Hi Paul,
Here is a link about the Can Do, aka Grampus. For many years, it was moored in Danvers River between the Kerwood and Beverly/Salem bridges. I never saw it leave the mooring. Before I knew its history, I found it eerie to paddle past. I had a conversation a while back with an older gentleman, who recalls the Blizzard of '78 and the men on the Can Do. He told me the Can Do was sold to someone in the south. This link suggests she is out of commission.
http://www.tugboatinformation.com/tug.cfm?id=3813