Ditto on the "too far to drive" count, at least for me right now.
I was going through closed/abandoned Michigan bridges last night, and noticed that several of them had been posted here with little-to-no data; this had been one of them. It also turned out to be the only one that could even offer a picture without having to scour for one (again, thanks to Google).
As a practical matter, the only girder choices available on the site (to re-categorize this) that aren't concrete girders are deck girder and plate girder, and from what I can tell, this doesn't appear to be either of those, either.
I'd hazard a guess that the county has abandoned it, however, as it disappears from the NBI in 2008.
Only a picture of below will say for sure. Too far for me to drive!
Looks like a lattice girder.
Are those trusses or railings?
Incredible that Google had such a readily-current view available!
Nevermind RE: the "type" issue; this update should suffice.