There is no information on when the Signaller Charles W.D. Mooney Plaque was unveiled at St. Clair United Church. It was erected in his memory by his Aunt Maime.
The church was founded in 1878 as Zion Methodist Church and renamed St. Clair Methodist Church in 1915. It entered the United Church of Canada as St. Clair United Church in 1925 and in 1966 amalgamated with St. Columba United to form St. Matthew's United Church.