i looked on some legal sites theyres alot of cases over that issue. but i guess some common sense and theyre summary sum it up. where are you navigating to in a dead end marina its not public domain
WHAT ARE PUBLIC WATERS?
THE "FLOATING LOG" TEST AND KEY DEFINITIONS
It should be emphasized here that the terms "public" and "navigable" are synonymous; likewise are the terms "private" and "non-navigable." This is due to the fact that since 1787, prior to Michigan's admission to the Union, applicable law has stated as "public" all waters that are navigable and, as "private" all waters that are "non-navigable." Accordingly, the legal test used to determine "navigability" is the crux of the matter. The fact that a water is boatable, does not necessarily, in the opinion of the courts, make it navigable.
Public and private rights are controversial issues that have historically been determined by the courts. Michigan courts have repeatedly held that the public has rights in navigable water. These waters have been defined as any water which in its natural state is capable of and has been used for the purposes of commerce, travel and trade by the customary and ordinary modes of navigation. The floating of logs during the lumbering days was held to be an act of commerce. Consequently, any lake or stream used for this purpose would be considered navigable within the meaning of this term. Thus, the log floatation test has largely become the yardstick in Michigan to determine the "navigability" of a waterbody, that is, whether public or private.