The steamer hull in shallow water in Duck Trap Cove is the remains of the Mohawk, which burned in the boathouse in 1906. My brother and I dove on the wreck in the late 60's and recovered a number of items including brass gauges, oil lamps, flag staff, and an anchor. The yacht was owned by Dr. F. E. Greene, and the items were returned to the family of Dr. Greene, who owned Windermere Estate and most of the end of Long Island.
RattlesnakeGal posted a picture of the Mohawk here:
http://s965.photobucket.com/user/Rat...l?t=1303941181
When we dove on the wreck the remains of the small boathouse in the left corner of the picture were still there, although flat on the ground. This was not the Greene's boathouse.