My photos from the very early days shows the shop in the same spot HOWEVER, My understanding is that the area facing the Hotel at one time was the demonstration area. This is the area that says Wilderness Road Blacksmith was the front. If you look at the early map, no one would have journeyed down what is now Valley Road since it only led to parking, so there was no need to demonstrate on that side. My earliest snapshot-photo of the blacksmith shop showed cars parked along Valley Road off of Main Street.
As for the bridge, there was a water feature (unsure if it was naturalor artificial) to "turn" the water wheel on the Mill(it does turn, but it powers nothing !) Below was where the run off ended up. I believe the bridge was just an observation area for the overshot water wheel while entering and leaving via the swinging bridge.