Hi, I only know a little about parts of the ICW, but I expect some others here will be able to assist. Please look at the top of the page and 'click' on the World Cruising and Sailing Wiki, click USA, then look for the search field in the left margin. Type in Atlantic Intracoastal Waterway and there will be a good deal of information which may be of assistance.
Meanwhile welcome to CL and we hope to hear more about your forthcoming trip.
"if at first you don't succeed....Redefine success"!