Whose Trash Is It Anyway?

I was out early this morning for my trash walk to Far Beach wearing long pants and a sweatshirt.  JOY! The heat is gone. Watched thunder and lighting and rain last night from my balcony while listening to an old Outlaws version of Ghost Riders in the Sky.  Yippie i ay, yippie i oh. Naturally, after the storm there was new trash that had floated onto the beach.  This Marine Max sign must have floated in from some business selling boats upstream.  It was laying half on the beach and half in the water.  So whose property is it actually on?  Does the shoreline of the Mississippi River belong to the State of Minnesota?  When the shoreline is part of the park does it make it Park and Rec property which means City of Minneapolis?  I don't know.  I collected a bag of junk as usual plus this sign and brought it up to the Park and Rec trash bins.  A trash collector from the City of Minneapolis was there and said I couldn't leave the sign there.  After some discussion he took my sign (after smashing it up) and was off to the incinerator.  I asked him about the stove top down on the beach and he let me know that I can't just drag anything out of the water or I could incur a stiff fine.  (Just how much of a fine are we talking about?)  The stove top was technically not in the water, it's on the beach and the last time I looked for it I couldn't find it. Someone else may have brought it up!  I told him about the big fan thingy I dragged up a few months ago.  I called the city about it originally but after waiting for a week or two I finally broke it into pieces and put it in a trash bin.  It was definitely on park property to begin with so I think I'm safe there.  What about when I pick up trash under the Hennepin Bridge (not park property) and put it in the Park and Rec trash bin.  Ok, not ok?  Isn't it all city property anyway? Today I took a stick and grabbed a Frito bag that was floating in the river.  Clearly in the river, three feet out into the river.  Guilty!