The School was effectively closed in 2013 when it was merged with Ysgol Maes Yr Yrfa and teaching at the Ysgol y Gwendraeth site in Drefach ceased.
This merger eventually led to Ysgol Maes Y Gwendraeth.
There was also a Sixth Form College and the school additionally housed the Garreglwyd Autistic Unit and Annex.
Many staff members lived in or near the valley and were thus naturally immersed in all aspects of the life of the community.
Ysgol Y Gwendraeth earned the 2001-2002 Schools Curriculum Award.