The Olympic Class ferries are the newest vessels to the Washington State Ferries (WSF) fleet. The ferries are intended to allow the agency to retire the aging Evergreen State-class ferries currently in service. The ferry design is based on the Issaquah-class ferries which have proven to be the most reliable and versatile in the fleet. The Olympic Class ferries are designed to serve all routes and terminals in the WSF system. All vessels are being built in Washington as required by state law.