The site has been extensively altered with a large area of limestone hillside sculpted out to make room for the factory site. Take a look at the Google Earth view of the place:
Gold n' Plump
And in the parking lot right next to where trucks make deliveries I found what I think is the remnant of a cave from the Arcadia Brewery;
It has absolutely nothing to do with brewery caves but the Gold'n Plump company deserves kudos for some really fun ads a few years back. Military Chickens!
Addendum 1 December, 2016. While perusing early Winona newspapers on another matter I found a brief account from 14 February, 1959 that describes the removal of the hill behind the current Arcadia fryer plant. It mentions that the former brewery had caves there so I think my ID of the sad little remnant above is, well, rock solid. T.