The bridge was well documented by the Wisconsin DOT back in the mid 1980s when the state, in conjunction with the Historic American Engineering Reocrd, documented many of the historic bridges in Wisconsin. (Many, sadly, met their demise shortly after the completion of the study, but this beauty still stands proudly!)
There are copies of the Wisconsin DOT reports in many libraries. Next time you come to visit, you should be able to find copies of the DOT reports at the Beaver Dam Library.
I have been doing some research on this bridge as it is very special to me My Granfather built this bridge and I wanted some historical facts to back up my information I already had. I also have many pictures of this bridge as it one of my favorite places to visit when I come for a visit to Wisconsin