Nice find Melissa!
Here is a relatively similar bridge (same year, same maker, same truss type but slightly larger and non-laced endposts).
http://bridgehunter.com/nj/mercer/1100072/ Unfortunately, it is at significant risk of replacement since a tree fell and damaged the portal bracing. The county is using this as an excuse to replace the bridge with a new concrete slab.
Seems as though there are those out there that don't like old things...
Regards,
Art S.
Thanks Art! It was a happy accident