Hey Pete, We had the same problem over here in Palm Beach, we had a spot under the Singer Island that they tried to take away, they tried using the sea grass issue... anyway it took 2 years to get the spot back, we kept dealing with the county parks director.
Contact John JMcKnight76 at aol dot com, he worked with Dade County on this same issue.
We also pointed out that we would not be on the ramps in the way of the power boats, and our spot now says any non motorized under 20'.
The good thing was while our access was closed, that's when I started to find out about all the regatta's around the state.
Jerry