I checked all of my sources and only found the one reference to "Great Boat Ledge" that names it but dosen't say were it is. I'm betting you already found this reference.
In the process of looking for old Nav Maps of Winni, I did find this cool old map. Has a nice "enlarge" feature. I looked and couldn't find anything designated "Great Boat Ledge". Still a fun old map.
http://shop.oldcharts.net/Lake-Winni...1885-00146.htm
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