Bisa ga Cibiyar Kula da Gidan Gida ta Kasa, an kammala ginin a 1941.
Tabbas, wani nau'i mai rikitarwa na jumla shine "A cewar National Park Service, an kammala ginin a 1941, duk da haka, William Richard Morton Keast ya ce an kammala ginin kuma ya mallaki ranar 25 ga Nuwamba, 1940. "