mill. Both the dam and the mill are gone, so that would better fit the clue. I think we did this photo not too long ago.