Excellent article about the Lough Allen Clay Company on the Dromahair Heritage website, though the schoolboy speculation on the naming of the harbour is not, I think, to be relied upon: the fifth Earl Spencer, twice Lord Lieutenant of Ireland, is I think the source of the name.
h/t COM for the link
Irish waterways history 
Many thanks for the recommendation …also, the schoolboy’s fanciful story now noted :)
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Fáilte. bjg