Here's a 1933 Delmore Brothers recording of "I've Got the Big River Blues"

https://www.youtube.com/watch?v=a03NI7QFME0

The lyrics are almost the same as Doc Watson's DEEP RIVER BLUES:

I'VE GOT THE BIG RIVER BLUES (1933)
(Alton & Rabon Delmore)

Let it rain, let it pour
Let it rain a whole lot more, cause
   I've got the big river blues.

Let it drive, let it fall
Let the waves make a wall, cause
   I've got the big river blues.

Give me back my old boat
I'm gonna sail if it will float, cause
   I've got the big river blues.

I'm goin' back to Mussel Shoals,
Times are better there I'm told, and
   I've got the big river blues.

My old gal's a good old pal,
But she looks like a water fowl, and
   I've got the big river blues.

There's no one to cry for me,
And the fishes have a grand old spree when
   I get the big river blues.

If my boat sinks with me,
I'll go down, don't you see, cause
   I've got the big river blues.

Now I'm going to say goodbye,
And if I sink, let me die, cause
   I've got the big river blues.