Mike,
I worked on the design of that bridge several years ago. To add a very little amount of information to what you've written, the research on the history of the bridge indicated, as you've stated, that it was likely moved from another location. In its previous life, it probably served as a railroad bridge, indicated by the fact that the truss is not encumbered by diagonal members across the truss. Very little information was available in any of the historical records we found.
Thanks for your current photos. I'd like to see what it looks like when finished, as I no longer live in the area.
I do not know the exact history of the Revenue Bridge but here is what I do know.
The bridge has been rumored to have been moved in from another location which is very popular practice for the Clackamas County Public Works Department.
I am not sure if the structure started as a through truss somewhere else, but it does have stout cross beams on the bottom chords of the trusses. This leads me to think that your idea is very resonable considering the past practices of Clackamas County.
I have actually been in search of the history of this structure since it should be gone before the end of the year.
Do you think this bridge started life as a through type bridge and later it was recycled and placed here in its present configuration?
Austin,
Once the project is finished I will take some decent photos of the new bridge and post them. Since, I drive over the bridge everyday, I should have ample opportunity. Did you work fo W&H Pacific on the project?