The region of Metta was settled by Yurok since about the 14th century. During the gold rush of 1850, the Yurok were faced with disease and massacres by white settlers. Mettah was established as a post during the summer of 1872 to preserve the peace between the settlers and Indians in the area. The post was located at the Metta Indian village situated below the juncture of Mettah Creek and the Klamath River in Humboldt County. A post office operated at Mettah from 1924 to 1925.
- Durham, David L. (1998). California's Geographic Names: A Gazetteer of Historic and Modern Names of the State. Quill Driver Books. p. 105. ISBN 978-1-884995-14-9.
- U.S. Geological Survey Geographic Names Information System: Mettah
- Mettah, California Military Museum, 2013
- Roberts, Robert B. Encyclopedia of Historic Forts: The Military, Pioneer, and Trading Posts of the United States. New York: Macmillan Publishing Company, 1988, 77.
California Journal of Mines and Geology. 1894. pp. 133–.