[Thejd123]

I realize I'm 15 years or so late, but this post is still the #1 result on Google for anyone searching for the chords to Rice's version of Wreck of the Edmund Fitzgerald.
I used the chords suggested by other users in this thread for a year or more, but only recently sat down for a few hours to figure out the real chord voicings as Tony plays them. They go more like this:

--X---X---X---X------------
--2---3---3---3------------
--2---4---0---2------------
--0---5---0---4------------
--0---0---2---0------------
--X---X---X---X------------

Just before the run, he goes to this version of Am:

--5--
--5--
--5--
--2--
--0--
--X--

The only one I can't quite figure out is what voicing he uses for the Em that comes after that, it seems to be related somehow to the Em you get from moving your standard Dm shape up 2 frets.

Once again, sorry for being just a tiinnyyy bit late to the party, but this will be useful for people who continue to search for these chords via Google.