I'm trying to hunt down the title/lyrics of a song that i've heard covered by everyone from Lucy Blue Tremblay to Garrison Keillor, but can't locate in the datagbase: The first verse goes something like:

The river is wide I can't cross over and neither have I wings to fly Build (or "give") me a boat that can carry two and both will row my love and I

Anyone know the rest of the song?