You will find Uncle Dave's version on 'Go Long Mule' County CO-CD-3505, one of a pair of lovely CDs devoted to Uncle Dave on this label. Uncle Dave's last verse has 'Alligator Mt'.
Rained 40 nights but it rained 40 days
Gonna rain on the Alligator Mountain
Gonna rain for the horse and dominecker(?)mule
Gonna take us on the other side of Jordan
Don't know about 'dominecker'- that's what it sounds like. I dimly recall a word something like that in old-time music, but associated with a hen. Do you know what it is - it will drive me mad now.