Celticdog said:
The third figure shows the bridge at 65.5', not at the existing grades which are much lower down. If James City County does interpret the third figure as such, then the top of the structure could actually be at elevation 155.5. Bridge elevation of 65.5 plus 90'. That's way above the valley floor.
You are correct the County code for the M-1 zoning district is for anything over 60' above existing/finished grades.
But the structure would not be over top of the bridge, so the existing grade would be the valley floor, or the lowest elevation that is directly below the structure. That's why I believe that we're probably looking at a maximum elevation of around 125-130, since the lowest contour within the area of the structure is close to 35' or 40'. The distance, if I'm interpreting the code correctly, is measured at the point where the distance between the top of the structure and the existing/finished grade directly below is the greatest.