Among the more important works may be mentioned the Colchester Reef lighthouse (1885) on a caisson in Lake Erie, the construction and installation in 1898 of the first-order fog siren station on Belle Isle (Newfoundland and Labrador), and the nine flying buttress lighthouses at Pointe-au-Pere, Escarpment Bagot, Estevan Point, Michipicoten Island, Caribou Island, Belle Isle Northeast, Cape Bauld, Cape Norman, and Cape Anguille.

[3][4] Near the end of his career, Anderson designed the visually appealing Point Abino Lighthouse near Fort Erie, Ontario.

He was Chair of the Small Arms Committee of Canada,[6] as well as a Member of Council and Life Governor of the Dominion Rifle Association.

[3] He was founder and editor of the Canadian Militia Gazette, and Chairman of the Geographic Board of Canada, 1911-1913 and 1925-26, being a member from 1898 to 1926.

[3] Colonel William P. Anderson died at home in Ottawa on February 1, 1927, and was survived by his wife, a daughter, and four sons.