Dear Bob:
I learned River Driver from the singing of newfoundland-based Great Big Sea. It is on at least one of their albums, and they ended their recent concert in Portsmouth NH with it. We started singing it, and I got the lyrics as they sing it, from a great big sea lyrics website (I've discarded the url, I'm afraid). It should be easy to find with that info. Your inquiry was the first I've found suggesting its origin. I typed out the lyrics in wordperfect, if you'd like them. Alan.Eaton@unh.edu