The way I remember it is:
Oh, beautiful stream, so clear and blue
A radiant dream, we bring to you,
The sky seems to flow, the stream so bright,
With you as you go, reflects the light,
And gay is the song, and gay the song,
You carry along, you bear along,
By shores that you laythe,? that you laythe,?
Shores you laythe to join the sea.
(That word, laythe,? is pretty uncertain)