I know this topic is old, but maybe help someone else that was wondering the same thing.
Yes, that little bit of rocks, weeds, and brush that is straight out from the boat launch in kipling is Butler's Island.
The main problem that I saw last year was that it is such shallow water around that island that when the sun comes out or the temperature is a little warm, the ice gets bad very close to the island...
Hope this may help
-Brett-
><)))°>