Tre-garn Mill is depicted as a working corn mill on the 1st and 2nd editions of the 25-inch O. S. maps, dating from 1883 and 1901. It is named on the 3rd edition map of 1921, but may have ceased working by that date. The 150 metres-long leat which brought water to the mill may once have been an artificial channel from the tail of Llandevaud Mill, 400 metres upstream.
W J Crompton, RCAHMW, 5 May 2011.