jk - to find an answer to the question at hand, the rights of the owner of Lucky Estates has to be determined.
And, depending on what those rights may be and how issues involving avulsion are determined (apparently it is not settled law), the owner of Lucky Estates my be terribly depressed as they may realize their riparian rights, if in play, may not allow them to access the waterway.
but then, they may keel over from elation since ones rights based upon title to a shoreline actually allow one to claim title to land once underwater but now dry. That little note of “to the shore” or anything similar that would mean their boundary is not necessarily stationary means land gained as the shoreline moves becomes theirs. It has been held that the owner of land beneath a waterway will lose title as it becomes exposed and within the description of the abutting land.