This is it Pete

[Sumpter250]

Pete you could use it in the standard configuration of a lenticular truss and suspend the walk way from the lower cord that differentiates a lenticular truss from the parabolic bow with the walk way tied to the uprights in the center,so I've been told. still a nifty looking bridge either way
jim

I saw examples of that, and, while interesting, I still favor the Ft Laramie bridge style. The Eureka Bridge that you posted is still a very tempting alternative. Both it and the Ft Laramie bridge have "technical challenges". Once I figure out how to overcome those, and establish a clear picture of each, as it would appear in the scene, I'll make a final decision.
Many thanks for posting those bridges, any one would be an interesting addition to a scene, and definitely something that hasn't been "overkilled" in model form.