Hi, Mick -
Here's a YouTube recording of a Dublin recording by Springsteen of "Erie Canal" (low bridge):

https://www.youtube.com/watch?v=l3p6VqOnbIw

It seems to be related to the usual "Low Bridge" melody, but Springsteen has changed it.
I think Springsteen's lyrics are mostly the usual "mule named Sal/Low Bridge" lyrics: @displaysong.cfm?SongID=6231 - but I'm guessing the tune is his own, since I've never heard it before.
-Joe-