Well, I hear that last line as "You'd better pray it ain't so," but that's no nevermind. Then the song goes on:

Oh, we're muckin' bottom, and here comes ol' Dixie
Singin' who's got that cotton to sell;
Ah, but when she's passin'
We're risin' high on her swell.

We're on the move again.

These two riverboats, racin' up the river,
Then ol' Dixie runs aground
There she stands high and dry,
And we're walkin' right on by
I can see the lights of town
We're gonna roll that cotton down (unclear)

Oh, this ol' riverboat's seen a lot of water
Lot of cotton, you can bet.
You can ask anyone you meet,
And they'll say she can't be beat.
She ain't never been yet.
Can't you hear her whistle blow.
Way up the river we go.

Walkin' up the river we go;
Up and down the river we go.

Walkin' up the river we go;
Up and down the river we go.

The songwriter was Randy Sparks, recorded by the New Christy Minstrels in 1964.