Welcome to the Rutland-Windsor Supervisory Union, headquartered in Ludlow, Vermont, home of Black River High School, Ludlow Elementary School, Mt. Holly School, and Plymouth School. Nestled in the Green Mountains of Vermont and close to the Okemo and Killington Ski Resorts, RWSU is a small but thriving school district in South Central Vermont. To find the information you need, follow the links at left .