Webster became a Trustee of the Public Archives of Nova Scotia, a Member of the Historic and Monuments Board of Canada, and the Honorary Curator of Fort Beausejour Museum, for which he was responsible. Apart from his writings which remain definitive sources on many subjects, it was with the Historic Sites and Monuments Board of Canada that he perhaps had his most lasting influence. Working with other members of the board, he surveyed the provinces of New Brunswick, Nova Scotia and Prince Edward Island and made recommendations for the commemoration of dozens of sites throughout New Brunswick and Nova Scotia with important historical relevance. Among these were: