May 2, 2023, at age 96, is reported to have been the last known fully fluent speaker. She helped develop dictionaries and textbooks in the language.

Phonology

Phonological inventory of the Columbia-Wenatchi dialect:

Consonants

Nxa?amxcín has 41 consonants, as shown below.

and are "pronounced with tongue blade articluation and resemble and , respectively", although this does not apply for the glottalized affricate .

Vowels

The three vowels in Moses-Columbia are /i/, /a/, /u/.