Riverdale High School was established in 1962 as a new secondary school in Jefferson Parish for young women in grades 10 – 12. The outstanding administration, faculty, and staff established RHS as a school of academic excellence. Riverdale became a forerunner of quality education in Jefferson Parish and quickly earned its superior reputation throughout the state. The Lassie was the mascot of the all girl Riverdale High School.
In 1965, Riverdale was racially desegregated resulting in a more diverse, creative and unique student body. Fifteen years later, Riverdale High converted to a co-ed high school in 1980. The Scottish Rebel replaced the Lassie as the Riverdale mascot and has bestowed a great sense of school spirit and pride. In 1986 grades 7 – 9 were added utilizing the middle school campus and in 1988 grade 6 was added. In 1994, Riverdale divided into two separate schools: Riverdale High School and Riverdale Middle School.
1995 brought scheduling changes to the traditional six period day with the introduction of 4 x 4 block scheduling. Riverdale High was the first high school in Jefferson to implement the block schedule. Each change brings Riverdale High a new experience and opportunity to excel. Despite the changes, Riverdale High has maintained the highest standards in pride, tradition, and educational excellence. RHS has created millions of special memories for its nearly 15,000 graduates and continues to be a Jefferson tradition of excellence.