Extinct (date missing) | Ethnicity Shasta ISO 639-3 None (mis) | |
New River Shasta is an extinct Shastan language formerly spoken in northern California. It may have had only 300 speakers before contact, and they soon went extinct; the language is attested in only a few short wordlists. Kroeber regarded them as possibly "nearest to the major group in speech, although [...] their tongue as a whole must have been unintelligible to the Shasta proper."
References
New River Shasta language Wikipedia(Text) CC BY-SA