Coordinates are 45.18 & 83.25. It's listed
on the ARLHS site (where I got the coordinates from) and is shown on the illustrated map we use. It comes up in a whole bunch of links on both Yahoo and IE, but there is no historical information on any of the links. The coordinates show it between Thunder Bay, MI and MIddle Island, MI.

I just now read the description shown on that illustrated map and it states:

Active Stoneport (1955)--end of landing dock, SE of Presque Isle, West side of Lake Huron; private aid.

Seems strange that an active light, even one that's a private aid, would not have something written about it somewhere, especially since it's referred to by so many links.