Alwen Water Scheme was constructed for the Corporation of Birkenhead between 1911 and 1921 to provide a water supply and comprises Alwen Reservoir, Dam (nprn 85182) and Filter House (nprn 85183). Various housing is associated with the scheme: a manager's house (nprn 408482), terrace of workers? housing (nprn 85249) and barracks (nprn 85248) for the construction workers.
Water was impounded in Alwen reservoir before being treated and piped some 68km to Birkenhead via a major filtration plant at Shotton.
B.A.Malaws, RCAHMW, 17 November 2008.