Welcome to Elsinore High School for the 2008-09 school year! We are pleased that you are taking the time to visit our school through this site, and we hope that you find what you are looking for. We have much to be proud of at Elsinore High School, and we welcome this opportunity to show ourselves to you. Elsinore High School is the oldest high school in the Lake Elsinore Unified School District and one of the oldest high schools in Riverside County. We’ve been around since 1891, and our EHS family is everywhere..