I take it you don't want the song that the barbershop quartets sing, but I'm going to post that one since it hasn't been posted at Mudcat.
Gadaffi, can you recall any of the part of the song that talks of a millstream?
-Joe Offer-

Title: Down by the Old Mill Stream
Words and Music: Tell Taylor
Publication information: Chicago: Tell Taylor, c1910

Lyrics

    1.
    My darling I am dreaming of the days gone by,
    When you and I were sweethearts beneath the summer sky;
    Your hair has turned to silver the gold has faded too;
    But still I will remember, where I first met you.
       Chorus:
       Down by the old mill stream where I first met you,
       With your eyes of blue, dressed in gingham too,
       It was there I knew that you loved me true,
       You were sixteen, my village queen, by the old mill stream.
    2.
    The old mill wheel is silent and has fallen down,
    The old oak tree has withered and lies there on the ground;
    While you and I are sweethearts the same as days of yore;
    Although we've been together, forty years and more.
       Chorus:

Source: http://www.lib.duke.edu/music/sheetmusic/am_mem/taylor.htm
Duke University, Historic American Sheet Music Project.

Warren Wilson's "Old Mill Stream" is here (click) - but it isn't your song, either.