I've posted this before, but never got any answer as to WTF it is. "Hellraiser Room". My first thought was rag catchers, but this is a non-combined storm water drain. Not sewage. So, WTF are these here for?! Generally speaking, this is a collection chamber with 3 too-small-to-explore infalls, and one 6' RCP leading to an outfall into Honey Creek, before it immediately disappears underground into qty4 8' RCPs.
This is part of a 6 drain system, 2 outfalls into the creek, then 4 infalls leading the creek under the Wisconsin State Fair Grounds. The other drains have been partially explored, and are in the DB here: https://uer.ca/loc...ow.asp?locid=33063