Completed in 1959, Glen Shira phase: pre-stressed gravity Alt-na-Lairige dam (Maples, Ridgway & Partners Ltd) and tunnel to power station on River Fyne. Round-headed buttress dam on Lochan Shira Mor (A. and M. Carmichael Ltd), power station at Sronmor, concrete gravity and earth-fill with concrete core dam (A. and M. carmichael ltd) on Lochan Sron Mor with tunnel to Clachan power station on Loch Fyne. Average annual output: Sron Mor 6 million units; Alt na Lairige 20 million units; Clachan 74 million units.
