Robert... Yes the little block appeared to be cast iron.
I will also look through my old photos and see if I can find one of these connection assemblies. I will let you know if I find one. Thanks as always for your input.
Hi Nathan:
I knew you had visited a Kingpost, and I was pretty sure this was the one. In truth, I did not know about this bridge prior to that. I commented as I happened to be looking at Jackson County bridges on here this evening.
I don't immediately recognize this type of connection detail. Now that I am aware of it, I will look for it when I am back in the area. The little assembly "block" is not cast iron by any chance is it? I am guessing that the rest of the bridge is either wrought iron or steel.
I am thinking that this one could easily be older than 1909. If the 1909 date is accurate, then this is a rather late example of a pin connected Kingpost.
Thanks, good to know.