Pete Seeger has written a few songs about the Hudson River for what it's worth.

I also count The Erie Canal as a river song since the canal functioned as a river and parallels the Mohawk river for most of its length. Low bridge everybody down!

Not that anyone cares, but I spent a couple of summers on archaeological digs along the Mohawk River and beside remnants of the Canal. The incidents I mentioned above took place then. Beautiful country but stuck in a pre-civil rights era, I'm afraid. The decline of the canal seems to have frozen some of the larger towns in time since no new development ensued. It's a haunted sort of place, many of those old boomtowns - not yet ghost towns but they're on their way.