The Ballad Index also lists "The Wild Rippling Water" from these sources: Austin E. and Alta S. Fife, Cowboy and Western Songs (1969) and Matthew Hodgart, editor. 1965. The Faber Book of Ballads, but given their late dates I'd bet they both got it from the Lomaxes.

I was about to say the title phrase didn't appear in the lyrics, but it does in the Lomax text, not in the Judy Collins text. And it's all there in the DigiTrad, too (speaking of research I should have done): DT #340.