Llyn Celyn, Tryweryn Valley, aerial view of the vast earth dam under construction looking west. The construction yard and workers' housing are in the foreground, below the dam. Note on the left the trackbed of the former Bala & Festiniog Railway, closed in 1960 to enable the scheme to proceed, is in use as a construction road and on the right the old valley road, also by now used as a construction road, bisecting Hafod-fadog farmstead and the new, higher route adjacent. Taken11 July 1963.