what we refer to as the "first cut", across from the state park marina, go about 1/2 mile on your left.
That is where the core had the reciprocal water sign posted. (past tense it fell in an wasn't replaced.)
so if u drew a line from the sign where the wolf meets the big water through 2nd Twin Island, one closet to trooper island, to a about a .5 mile from the 1st cut , is where u are legal w/reciprocal waters,

Id have to think there would be some common sense law enforement for giveness there abouts without good markers