It's in the Sam Henry folk song collection, edited by John Moulden
The correct spelling is "Culmore,” on the outskirts of Derry City, N Ireland on Lough Foyle

From memory:

The first time I saw my love, she passed me on by
The next time I saw her, she bade me good-bye
The last time I saw her, she grieved my heart sore
As she sailed down the Foyle
And away from Culmore

Oh, had I the power the storms for to rise
I would make the wind blow,
I would darken the skies
I would make the wind blow and the salt seas to roar
To the day that my darling sailed away from Culmore.

To the far parts of America
I will go my love to see
And I shall know no one, nor no one know me
And If I don't find her,
I'll return here no more,
Like an exile I will wander for the Maid of Culmore.

HTML line breaks added. --JoeClone, 16-Apr-02.