Alliance Health Center is a 154-bed acute care psychiatric and substance abuse hospital that offers treatment programs for ad ... olescents, adults and senior adults. Our campus is also home to the Crossings, a 60-bed residential treatment facility for adolescents. We are dedicated to serving individuals with acute mental and behavioral health disorders and substance abuse issues. Alliance was originally owned and operated by the Sisters of St. Joseph Hospital as a medical hospital. In 1964, the sisters moved the hospital from downtown Meridian to the present location in Meridian, Mississippi. In 1983, Alliance Health Center began providing the psychiatric and substance abuse treatment services it is known for today. read more