Source: BC place name cards, or correspondence to/from BC's Chief Geographer or BC Geographical Names Office
Spelled "Ah-ta Valley" on British Admiralty Chart #A581, 1865. Spelled "Ahta Valley" on July 1896 survey plans of Lots 117-129, and Lots 132-138 (FB 98/97, ph5).
Source: BC place name cards, or correspondence to/from BC's Chief Geographer or BC Geographical Names Office