September 9, 2020
The location of the wreck was unknown until the summer of 2020 when she was found by two shipwreck hunters from Minnesota, Jerry Eliason and Ken Merryman. A fascinating article from Minnesota Public Radio describes the wreck according to contemporary reports and describes how the PM18 was located.
Only one of the fleet of 20th Century Lake Michigan car ferries is still in operation, the SS Badger out of Ludington, although it no longer carries railroad cars.
The wreck of the Pere Marquette 18 will undoubtedly soon be added to the National Register of Historic Places.
Reference: Minnesota shipwreck hunters locate long-sought Lake Michigan wreck by Andrew Krueger, Minnesota Public Radio.