Ridgewood High School is a four-year comprehensive public high school in Ridgewood, in Bergen County, New Jersey, United States, serving students in ninth through twelfth grades as the lone secondary school of the Ridgewood Public Schools. Ridgewood High School was created in 1892, with the creation of a formal ninth grade class and a sophomore class was added the following year. A high school building was established in 1895, and the school received formal recognition from the state as an approved high school. The campus includes one central building, which, along with the original gym, was completed in 1919 at a total cost of $285,000. The building features brick walls, a slate roof and other stone features. The building was planned to be opened at an earlier date but it was postponed because of World War I. The building was designed by the noted architectural firm of Tracy and Swartwout, who also designed the Missouri State Capitol building. The newest part of the school, the science wing, was completed in 2001 and contains 15 laboratory classrooms, three computer labs and a new industrial arts center. A new fitness center, gymnasium, and multipurpose room, the Campus Center, were also included in the renovation. Due to their proximity to the Ho-Ho-Kus Brook, the school's fields often flood during heavy rains and spring runoff.