Old Bridge High School (formed from combining the former Cedar Ridge and Madison Central High Schools) is a four-year comprehensive public high school that serves students in ninth through twelfth grades from Old Bridge Township in Middlesex County, New Jersey, United States, operating as the lone secondary school of the Old Bridge Township Public Schools. The school is located on County Route 516 in Old Bridge Township, however, it is assigned a Matawan mailing address. The school has been accredited by the Middle States Association of Colleges and Schools Commission on Elementary and Secondary Schools since 1970. Through partnerships with Fairleigh Dickinson University and Middlesex County College, students can take college courses for credit in both high school and college. As of the 2021–22 school year, the school had an enrollment of 2,711 students and 203.0 classroom teachers (on an FTE basis), for a student–teacher ratio of 13.4:1. There were 314 students (11.6% of enrollment) eligible for free lunch and 77 (2.8% of students) eligible for reduced-cost lunch. The school operates from 7:35 A.M. to 2:06 P.M. and runs on a 12-period schedule. History Old Bridge High School opened in September 1994. It was formed from the merger of Cedar Ridge High School and Madison Central High School, which were the two existing public high schools in Old Bridge Township. By the 1980s, the enrollment in the two predecessor schools had been little more than half the combined peak of 4,000 that had been reached in the 1970s. The district estimated that the combination of the two schools into a single facility would save $600,000 per year (equivalent to $ in ) after up-front costs of the merger estimated at $400,000. OBHS was originally set up as a two campus system having an East Campus at the former Cedar Ridge site containing Grades 9 and 10 and a West Campus at the former Madison Central site containing Grades 11 and 12. The entire high school is now located at the former Cedar Ridge High School (East Campus) and Carl Sandburg Middle School Building after an addition was added in 2004. The former Middle School building houses the Grade Nine Center. Dr. James Hickey was hired in 2003 and he oversaw a $26.8 million high school construction project that was completed in September 2005. The school developed a stricter but better learning environment as shown through student achievement and standardized test