Linda,
 
I found this thread interesting.  My unfinished master's research (mid  
1980s) was on one of the colonial Yorktown wharfs.  Some of my research  
justification was that I was "bridging" my underwater and my terrestrial  
archaeological backgrounds.  While the transportation distance is  significantly 
different, I suspect that the shoreside infrastructure and  construction 
methods are probably similar.  I would also think that it si  almost imperative 
that there has to be some sort of developed  infrastructure on both the 
sending and receiving ends of the ferry  crossing.  I'm inclined to agree with 
Carl that there is probably little  literature out there specifically on ferry 
crossings.  However, if you  expand the research to include wharf/docks etc. 
you might find a little more  information.  Which leads me to suggesting 
inquiries toward the Texas  A&M or East Carolina underwater programs. I 
believe there have been other  students at those institutions (or other underwater 
programs) that have  researched wharves, waterfronts, possibly ferries, or 
similar topics.  
 
Harding