I have a recording from about 1970 by a female singer in a folk club in Scotland. The words, as far as I've been able to transcribe them are as follows:

I sat on a bridge across the stream
And imagined you stood on the other side,
I told you the thoughts of my summer dream
Of my lonely love and my wounded pride.

And even though I knew you well
I looked a stranger in the eyes
I told you the truth I had to tell
And you showed no anger nor surprise

I turned away from my xxxxx the shame
In a flood of tears I tried to hide
Then a voice called out of a xxxxx
And a child was standing by my side

Gone too soon on a summer day
Dark and cold as a winter moon
And the flood would wash the bridge away   
And I will stand on the bank alone

The tune is lovely, and is my earworm at the moment. Internet searches have found nothing. My feeling is that it's not traditional, so there must be a writer/composer out there somewhere. Does anyone recognise it?