The Lost River Athletic Conference was a short-lived IHSAA-sanctioned conference in southern Indiana, formed in 1971. Member schools hailed from Clark, Dubois, Martin, Orange, and Washington counties. Membership was never stable in its six-year span, and multiple schools held dual membership in other conferences. 1. * Borden played concurrently in the LRAC and SAC for the 1974-75 season. 2. * Eastern played in the LRAC and SAC concurrently for the 1975-76 and 1976-77 seasons. 3. * Shoals had dual membership in the LRAC and SWIAC for their entire duration in the conference.