Fonds consists of both personal and professional material. The personal material includes notes, poems, receipts, membership cards, newspaper clippings, certificates, and photographs, along with three bound volumes of handwritten notes from McKechnie's McGill University course "Practice of Medicine," dated 1888-1890. The professional material includes event programmes, speeches, certificates, newspaper clippings, and notes. The majority of these pertain to his involvement with McGill University and practice in Nanaimo.

The fonds consists of index cards, engravings, notes, maps, printed material and documents from McKechnie's B.C. Place Names project. The fonds also includes forty engraved prints related to the project, illustrating British explorers or events in the 18th and 19th centuries and a map of Russian discoveries on the Northwest Coast (ca. 1780).