Overview
The Mission Valley League is a high school athletic league that is part of the CIF Southern Section. Member schools are all in the west side of the San Gabriel Valley region of Los Angeles County It was created in 1972 with eight schools: El Monte, Arroyo, Rosemead, Mt. View, Schurr, San Gabriel, Keppel, and Monrovia.
Current members
* Arroyo High School (El Monte, California) - 1972 * El Monte High School - 1972 * Gabrielino High School (San Gabriel, California) - 1996 * Marshall Fundamental Secondary School (Pasadena, California) - 2014 * Mountain View High School (El Monte, California) - 1972 * Rosemead High School - 1972 * South El Monte High School - 1992
Former members
* Cerritos High School (1994 - 1998) * Duarte High School (1972 - 1992) * Mark Keppel High School (Alhambra, California) (1972 - 1992) * Monrovia High School (1972 - 1982) * San Gabriel High School (1972 - 1982) * Schurr High School (Montebello, California) (1972 - 1982)