The site of a post-medieval corn mill with a horizontal water wheel. This mill corresponds to "Mullenglonagroo," a lost mill recorded in the Kirk Marown parish place-names (isle-of-man.com/manxnotebook, 1925), with the Manx name "Mwyllin glion ny gro," meaning "mill of glen of the nuts" (i.e., mill in the glen of Glen Croa/Glengroa). It appears on the 1703 Manorial Roll, at which time it was already noted as "lost" in later records, indicating the mill had gone out of use by the 18th century.