Arroyo High School, located in El Monte, California, United States, is a school in the El Monte Union High School District. . The attendance area served by Arroyo High School consists of four different communities: El Monte, Temple City, Arcadia, and an unincorporated area of Los Angeles County. The attendance area of the 40-acre high school is approximately four square miles and is bounded on the north by Live Oak Avenue, on the west by El Monte Avenue and Arden Drive, and on the south by the railroad tracks at Ramona Boulevard. The eastern boundary is formed by going north on Peck Road from Ramona to Lambert Street and east on Lambert to the San Gabriel River.