Hello fellow Berrien County person.
As Jim said the summer is a much busier. From down here in the Berrien Springs area I have heard quite a bit on the marine frequencies. Most of it is the large freighter type ships "calling" ahead to give warning to the smaller boats that they are inbound and about what arrival time they will be there. Not just into St. Joe either. Some times into Muskegon or several other ports around the south end of the lake. Depends where the sending boat is at the time. Oh and BH / SJ does have a draw bridge. A couple, a normal road one and a swinging rail road bridge. The railroad one gets the most radio traffic since its rather hard to stop a large ship or a loaded train
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I have also heard the Coast Guard quite a bit. Their standerd evening info / hazzard broadcasts. Plus the ocasinal searches. The only thing is the traffic dosent last long. They say what they need to say and thats it so its easy to scan right past it some times.
Hmm had an excel spread sheet of marine frequencies around here some where.
Edit: Found it. At least I think thats it. Due to some computer fun I dont have excel installed at the moment and there for cant open that file. If you want it in another format you will need to give me a few days on that one
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Edit: Again and again and..
Dug the original page I found that at out of my book marks. Here you go.
http://www.navcen.uscg.gov/marcomms/vhf.htm