Dave:
Those are the first pictures I have seen of the Black Canyon bridges after the line was abandoned and the route became a narrow road. When where the bridges removed and the road closed for the building of both the Blue Mesa Dam and the dam at Crystal Creek?
The High Line bridge from my observation looks to be a bridge within a bridge with new steel added inside the truss to strengthen it. I noticed that in 2006 when I rode the trip into Tacoma during the NG Convention. sorry no pictures.
Bob Meckley