Bigelow Road Bridge
Photo taken by Justin A. Levine
License: Creative Commons Attribution-Share-Alike (CC BY-SA)
View this photo at adirondackdailyenterprise.com
BH Photo #484751
This looks to me more like a steel stringer (beam) bridge with a lattice railing. I don't see a way for a load on a center stringer to be carried by the lattice part.