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Dumbarton grain distillery was part of a gigantic distilling complex built in Dumbarton in 1938 by the famous Canadian distillery company Hiram Walker, makers of Canadian Club, to provide filling for their newly-acquired Ballantine's blend. Hiram Walker's had also bought Miltonduff and Glenburgie for the same purpose, and later acquired Scapa. The complex comprised what was at the time the largest grain distillery in Europe, 'Dumbarton' alongside two still houses that in time produced two different malt whiskies. These were Inverleven and Lomond.
