Riverside High School is a public high school in Painesville Township, Ohio. It is the only high school in the Riverside Local School District (prior to July 2007, the Painesville Township Local School District). The first classes were held in September 1949 and the first class of seniors graduated in 1952. The campus was originally two separate buildings- one for the lower grades, and the second for the upper grades. In the late 1990s, The John J.