The ecology link seems to say that we can access, by water, all waters. But, it gets fuzzy when the motto, is privately owned. You could float a river, even if the upland owner owned the bottom. But, you couldn't anchor or wade. If they own to OHW you can walk, anchor, use the land below OHW but you can't cross "their" uplands.

We own tidelands but I have been told that we can't stop the public from simply walking across it. They have to legally access it, but they could then walk along it. And, they certainly couldn't dig shellfish there.

As I talk with folks who have worked in land-use and access issues there are some really interesting twists with every state different.