The <i>Colsac III</i> has two plaques mounted on one of the stands between two vehicle ramps.  The upper plaque is for the <a href="https://en.wikipedia.org/wiki/National_Register_of_Historic_Places" class="extiw" title="w:National Register of Historic Places">w:National Register of Historic Places</a> listing while the lower plaque is for the Wisconsin Register of Historic Places.
<a href="//commons.wikimedia.org/wiki/User:Slambo" title="User:Slambo">Slambo</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>