Maybe paint on the dock deck... both where the boats tie up, both sides where it is seen BEFORE they tie up and on the walking surface:
Private Dock
No docking allowed
I dunno... if, legally, you own the dock, then I suppose that it you can rent space, just as if you owned a parking lot.
So, you might consider a sign that says:
Private Dock
$5 / hour
Pay in advance.
Trespassers will be set adrift
It seems like you frequent the dock yourself, so you can put a "collection box" there, properly signed, locked top for collecting.
I'm no lawyer, but if you painted the signs on the dock itself, it is hard to remove. I don't know why you can't set your own price. In Texas, a vehicle on private property can be towed..only hitch is that notice must be clearly visible and proper parking spaces marked, and an attempt made to contact the owner before towing. Might check your state laws regarding parking vehicles on private property.
You don't want to set yourself up for a "destruction of property" problem... or theft issue.
What does TVA say?? Are there laws particular to this problem... you can't be the only one that has it.
The
TVA River Neighbors Newsletter may have something that covers this... current and back issues are available on line, but I haven't gone thru them to see. There is a
TVA Watershead Team that assists property owners with their structures.