The Alameda County Fire Department protects approximately 461 square miles of Alameda County. The department was formed in 1993 through the consolidation of the Castro Valley Fire Department, Eden Consolidated Fire Department (itself formed through the consolidation of the Ashland, Cherryland and San Lorenzo Village Fire Departments) and the Alameda County Fire Patrol. In 1994 the Alameda County Sheriff's Department Office of Emergency Services Volunteer Fire Department was absorbed by the Alameda County Fire Department becoming the Alameda County Fire Department Reserve program.