The original high school and gym, now used as the Casa Grande City Hall, are listed on the National Register of Historic Places.

The original Casa Grande Union High School was built in 1920–21 at a cost of $135,000.

The large building's construction was a major milestone for the growing town between Phoenix and Tucson.

The adobe was locally made with on-site earth; manufacturing it provided much-needed jobs during the Depression in hard-hit Casa Grande.

[citation needed] Scholastic Open is the highest competing High School drumline division in Arizona.